Disc valve induction such as used on the Kawasaki KH125/AR125 is far better than reed valves, as discs are mechanical controlled and therefore, open and close at exactly the right time, whereas reeds rely solely on the crankcase pressure and thus are less precise. The two-strokes I've driven with disc valves give a better powerband and better fuel economy. We have to thank Walter Kaaden for the disc valve and this basically gave two-strokes a position at the top of the league table.
@SteezySteez2011 Fuck @sangolt88 lol I agree FUCK ELECTRICS! They're not behind in technology at all, the companies just make them as lightweight as possible because most people that get bikes race or do jumps.
Even with GDI Two Stroke engines, the oxygen entering can still leave through the exhaust and not all the excess CO2 leaves through the exhaust. You'll be getting a very unclean burn. Not only does this hurt engine performance, it also is terrible for the environment.
Also, during the down stroke, wouldn't it be harder for the piston to move down, with all that pressurized air blocking it? This is also a major flaw, and hurts engine performance. Plus two strokes burn a lot of engine oil.
@Anoush13 The two-stroke engine only lightly compresses the air beneath the piston, so this doesn't hinder performance. However, a four-stroke engine has oil in the crankcase so this can cause fluid resistance of the crankshaft, therefore hindering performance, so dry sump lubrication then can be advantageous as the oil is kept separately to the engine and pumped to the various parts as and when needed.
I wouldn't swap my four strokes for brand new e-tecs. But that said, four strokes DO have a serious problem. They are all basically car engines turned on end. Car engine coolant is designed for flow in a horizontal position. When turned on end, air pockets form keeping coolant off areas needing cooling, and some areas don't drain, causing salt deposits to form which will eventually fracture the waterjacket pushing it away from the engine.
I love two strokes engines. Can´t undestand why the hell the four strokes are now the choice. The two strokes needs less maintenance and they´re much quicker.
@SonyCrocket Not true, you need to do a lot more to keep up a 2 stroke than a 4 plus they run at higher rpms so they get hotter thus shortening the life. Look at a Honda outboard they need very little upkeep 2 stay running. my dads went 4 17 years b4 it needed a new impeller and he has had nothing go wrong with it other then that. Also you know Honda is reliable because the US military uses them
@bowen1100 They have oil injectors in specific places in the crank. That way it gets only the correct amount of oil exactly where it needs to be. It gets oiled better with like 1/10 the oil usage. Ski-Doo has a good video about it for their e-tec sled.
Type in "Hirth 60hp 2-stroke heavy fuel engine with Orbital FlexDI (air-assisted direct injection)" in Youtube.
Explains the Orbital premix injection system - ideal for 2-strokes. Compressed air/fuel injected directly into the cylinder, computer management can give split second timing & air/fuel mix giving high power & clean emissions. Bottom end lube can be same as a 4-stroke. Have the Revetec camlobe replacing crank - no piston side thrust - Orbital 2-stroke top end - ultimate piston engine
Normal oil bearings like a 4-stroke, using a scavenging blower. Pre-mix Orbital injection system is superb. There is no need for 4-stoke engines today. Lotus have the Omnivore 2-stroke engine. Cylinder head is a piston moved up and down slightly by an electric servo motor to vary the compression ratio. Uses direct injection.
Look at the Ecomotor OPOC, Bill Gate's $ - 2-stroke opposed piston, opposed cylinders. Looks like to be on matrket
4 strokes havew more power and torque and are faster than 2. y? because of the piston movement. the 4 strokes (i dont remember the order)go intake power exost and sumtin else i dont remember. anyways 2 strokes do that in to stokes while four stokes do it in four. witch gives it more power torque and speed also less boggy. 2 stroke get more accel and better on corners, that only when your racing 125 and 250fs. if its 250 vs 250f 250f would win. the yz250f is only 2 pounds heavyr than the kx250!
@MrWinner2160 Wrong, the two stroke delivers a power stroke twice for every time the four stroke delivers one, therefore yeilding more power. The failure of your comparison is most likely because you are not comparing engines of the exact same bore and stroke. Even though you're comparing engines of similar volume the bore and the stroke are what determine power and torque. I am only 16, and I'vebeen working on ICEs for about a decade and nothing in your comment makes logical sense to me.
You better get used to them as they will be the norm. They are vastly superior all around. The weight of a battery set & electric motors to give same range as an ICE is about the same as engine/transmission and FAR simpler and infinitely more reliable. Ina car body designed for electrics, the batteries can be slung low to give a low centre of gravity meaning safer with far superior handling. Motor in wheel hubs means switchable by mcb 4x4.
@NearAbbeyRoad I should've said fuck electric bikes haha, as far as cars and boats and stuff, of I can accept the electrics as being the future. But electric bikes now only get like an hour of ride time (any that I've seen) and they're not even dirtbikes, they're trials bikes. So I'd rather have an engine on my dirt bike so I'm not out in the middle of the desert with a dead battery. If they're gonna make an electric dirt bike, they've got a long way 2 go just to get them to go faster!
@NearAbbeyRoad I'm just saying they've got a hell of a long way to go before the electrics will be even close to as fast as the gas powered with bikes.
that prety wierd, cuz i got a 50cc 4 stroke china bike that smokes light tuned 50cc 2 stroke bikes, and i can do 55kmh up hills, why most standard 50cc 2 strokes ive seen can only do about 30kmh
@zeroc0ol2006 maybe try watching the video at the time zone i high lighted (2:00). The fuel is injected into the cylinder rather than passing through the crank case like it usualy would. Air is too light to carry the oil through the crank case by itself. Making this cycle impossible for lubrication to the crank case. Maybe you should rethink you comment now and maybe make an apolagy.
@zeroc0ol2006 So As you can see from this little lecture i have written, the air needs to move through the crank case in a 2 stroke engine. The 2 stroke engine cannot work in any other way. Fuel cannot be injected, it needs to move through the crank case to carry the oil, as air is too light and would not move it. The 2 stroke engine can only work in the way i have just explained. Stop this argument. Sorry kid but you lost.
@zeroc0ol2006 During the power stroke (when the piston moves down) the piston would first uncover the exhaust port allowing most of the exhaust to leave the engine and then it would uncover the intake port at the very bottom of the cylinder. The pressure in the crank case from the piston moving toward bottom dead center would cause the air/fuel/oil mixer to be pushed through the intake port into the cyclinder. Now the cycle starts over.
@zeroc0ol2006 You obviously have no idea how a 2 stroke engine works... I suggest watching from 0:58 through to 1:25 over and over until you fully understand the cycle and the unique way that the 2 stroke engine works. The vacume of the compression stroke (which is when the piston moves up) draws air/fuel/oil into the crank case, which is when this area is lubricated.
