@jarus187 The piston is NOT covering the exhaust during air/gas vacuum/intake, so my question remains, why doesn't gas and air go out the exhaust as well as exhaust goes out creating a vacuum. The 3D model indicates that the piston doesn't go up until the chamber is full, which would logically translate to leakage out the exhaust hole. I'm not saying all of it, but certainly a big bit?
@TheLionRichard This is just a bad animation; the timing is all off. By the time the last bit of exhaust has left the chamber, the piston closes off the valve. A little bit certainly is expelled, but not a big bit. Go to animated engines dot com and look up the 2 stroke.
That "air-gas" mixture also has oil in it too. That's another big difference between 4 and 2 stroke engines; 4 strokes have a seperate crankcase for the oil, whereas in the 2 stroke, you have to mix the oil with the gasoline. This is the real reason why 2 strokes can work in any orientation; oil basically gets everywhere to lube stuff. You can't flip a 4 stroke upside down or you'll screw up the engine...
This design is very flawed. Fuel and air can easily go through the exhaust making the engine be much less efficient. Even with direct injection, the air can still escape, and there would not be enough air and too much CO2 for the gas to burn properly.
is it possible for some fuel/air intake to leak through the exhaust chamber or is there a mechanism to close it while the piston lowers. hope this question makes sense, just curious is all. thanks
actually 2 stroke doesnt make twice as much power as 4 stroke. reasons
1. the piston has resistance coming down from underneath cuz the feul is compressed on the other side.
2. the exhaust port opens almost half way when piston is coming down and pressure is released unlike 4 stroke in which piston is pushed down fully to the BDC.
3. oil contamination in feul makes it less powerfull
4. not all the feul burns.
so not twice as much power as 4 stroke but yes more powerfull then 4 stroke
@faziljaved 1. So you think that 4-stroke has no compression stroke? You were wrong. The 4-stroke engine actually has more resistance for the piston to return up, because of the closed valves. The 1.5 to 3 % of oil does not reduce the power of 2-stroke even marginally. As the engine heats up, the fuel starts to burn more efficiently and the oil has no effect to the burning. All the fuel burns, if you have RIGHT kind of exhaust, which is designed for the wanted rpm-area.
@faziljaved AND the 2-stroke engine runs A lot faster than 4-stroke one, so more power is produced. You better shut your mouth and check your facts before posting, you fool.
@tk10 no fucker you dont know nothing. it is faster cuz every time piston goes up there is power stroke. there are four complete strokes in an engine. 2 stroke does these 4 strokes in 2 strokes. therefore each stroke is not complete. because each stroke is not as complete as in a four stroke a 2 stroke engine does not produce exactly twice as much power as a 4 stroke but a litte less. say 150% as compared to 4 stroke not 200%. i build engines. what do you do you fucker?
I've never seen this before but had the idea, why not have a 4 cylinder engine that's actually a 2 stroker, have 2 pistons firing at the same time = double (if not almost double) the power, and no resistance except compression (no valvetrain, no rockers no springs etc)
@xXxDANMANxXx It would work but good luck getting one to meet pollution standards. They aren't particularly efficient or clean burning and typically only work at 2 speeds, idle and full throttle.
Do you notice how the fuel magically stops and does not go out of the exhaust port?
Some details are not mentioned. Exhaust pipe design is very important to help suck fuel into the cylinder and blow fuel that gets in the exhaust back into the cylinder.
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@cyndie26 I really dont know by that, but there are no reason to use two stroke engine in the car because its made for light vehicles like moped, scooters, lawnmowers etc