@AlexanderPews no thats were 4 strokes sounds lame, if you hear a 2 stroke dirt bike and a 4 stroke dirt bike, the 4 stroke sounds slow, while the 2 stroke sounds quick and strong.
BUT 4 strokes sounds best on bikes like Honda CB450 than a 2 stroke bike from the 70's and 80's, and theres also some prety cool modern racing bikes with 4 stroke engines that sounds fucking awesome, and not to forget that all choppers and custom bikes have 4 stroke, and they sound frikkin sweet!
@CoolVideoGameVideos Dude a 2 stroke is way faster. Amy 125cc 2 stroke is 30mph faster than my old 125cc 4 stroke and everything is stock and 2 strokes are coming back and my 2 stroke lasted longer and is still running
@phyriz007 i think its probably similar to why they aren't used in cars, which from what i have found is sealing the combustion chamber is hard to seal with out piston rings.
"I wonder why Wankel engins arn't used in boats? There small, and can make some good power and spin to very high rpm"
It operates economically at its constant speed "sweet spot". A very low power/weight ration, "very small", means they are ideal for range extenders in hybrids, where they are rarely used because of the large mains charged battery packs - Audi are R&D them for this use. Can be under the trunk floor or under a rear seat - very smooth and quiet so feasible
using fuel injection system, I prefere one such design, 1st it did not draw the air into the crank case since there's oil in it 2nd it has dry sump as the oil jet is sprayed into the cylinder wall and crank case, 3rd there's no transfer port since being loop scavenging,the air enter the combustion chamber directly when top of the piston reach bottom end. in this way, it eliminate the need of mixing 2 stroke oil and has has greater reliability
just remember, after 10 years of running at wide open and the jugs blow in your 2 stroke, going through countless plugs and unmentionable bottles of oil, my 4 stroke will still be purring like a kitten, not to mention the low end torque in a 4 stroke.
for a tender i think a 2 stroke is better or a small boat, but any thing more than like 10 ft 4 stroke are more reliabul and just are better i think they both have there pros and cons
from my previous comment, there should be a green 2 stroke petrol can run on straight gas as long as the air are not drawn into the crank case, such design may share the design of a 2 stroke diesel since they are lubricated in the same way as 4 stroke engine and can be turbocharged and/or supercharged, uniflow 2 stroke has exhaust valve on the top of cylinder. even small 2 stroke loop scavenged diesel engine use dry sump system without burning its oil in a crank case
2stroke is power house compared to 4stroke on outboards. I know guy with 4stroke 70hp and cant get 17ft boat to plane lol. My smaller 2stroke will whip him
I did like the uniflow design of a 2 stroke engine regardless if it is petrol or diesel, using fuel injector allowing to run on any of fuel. if I'm not mistaken, uniflow 2 stroke petrol engine can run straight on petrol without any problem since the turbocharger or supercharger are used for scavenging, thus not relying the crankcase and improving reliability, uniflow 2 stroke are lubricated in a same way as 4 stroke engine if not mistaken
on 2 stoke model airplane engines, i notice when i run it unburned nitro sprays out the muffler. if you run it rich, as in more fuel than air mixture, a lot of fuel will spray out the muffler, and it will ruin your 70 dollar motor. nitro is 22 dollars per gallon too.
Bottom line is, if 2 strokes are so much better why aren't they more popular? It's like rotaries. I'd say having to add oil to the fuel is a task most people can't be bothered with so manufacturers stay away from anything that needs constant input from the driver.
Like water injection. Simply FABULOUS, you can raise your boost (if you have a supercharged engine), advance the timing, lean the mixture and use lower octane fuel but adding water is a maintenance item so they don't use it.
@WarbabyFox becouse compression of the 4 stroke is hygher then the 2 stroke it burns feul more eficient, i more then once drained the engine oil and was to lazy to bring it to the proper waste facility so i poured it into the gastank the feul mix had to be about 12 liters of gas and 2 liters of oil the bike ran just fine and did not even smoke my brothers 2 stroke yamaha 400cc smokes like hell and only has feulmix 1 50
@WarbabyFox i have 4 motorcycles all 4 stroke for my drivingscool so they get used dayly i change the oil evry year thats 4times 4 liters of oil thats 16 liters of oil a year thats way less then 1 liter a week and also the oil draned from the 4stroke engine gets reused as feul for ocean liners so in fact gets used 2 times i use the old oil to lube the chain and clutchkables and such
@WarbabyFox No no no, you got it all wrong! Two stroke engines need oil in the fuel to lubricate the parts connected (Unless it is a direct fuel injection) therefore creates more pollution from burning the oil. Four stroke engines have the oil in a seperate area from the combustion chamber so the oil is not burned and lost. Because two stroke engines don't use pure lubricant, the vital parts wear down faster. And the fact you have to put oil in the fuel makes it inconvenient.
IM GOING TO LOVE TO SEE THE FACES OF THE PEOPLE WHO ARE GOING TO BE STUCK WITH THOSE FARTING PEICES OF SHIT(4 STROKES) WHEN THE DIRECT INJECTED 2 STROKES COME OUT HAHAHAHAHAHAH THEY WILL DISAPPEAR OVER NIGHT...WELL MAYBE NOT BECAUSE THE 4 STROKES WILL BE SO CHEAP TO BUY
super big marine engines are two stroke and have efficiencies above 50% which is enormous. the prius atkinson engine is only 35% efficient. apparently it can be done well
direct injected 4 stroke engines can be by the way made very efficient and powerful too.. the downside surely is the need for hi-tech electronics, but it's probably quite the same amount of electronics in 2-stroke direct injection. but as said, it depends on the usage
To the guy that said there are no 2 stroke diesels in trucks. Detroit Diesel was a large manufacturer of 2 strokes. They are not turbo charged they are supercharged. You will find them in most older buses lots of 60's and 70's highway tractors and countless off highway equipment. Nick named the "Jimmy" can't mistake the sound.
i dont understand how direct injection is more fuel efficient than a 4 stroke. on a direct injection motor is their some kind of oil sump and just straight gasoline is added? i dont see how burnining a fuel/oil mix would be more efficient. and if it has an oil sump it is not as simple a regular two stroke and would not be as cheap as a simple carbuerated one
@yammyUFC4life BECAUSE THERE IS ONLY 2 STROKES...AND THE DIRECT INJECTION MONITORS THE INTAKE AND OUTPUT OF EXHAUST...DID YOU NOT JUST WATCH THIS VIDEO OR DID YOU JUST START COMMENTING?
@AntBanks2626 yes mr caps man i am well aware of the fact that one power stroke every other stroke will give you more power than the one every four stroke. what i was questioning is if their is some sort of oil sump for the crank and bottom end, or if the injection is a fuel air mix. You obviously did not read my comment right. And what i was trying to get at is if indeed does have an oil sump, it will not be nearly as simple as a stanard two stroke. Far superior obviously, but not as simple.
@cityslicker0014 they have a oil pump just like a four stroke and cylcle oil throught the engine and yes they are as reliable as four strokes. I have a 05 merc 115 two stroke it sips gas and my boat is fast.
I beg to differ 2 strokes are jst as reliable as a 4 stroke if you keep up with your maintance and the cost is less then half the price to rebuild. And for that person who changes his oil once a year must not ride his machine.
two strokes can never be as efficient as 4strokes becase they burn fuel evey stroke insted of every-other stroke. also, the 2stoke emissions are not worse because it has to burn oil and gas. And also 2 strokes not as reliableas 4strokes and they don't last as long. Although they do have a power advantage...
@jammin1033 I have never seen a 2 stroke the is as easy to start as a 4 stroke. The thing is that if the air/fuel mixture is slightly off on a 4 stroke it will still run, maybe with not as much power but it will still run. But in a 2 stroke everything has to be dead on because of the way the engine works, if not it might never even start.
Sorry, but the 4-stroke engine is far more reliable than a 2-stroke. 2-stroke engine oil is expensive. Change oil-once a year or buy 2-stroke engine oil every other tank...hmmmm? In the long run 4-strokes will out last the outdated 2-strokes...PERIOD! Why did it not mention engine life...Who knows...
@schang39 UMMM ACTUALLY THATS NOT TRUE...YOU MUST OWN A FOUR STROKE DONT YOU? THE 2 STROKES USE REGULAR OIL FOR THE CRANK AND ENGINE ...BUT YOU PREMIX THE GAS...A BOTTLE OF ROYAL PURPLE COSTS ABOUT 15 DOLLARS AND IT WILL LAST ME FOUR FULL TANKS!!! NOT EXPENSIVE AT ALL.OH YEAH ROYAL PURPLE IS THE MOST EXPENSIVE ONE COULD BUY SOOOO YOUR JUST SPOUTING NONSENSE....
The same as the carburetor engines, it's just not pre-mixed. In direct injection, you have separate fuel and oil tanks. It injects the oil as both enter the engine.
The guy did not mention it, but there should be a separate lub oil tank, that is connect. to a mech. oil pump that will give drop by drop lub oil into the intake manifold according to the rev and/or load of the engine. This system ( scooters and others use the same system) is very reliable and very economic ( much more than with the pre mix). All other things he said are right, - direct injection will be the future of 2T engines.
give it two years man I have heard a little about to DI bikes. 250 two strokes that make upwards of 100 hp LMAO 4 jokes are fuckin done! companies dont like 2 strokes tho, because 4 strokes cost more to make and the rebuilds are often done by the dealers so they make alot more money of 4 strokes than a two smoke that the guy just rebuilds himself with a wisco piston
ok I'm just learning so if some one could please explain how a direct injection 2 stroke lubricates the cylinder when the fuel is injected directly on top of the piston? Wouldn't that starve the bottom of the cylinder of lubrication?
See my answer to @craigrm85, the only thing I have to add is, that these engines are still "simple" 2 strokers, means they do not have any oil sump and stuff.
Direct injection is (and will be) the very most important development on 2 stroke engines and will give them a new "kick" regarding enviroment and economy.
okay, allow me to explain. In a nut shell, the oil you add to the petrol (2stroke oil) lubricates the upper end of the engine and the engine oil (motor oil ect...) which you put in the bottom of the engine lubricates the gears and everything below the piston.
@jellyking12345 Ya I understand the motor oil lubes the bottom end but in a 2 stroke doesn't your fuel/oil mix lube the wrist pin, and connecting rod bearing? so if the oil's directly injected on the piston head how do they get lubricated? Thanks.
Thats exactly it. On a normal 2 stroke engine, your perfectly right.
But on a fuel injected 2 stroke there is no need for any "2 stroke oil" because only air enters the crankcase. So the sump will lube all the relevant parts under the piston (engine oil).
Think of a fuel injected 2 stroke as a hybrid of a normal 2 stroke and a 4 stroke. Or you could think of it as a supercharged 4 stroke.
@Donnison27 the rings on the piston do all the work ;-D i'm working on a 50cc 2stroke scooters and i know how it works, you need to observate that the miscture here is fuel+air+oil all the time
@Donnison27 it has a regular oilpan and whatever that a four stroke has because instead of having a reed valve and using piston compression like chainsaws it has the direct injection system so yeah
@Donnison27 I guess an oil injector in the intake air would solve that. they did say that the air still goes through the crankcase.. another option would be to just supply oil through lines to the crank bearings and also oil sprayers.
@phyriz007 If the oil was coming through the air intake it would still be burned the same as a standard 2 stroke ,but injected through oil lines directly would be a good solution.
i have a crf230 trail bike 4 stroke and i had a rm250 2 stroke the crf230 4 stroke is running perfect no problems but the 250 blew the top end so if i got a crf450 would it be as reliable as the crf230 trail bike
ha no there not smart guy. A modern 450 is MUCH louder than a 250 two stroke. Why u think the ama starting making noise regulations when all the four strokes came around?
I note one line. 2:10 so they are equal or better than the worst 4 stroke engines. so they can't compete with the average or good 4 strokes or was this just a noncommittal.
I heard what he said. as you quoted many not all or most but many. that could be the bottom 4, 40, 400, or 40,000 etc. the ambiguous nature suggests he couldn't beef up the claim.
right the reason why its not all its design specs a 4 stroke could have a longer "stroke" than an other engine which would increase fuel economy basically hes saying that if the cylinders are built the same (except for the valves) they are better for power and equal for fuel econmy but that only applies to engines which have the same power rating so a 70hp 4 stroke to a direct fuel ejection 2 stroke 70 hp
I'm willing to tentatively accept that as I have no information to disprove it here, but that's not what he said. are you shore that's not your reasoning rather than his?
what he didn't say is there are more factors to fuel economy than just 2 stroke to 4 stroke thats why he said to most and i gave u some of the other factors which would apply
and yes you did. but even then is that removing advantages from the 4 stroke and not improving the 2 stroke? if I remember right the reed valve is one of the limiting factors as it needs time to vent properly for example.
Disc valve induction such as used on the Kawasaki KH125/AR125 is far better than reed valves, as discs are mechanical controlled and therefore, open and close at exactly the right time, whereas reeds rely solely on the crankcase pressure and thus are less precise. The two-strokes I've driven with disc valves give a better powerband and better fuel economy. We have to thank Walter Kaaden for the disc valve and this basically gave two-strokes a position at the top of the league table.
1100HondaCB 5 days ago
@SteezySteez2011 Fuck @sangolt88 lol I agree FUCK ELECTRICS! They're not behind in technology at all, the companies just make them as lightweight as possible because most people that get bikes race or do jumps.
DuggerTRX450R 6 days ago
Even with GDI Two Stroke engines, the oxygen entering can still leave through the exhaust and not all the excess CO2 leaves through the exhaust. You'll be getting a very unclean burn. Not only does this hurt engine performance, it also is terrible for the environment.
Also, during the down stroke, wouldn't it be harder for the piston to move down, with all that pressurized air blocking it? This is also a major flaw, and hurts engine performance. Plus two strokes burn a lot of engine oil.
Anoush13 1 week ago
@Anoush13 The two-stroke engine only lightly compresses the air beneath the piston, so this doesn't hinder performance. However, a four-stroke engine has oil in the crankcase so this can cause fluid resistance of the crankshaft, therefore hindering performance, so dry sump lubrication then can be advantageous as the oil is kept separately to the engine and pumped to the various parts as and when needed.
1100HondaCB 5 days ago
Failed to mention difference in torque curves between 2-cycle and 4-cycle ICEs. 4 > 2.
steelmesh 2 weeks ago
@steelmesh The different torque curves are quite interesting.
1100HondaCB 5 days ago
Eat vmax sho
theanimatorification 1 month ago
are 2 stroke engines convertible to accept propane as fuel
Golph246 1 month ago
Except fourstrokes can become upgraded easier.
hankeybillfred 2 months ago
@hankeybillfred Two-strokes respond amazingly to pulse tuning, which is in itself a specific tuning area for two-strokes.
1100HondaCB 5 days ago
I wouldn't swap my four strokes for brand new e-tecs. But that said, four strokes DO have a serious problem. They are all basically car engines turned on end. Car engine coolant is designed for flow in a horizontal position. When turned on end, air pockets form keeping coolant off areas needing cooling, and some areas don't drain, causing salt deposits to form which will eventually fracture the waterjacket pushing it away from the engine.
thumpdad 3 months ago
A camshaft driven by a camshaft?
ThePCguy13 4 months ago
@ThePCguy13 He said camshaft driven by a crankshaft
ConkersBFDN64 4 months ago
@ThePCguy13 Directly gear driven like the Honda CG125, so no chains, tensioners to worry about.
1100HondaCB 5 days ago
@1100HondaCB ahh cool
ThePCguy13 5 days ago
This could bring the two stroke back to motocross.
KenMacMillan 4 months ago 3
@KenMacMillan hopfully
hempkid4420 3 months ago
I feel like such a nerd liking this video. Not complaining, mind you.
Wartler 5 months ago
I love two strokes engines. Can´t undestand why the hell the four strokes are now the choice. The two strokes needs less maintenance and they´re much quicker.
SonyCrocket 5 months ago
@SonyCrocket for boats and some bike's i can see why 2 strokes would be better but for cars 4 stroke tends to be a lot better.
asshatnowhere159 5 months ago
@SonyCrocket Not true, you need to do a lot more to keep up a 2 stroke than a 4 plus they run at higher rpms so they get hotter thus shortening the life. Look at a Honda outboard they need very little upkeep 2 stay running. my dads went 4 17 years b4 it needed a new impeller and he has had nothing go wrong with it other then that. Also you know Honda is reliable because the US military uses them
bk5593 5 months ago
but with the direct fuel injection, you wouldn't need the 2-stroke oil, so how do the components get lubricated? e.g. crankshaft con rod...
bowen1100 6 months ago
@bowen1100 I have the same question
SonyCrocket 5 months ago
@bowen1100
There is oil, you pour it into a resevoir.
But they use so little oil.
Agip, Honda, and some othe companies sell oil for direct injected 2 strokes, which also works in a regular 2 stroke.
Sismiques 4 months ago
@Sismiques yes but how do the components get lubricated as with regular 2 strokes they are lubricated by the oil being mixed in the fuel
bowen1100 4 months ago
@bowen1100
Apparently it stays in the system longer, where as with old carbeurated ones, the oil is shot out of the exaust much quicker.
Sismiques 4 months ago
@bowen1100 They have oil injectors in specific places in the crank. That way it gets only the correct amount of oil exactly where it needs to be. It gets oiled better with like 1/10 the oil usage. Ski-Doo has a good video about it for their e-tec sled.
TheOfficialKC 2 months ago
Type in "Hirth 60hp 2-stroke heavy fuel engine with Orbital FlexDI (air-assisted direct injection)" in Youtube.
Explains the Orbital premix injection system - ideal for 2-strokes. Compressed air/fuel injected directly into the cylinder, computer management can give split second timing & air/fuel mix giving high power & clean emissions. Bottom end lube can be same as a 4-stroke. Have the Revetec camlobe replacing crank - no piston side thrust - Orbital 2-stroke top end - ultimate piston engine
NearAbbeyRoad 6 months ago
Hey, what year is this video from? Looks like the mid 90s.
Also want low end torque? get a 4-stroke.
Whiteyy191 6 months ago
how is the bottom end lubricated?
guitargod66 6 months ago
@guitargod66
"how is the bottom end lubricated?"
Normal oil bearings like a 4-stroke, using a scavenging blower. Pre-mix Orbital injection system is superb. There is no need for 4-stoke engines today. Lotus have the Omnivore 2-stroke engine. Cylinder head is a piston moved up and down slightly by an electric servo motor to vary the compression ratio. Uses direct injection.
Look at the Ecomotor OPOC, Bill Gate's $ - 2-stroke opposed piston, opposed cylinders. Looks like to be on matrket
NearAbbeyRoad 6 months ago
This has been flagged as spam show
@NearAbbeyRoad this really is a perfect engine
guitargod66 6 months ago
4 strokes havew more power and torque and are faster than 2. y? because of the piston movement. the 4 strokes (i dont remember the order)go intake power exost and sumtin else i dont remember. anyways 2 strokes do that in to stokes while four stokes do it in four. witch gives it more power torque and speed also less boggy. 2 stroke get more accel and better on corners, that only when your racing 125 and 250fs. if its 250 vs 250f 250f would win. the yz250f is only 2 pounds heavyr than the kx250!
MrWinner2160 7 months ago
@MrWinner2160 Wrong, the two stroke delivers a power stroke twice for every time the four stroke delivers one, therefore yeilding more power. The failure of your comparison is most likely because you are not comparing engines of the exact same bore and stroke. Even though you're comparing engines of similar volume the bore and the stroke are what determine power and torque. I am only 16, and I'vebeen working on ICEs for about a decade and nothing in your comment makes logical sense to me.
sleazyentrepreneur 6 months ago
@MrWinner2160 If you have no idea what you are talking about, perhaps you should reconsider posting until you have had a chance to figure it out.
jsmith5153 6 months ago
2 stroke with direct injection is the best cos it is light and you dont need motor oil besides 2 stroke oil and the engine is much lighter!
ThePCguy13 7 months ago
Nice vid. Thnx
cvillarrealb 7 months ago
four stroke is gay
MrChocomel82 8 months ago
should've shown dirtbikes. Seeing as no one here sounds like they give a shit about boats.
SteezySteez2011 9 months ago 3
@SteezySteez2011 Who gives a shit about bikes, they are so far behind in technology, that electrics soon take over anyways.
sangolt88 7 months ago
@sangolt88 everyone in the comments section does, which is why I wrote what I did. Oh yea, and fuck electrics.
SteezySteez2011 7 months ago
@SteezySteez2011
"Oh yea, and fuck electrics."
You better get used to them as they will be the norm. They are vastly superior all around. The weight of a battery set & electric motors to give same range as an ICE is about the same as engine/transmission and FAR simpler and infinitely more reliable. Ina car body designed for electrics, the batteries can be slung low to give a low centre of gravity meaning safer with far superior handling. Motor in wheel hubs means switchable by mcb 4x4.
NearAbbeyRoad 6 months ago
@NearAbbeyRoad I should've said fuck electric bikes haha, as far as cars and boats and stuff, of I can accept the electrics as being the future. But electric bikes now only get like an hour of ride time (any that I've seen) and they're not even dirtbikes, they're trials bikes. So I'd rather have an engine on my dirt bike so I'm not out in the middle of the desert with a dead battery. If they're gonna make an electric dirt bike, they've got a long way 2 go just to get them to go faster!
SteezySteez2011 6 months ago
@SteezySteez2011
BIkes will be electric.
NearAbbeyRoad 6 months ago
@NearAbbeyRoad I'm just saying they've got a hell of a long way to go before the electrics will be even close to as fast as the gas powered with bikes.
SteezySteez2011 6 months ago
that why you add a turbo to your 2 stroke
miasmablk 9 months ago
you, your gal and your Johnson!!!
BrabusTKR 10 months ago 23
that prety wierd, cuz i got a 50cc 4 stroke china bike that smokes light tuned 50cc 2 stroke bikes, and i can do 55kmh up hills, why most standard 50cc 2 strokes ive seen can only do about 30kmh
1PSYTEX1 10 months ago
@1PSYTEX1 lol i think the 2-strokes are restricted
CapitalBoss94 10 months ago
boat engines suck whether they're 2 stroke or 4 stroke lol
alexsuchapimp 11 months ago
@alexsuchapimp lol
Shanthen999 10 months ago
DIRECT FUEL INJECTION in 2 STROKES ENGINES IS PERFECT!
kienyewbeast 11 months ago 53
@kienyewbeast
so true i wish i had that on my dirt bike
89apaul 10 months ago
@kienyewbeast yup cant wait till they are used in dirtbikes 4 strokes suck
hyperpunjabi 2 months ago
expansion pipes
12valvepower1 11 months ago
From time 1:37 the MODERN DIRECT INJECTION 2 stroke motor is shown:
- it lowers the waste and pollution in comparison to classic 2 stroke motor with carburetor
- SEPARATE source of lubrication is needed (since the fuel does not pass through the crank case)
colo97 11 months ago
2:00, a dumb fuck created this or? so how does the crank case area get lubrication?
DangerZONEpixel 1 year ago
@DangerZONEpixel i heard sometimes before about a liquid called oil what some very clever scientists invented^^
zeroc0ol2006 11 months ago
@zeroc0ol2006 maybe try watching the video at the time zone i high lighted (2:00). The fuel is injected into the cylinder rather than passing through the crank case like it usualy would. Air is too light to carry the oil through the crank case by itself. Making this cycle impossible for lubrication to the crank case. Maybe you should rethink you comment now and maybe make an apolagy.
DangerZONEpixel 11 months ago
@DangerZONEpixel Where do you see that the air flows through the crank case?
It only comes from the same direction.
I think that the crank case is a closed system filled with oil.
zeroc0ol2006 11 months ago
@zeroc0ol2006 So As you can see from this little lecture i have written, the air needs to move through the crank case in a 2 stroke engine. The 2 stroke engine cannot work in any other way. Fuel cannot be injected, it needs to move through the crank case to carry the oil, as air is too light and would not move it. The 2 stroke engine can only work in the way i have just explained. Stop this argument. Sorry kid but you lost.
DangerZONEpixel 11 months ago
@zeroc0ol2006 During the power stroke (when the piston moves down) the piston would first uncover the exhaust port allowing most of the exhaust to leave the engine and then it would uncover the intake port at the very bottom of the cylinder. The pressure in the crank case from the piston moving toward bottom dead center would cause the air/fuel/oil mixer to be pushed through the intake port into the cyclinder. Now the cycle starts over.
DangerZONEpixel 11 months ago
@zeroc0ol2006 You obviously have no idea how a 2 stroke engine works... I suggest watching from 0:58 through to 1:25 over and over until you fully understand the cycle and the unique way that the 2 stroke engine works. The vacume of the compression stroke (which is when the piston moves up) draws air/fuel/oil into the crank case, which is when this area is lubricated.
DangerZONEpixel 11 months ago
@zeroc0ol2006 After watching this video again, i heard the narator explaining how they cycle only air through thr crank case, Have a listen 1:49
DangerZONEpixel 11 months ago
very good and simple explanation!
HugoRibeiro1975 1 year ago
2 Stroke all the way!
But you gotta admit that 4 stroke sounds better on dirt bikes ey? ;D
AlexanderPews 1 year ago
@AlexanderPews no thats were 4 strokes sounds lame, if you hear a 2 stroke dirt bike and a 4 stroke dirt bike, the 4 stroke sounds slow, while the 2 stroke sounds quick and strong.
BUT 4 strokes sounds best on bikes like Honda CB450 than a 2 stroke bike from the 70's and 80's, and theres also some prety cool modern racing bikes with 4 stroke engines that sounds fucking awesome, and not to forget that all choppers and custom bikes have 4 stroke, and they sound frikkin sweet!
1PSYTEX1 10 months ago
Comment removed
LosHihhuli 1 year ago
@CoolVideoGameVideos Dude a 2 stroke is way faster. Amy 125cc 2 stroke is 30mph faster than my old 125cc 4 stroke and everything is stock and 2 strokes are coming back and my 2 stroke lasted longer and is still running
ChrisMX3417 1 year ago
Comment removed
LosHihhuli 1 year ago
@ChrisMX3417 -stroke ur lil weiner
HIVisaLIE 1 year ago
@ChrisMX3417 -stroke ur lil weiner --2 strokes if you are really horny
HIVisaLIE 1 year ago
In Vessel(s)..How did you know if the main engine is 4 stroke or 2 stroke?
misxqueen 1 year ago
I wonder why Wankel engins arn't used in boats? There small, and can make some good power and spin to very high rpm..
phyriz007 1 year ago
@phyriz007 i think its probably similar to why they aren't used in cars, which from what i have found is sealing the combustion chamber is hard to seal with out piston rings.
mynamesmitchel 1 year ago
@mynamesmitchel that and some maintenance issues, too. they tend to break down very quickly as they are not designed for high torque operations.
viperxraptor2001 1 year ago
@phyriz007
"I wonder why Wankel engins arn't used in boats? There small, and can make some good power and spin to very high rpm"
It operates economically at its constant speed "sweet spot". A very low power/weight ration, "very small", means they are ideal for range extenders in hybrids, where they are rarely used because of the large mains charged battery packs - Audi are R&D them for this use. Can be under the trunk floor or under a rear seat - very smooth and quiet so feasible
NearAbbeyRoad 6 months ago
4 stroke ftw
blasterowner 1 year ago
using fuel injection system, I prefere one such design, 1st it did not draw the air into the crank case since there's oil in it 2nd it has dry sump as the oil jet is sprayed into the cylinder wall and crank case, 3rd there's no transfer port since being loop scavenging,the air enter the combustion chamber directly when top of the piston reach bottom end. in this way, it eliminate the need of mixing 2 stroke oil and has has greater reliability
josephtan1818 1 year ago
@josephtan1818 such design are similar to that deltahawk aero diesel engine and can be supercharged or turbocharged
josephtan1818 1 year ago
just remember, after 10 years of running at wide open and the jugs blow in your 2 stroke, going through countless plugs and unmentionable bottles of oil, my 4 stroke will still be purring like a kitten, not to mention the low end torque in a 4 stroke.
trainwreck253 1 year ago
@trainwreck253 Not on new DI 2-strokes.
sangolt88 1 year ago
for a tender i think a 2 stroke is better or a small boat, but any thing more than like 10 ft 4 stroke are more reliabul and just are better i think they both have there pros and cons
SuperXmichaelx 1 year ago
Comment removed
Drummerkid461995 1 year ago
so does this eliminate the need for expansion chambers?
offspringfanman96 1 year ago
from my previous comment, there should be a green 2 stroke petrol can run on straight gas as long as the air are not drawn into the crank case, such design may share the design of a 2 stroke diesel since they are lubricated in the same way as 4 stroke engine and can be turbocharged and/or supercharged, uniflow 2 stroke has exhaust valve on the top of cylinder. even small 2 stroke loop scavenged diesel engine use dry sump system without burning its oil in a crank case
josephtan1818 1 year ago
@CoolVideoGameVideos check out the evenrude e-tec 2 strokes in skidoos, then do that lil comparison thingy again.....
bendigocho45 1 year ago
2stroke is power house compared to 4stroke on outboards. I know guy with 4stroke 70hp and cant get 17ft boat to plane lol. My smaller 2stroke will whip him
kiasoul10 1 year ago
The third type of engine does not exist!
See my video:
"Detroit diesel two stroke engine"
Now that's a two stroke diesel engine.
Renwysocki 1 year ago
I did like the uniflow design of a 2 stroke engine regardless if it is petrol or diesel, using fuel injector allowing to run on any of fuel. if I'm not mistaken, uniflow 2 stroke petrol engine can run straight on petrol without any problem since the turbocharger or supercharger are used for scavenging, thus not relying the crankcase and improving reliability, uniflow 2 stroke are lubricated in a same way as 4 stroke engine if not mistaken
josephtan1818 1 year ago
excellent video
julianbell90 1 year ago
@suckseggs ya kinda if u live near ppl who dont like loud dirt bikes and call the cops
2005yamahattr125l 1 year ago
has any one ever made a 2 stroke v8? i think that would be pretty tight. it would prolly sound like a chainsaw on roids lol
asshatnowhere159 1 year ago
The only problem is 2 strokes r way louder
2005yamahattr125l 1 year ago
@2005yamahattr125l thats a bad thing? lol
suckseggs 1 year ago
on 2 stoke model airplane engines, i notice when i run it unburned nitro sprays out the muffler. if you run it rich, as in more fuel than air mixture, a lot of fuel will spray out the muffler, and it will ruin your 70 dollar motor. nitro is 22 dollars per gallon too.
mrfourtysevenman 1 year ago
Bottom line is, if 2 strokes are so much better why aren't they more popular? It's like rotaries. I'd say having to add oil to the fuel is a task most people can't be bothered with so manufacturers stay away from anything that needs constant input from the driver.
Like water injection. Simply FABULOUS, you can raise your boost (if you have a supercharged engine), advance the timing, lean the mixture and use lower octane fuel but adding water is a maintenance item so they don't use it.
warren52nz 1 year ago
i want to invent a gasoline compression engine with a titanium block ;)
jammin1033 1 year ago
@jammin1033
they use them in the F1
215alessio 1 year ago
@215alessio umm i don't think so... give a link with fact then i might believe it
jammin1033 1 year ago
@jammin1033
I have a link of a 2 stroke detroid Diesel
this one was used for Tucks, but the principal is the same as cruiser ship engines
Notice also the feeding Roots blower
/watch?v=25xolzhg3lo&feature=related
215alessio 1 year ago
@jammin1033 2 stroke container ship engine, this one doesn't fit in a garage :)
/watch?v=7JpIdkehdD0&feature=related
215alessio 1 year ago
can anybody answer this question for me please.
Why are we watching the mighty 2 stroke engine die and become outlawed by governments all over the world when this fuel injected model exists?
I someone started making motorbike and mopeds with this engine in then we could then keep this beautiful engine from becoming a distant memory.
jellyking12345 1 year ago
4 stroke is better
gnrdmjfan247 1 year ago
no way dudeeeee
jellyking12345 1 year ago
@WarbabyFox becouse compression of the 4 stroke is hygher then the 2 stroke it burns feul more eficient, i more then once drained the engine oil and was to lazy to bring it to the proper waste facility so i poured it into the gastank the feul mix had to be about 12 liters of gas and 2 liters of oil the bike ran just fine and did not even smoke my brothers 2 stroke yamaha 400cc smokes like hell and only has feulmix 1 50
toecuttergpx 1 year ago
@WarbabyFox i have 4 motorcycles all 4 stroke for my drivingscool so they get used dayly i change the oil evry year thats 4times 4 liters of oil thats 16 liters of oil a year thats way less then 1 liter a week and also the oil draned from the 4stroke engine gets reused as feul for ocean liners so in fact gets used 2 times i use the old oil to lube the chain and clutchkables and such
toecuttergpx 1 year ago
@WarbabyFox No no no, you got it all wrong! Two stroke engines need oil in the fuel to lubricate the parts connected (Unless it is a direct fuel injection) therefore creates more pollution from burning the oil. Four stroke engines have the oil in a seperate area from the combustion chamber so the oil is not burned and lost. Because two stroke engines don't use pure lubricant, the vital parts wear down faster. And the fact you have to put oil in the fuel makes it inconvenient.
legox50 1 year ago
isnt this pretty much a diesel?
yammyUFC4life 1 year ago
IM GOING TO LOVE TO SEE THE FACES OF THE PEOPLE WHO ARE GOING TO BE STUCK WITH THOSE FARTING PEICES OF SHIT(4 STROKES) WHEN THE DIRECT INJECTED 2 STROKES COME OUT HAHAHAHAHAHAH THEY WILL DISAPPEAR OVER NIGHT...WELL MAYBE NOT BECAUSE THE 4 STROKES WILL BE SO CHEAP TO BUY
AntBanks2626 1 year ago
4 stroke engines are more economical,pollute less,are more quiet and will last more.But 2 stroke engines are way more powerful
MDIVISIONRULES 1 year ago
super big marine engines are two stroke and have efficiencies above 50% which is enormous. the prius atkinson engine is only 35% efficient. apparently it can be done well
DanFrederiksen 1 year ago
direct injected 4 stroke engines can be by the way made very efficient and powerful too.. the downside surely is the need for hi-tech electronics, but it's probably quite the same amount of electronics in 2-stroke direct injection. but as said, it depends on the usage
moptim 1 year ago
To the guy that said there are no 2 stroke diesels in trucks. Detroit Diesel was a large manufacturer of 2 strokes. They are not turbo charged they are supercharged. You will find them in most older buses lots of 60's and 70's highway tractors and countless off highway equipment. Nick named the "Jimmy" can't mistake the sound.
sporty8288 1 year ago
i dont understand how direct injection is more fuel efficient than a 4 stroke. on a direct injection motor is their some kind of oil sump and just straight gasoline is added? i dont see how burnining a fuel/oil mix would be more efficient. and if it has an oil sump it is not as simple a regular two stroke and would not be as cheap as a simple carbuerated one
yammyUFC4life 1 year ago
@yammyUFC4life BECAUSE THERE IS ONLY 2 STROKES...AND THE DIRECT INJECTION MONITORS THE INTAKE AND OUTPUT OF EXHAUST...DID YOU NOT JUST WATCH THIS VIDEO OR DID YOU JUST START COMMENTING?
AntBanks2626 1 year ago
@AntBanks2626 yes mr caps man i am well aware of the fact that one power stroke every other stroke will give you more power than the one every four stroke. what i was questioning is if their is some sort of oil sump for the crank and bottom end, or if the injection is a fuel air mix. You obviously did not read my comment right. And what i was trying to get at is if indeed does have an oil sump, it will not be nearly as simple as a stanard two stroke. Far superior obviously, but not as simple.
yammyUFC4life 1 year ago
How does the direct injection keep the bottom side of the rings lubricated? Do they last as long and are they as reliable as a 4-stoke?
cityslicker0014 1 year ago
@cityslicker0014 they have a oil pump just like a four stroke and cylcle oil throught the engine and yes they are as reliable as four strokes. I have a 05 merc 115 two stroke it sips gas and my boat is fast.
FloridaSnookHunter 1 year ago
Hey, that's one of the videos I saw in college.
Airforce1Gunny 1 year ago
I beg to differ 2 strokes are jst as reliable as a 4 stroke if you keep up with your maintance and the cost is less then half the price to rebuild. And for that person who changes his oil once a year must not ride his machine.
etrones 1 year ago
two strokes can never be as efficient as 4strokes becase they burn fuel evey stroke insted of every-other stroke. also, the 2stoke emissions are not worse because it has to burn oil and gas. And also 2 strokes not as reliableas 4strokes and they don't last as long. Although they do have a power advantage...
bigdogsdog 1 year ago
@bigdogsdog lmao? 2 stroke not as reliable as a 4 stroke? u kidding me? a 2 stroke outboard is far more reliable than a 4stroke..
jammin1033 1 year ago
@jammin1033 I have never seen a 2 stroke the is as easy to start as a 4 stroke. The thing is that if the air/fuel mixture is slightly off on a 4 stroke it will still run, maybe with not as much power but it will still run. But in a 2 stroke everything has to be dead on because of the way the engine works, if not it might never even start.
bigdogsdog 1 year ago
how to speed up motor with 2stroke
plsssss reply me...
list all 2stoke that can speed very fast...
plssss=)
AifieEzz 1 year ago
Sorry, but the 4-stroke engine is far more reliable than a 2-stroke. 2-stroke engine oil is expensive. Change oil-once a year or buy 2-stroke engine oil every other tank...hmmmm? In the long run 4-strokes will out last the outdated 2-strokes...PERIOD! Why did it not mention engine life...Who knows...
schang39 1 year ago
@schang39 UMMM ACTUALLY THATS NOT TRUE...YOU MUST OWN A FOUR STROKE DONT YOU? THE 2 STROKES USE REGULAR OIL FOR THE CRANK AND ENGINE ...BUT YOU PREMIX THE GAS...A BOTTLE OF ROYAL PURPLE COSTS ABOUT 15 DOLLARS AND IT WILL LAST ME FOUR FULL TANKS!!! NOT EXPENSIVE AT ALL.OH YEAH ROYAL PURPLE IS THE MOST EXPENSIVE ONE COULD BUY SOOOO YOUR JUST SPOUTING NONSENSE....
AntBanks2626 1 year ago
in the direct injection 2strokes, what lubricates most the piston and crank?? air lmfaoo o.j ;).. but serously i would like to know thanks :D
craigrm85 1 year ago
The same as the carburetor engines, it's just not pre-mixed. In direct injection, you have separate fuel and oil tanks. It injects the oil as both enter the engine.
lukedoc12345 1 year ago
@craigrm85
The guy did not mention it, but there should be a separate lub oil tank, that is connect. to a mech. oil pump that will give drop by drop lub oil into the intake manifold according to the rev and/or load of the engine. This system ( scooters and others use the same system) is very reliable and very economic ( much more than with the pre mix). All other things he said are right, - direct injection will be the future of 2T engines.
XELA2T 1 year ago
Why don't they do that to 2 stroke dirt bikes then?
Bombskillet44 1 year ago 12
@Bombskillet44
give it two years man I have heard a little about to DI bikes. 250 two strokes that make upwards of 100 hp LMAO 4 jokes are fuckin done! companies dont like 2 strokes tho, because 4 strokes cost more to make and the rebuilds are often done by the dealers so they make alot more money of 4 strokes than a two smoke that the guy just rebuilds himself with a wisco piston
jiggyboy69 1 year ago
@Bombskillet44
To keep the 2 stroke as simple as it is.
More complicity=Higher chances of problems in the engine.
harelrule 1 year ago
@harelrule i still wouldnt mind having one anyways
Bombskillet44 1 year ago
bombardier and omc dominate!
xXHUNTERXxXx 1 year ago
2 strokes are way better!
thats why they use them in pro supercross races now a days lol
4 strokes are better
vryryv 1 year ago
ok I'm just learning so if some one could please explain how a direct injection 2 stroke lubricates the cylinder when the fuel is injected directly on top of the piston? Wouldn't that starve the bottom of the cylinder of lubrication?
Donnison27 1 year ago 17
Good question
ismasamov55 1 year ago
DI 2-strokes have separate pressure lubrification system, just like 4-strokes.
vooteleaer 1 year ago
@Donnison27
See my answer to @craigrm85, the only thing I have to add is, that these engines are still "simple" 2 strokers, means they do not have any oil sump and stuff.
Direct injection is (and will be) the very most important development on 2 stroke engines and will give them a new "kick" regarding enviroment and economy.
XELA2T 1 year ago
okay, allow me to explain. In a nut shell, the oil you add to the petrol (2stroke oil) lubricates the upper end of the engine and the engine oil (motor oil ect...) which you put in the bottom of the engine lubricates the gears and everything below the piston.
jellyking12345 1 year ago
@jellyking12345 Ya I understand the motor oil lubes the bottom end but in a 2 stroke doesn't your fuel/oil mix lube the wrist pin, and connecting rod bearing? so if the oil's directly injected on the piston head how do they get lubricated? Thanks.
Donnison27 1 year ago
Thats exactly it. On a normal 2 stroke engine, your perfectly right.
But on a fuel injected 2 stroke there is no need for any "2 stroke oil" because only air enters the crankcase. So the sump will lube all the relevant parts under the piston (engine oil).
Think of a fuel injected 2 stroke as a hybrid of a normal 2 stroke and a 4 stroke. Or you could think of it as a supercharged 4 stroke.
jellyking12345 1 year ago
@jellyking12345
they use such motors on cruiser ships if I'm not wrong
The fuel injected is heavy diesel for those. And they have also gigantic roots blowers as air chargers
But as you say it could also be possible to use this system as moped engines with no oily exhaust
215alessio 1 year ago
so why arent people putting this in all their 2 stroke gadgets
jellyking12345 1 year ago
@jellyking12345 patents and technology licensing issues
origGoof 1 year ago
@Donnison27 Multi-point, targeted oiling
jammin1033 1 year ago
@Donnison27 The oil in the fuel does not lube the bottom end of the motor. There is a constant supply of oil in the bottom end.
ebbingauto 1 year ago
@Donnison27 the rings on the piston do all the work ;-D i'm working on a 50cc 2stroke scooters and i know how it works, you need to observate that the miscture here is fuel+air+oil all the time
teammattibaocamaiore 1 year ago
@Donnison27 it has a regular oilpan and whatever that a four stroke has because instead of having a reed valve and using piston compression like chainsaws it has the direct injection system so yeah
arbutusbmx 1 year ago
The third scheme makes no sense, does not exist.
See my video, "detroit diesel two stroke engine"
Renwysocki 1 year ago
@Donnison27 piston ring blowby lets the oil lube the whole thing buy a 2, way better engine
TheHondaAbuser 1 year ago
@Donnison27 a simple oil pump
bendigocho45 1 year ago
@Donnison27 great question, i have a seadoo with F-injection and wounder how it lubricates the piston
fuji2failo 1 year ago
@Donnison27 I guess an oil injector in the intake air would solve that. they did say that the air still goes through the crankcase.. another option would be to just supply oil through lines to the crank bearings and also oil sprayers.
phyriz007 1 year ago
@phyriz007 If the oil was coming through the air intake it would still be burned the same as a standard 2 stroke ,but injected through oil lines directly would be a good solution.
Donnison27 1 year ago
@Donnison27 On etecs there are small ports in the cylinder wall that dumps small spurts of oil in at the correct time.
Motorfordtoyota 1 year ago
@Donnison27 They inject oil at various points directly to the parts/bearings.
mynamesmitchel 1 year ago
4 stroke will last alot longer
nichshnn 1 year ago
i have a crf230 trail bike 4 stroke and i had a rm250 2 stroke the crf230 4 stroke is running perfect no problems but the 250 blew the top end so if i got a crf450 would it be as reliable as the crf230 trail bike
RECKLESSRENEGADES 1 year ago
nice single stroke innovation there.
insanekoolness2 2 years ago
2 Strokes are much more noisier than a 4 Strokes.
spmok4 2 years ago
@spmok4 i got a 9.9hp 2 stroke it makes more nois then 4 stroke and they need more gas
ikweetffgeennaam 2 years ago
anybody that has ever been near both would know that, you noob.
worldskater31 2 years ago
ha no there not smart guy. A modern 450 is MUCH louder than a 250 two stroke. Why u think the ama starting making noise regulations when all the four strokes came around?
JinxKid9000 2 years ago
@spmok4 defends?
OfficialCrossClub 1 year ago
aguante el yamaha 40 hp 2T XWTL out board!!!!!!!
hernanyeah 2 years ago
I note one line. 2:10 so they are equal or better than the worst 4 stroke engines. so they can't compete with the average or good 4 strokes or was this just a noncommittal.
DonHoraldo 2 years ago
he said when compared to many 4 strokes r u dumb lol
mikemike390 2 years ago
I heard what he said. as you quoted many not all or most but many. that could be the bottom 4, 40, 400, or 40,000 etc. the ambiguous nature suggests he couldn't beef up the claim.
DonHoraldo 2 years ago
right the reason why its not all its design specs a 4 stroke could have a longer "stroke" than an other engine which would increase fuel economy basically hes saying that if the cylinders are built the same (except for the valves) they are better for power and equal for fuel econmy but that only applies to engines which have the same power rating so a 70hp 4 stroke to a direct fuel ejection 2 stroke 70 hp
mikemike390 2 years ago
I'm willing to tentatively accept that as I have no information to disprove it here, but that's not what he said. are you shore that's not your reasoning rather than his?
DonHoraldo 2 years ago
what he didn't say is there are more factors to fuel economy than just 2 stroke to 4 stroke thats why he said to most and i gave u some of the other factors which would apply
mikemike390 2 years ago
and yes you did. but even then is that removing advantages from the 4 stroke and not improving the 2 stroke? if I remember right the reed valve is one of the limiting factors as it needs time to vent properly for example.
DonHoraldo 2 years ago
@DonHoraldo he was talking about direct injectoin not scavengers
jdirtbiker1 2 years ago
and who was talking about scavengers?
DonHoraldo 2 years ago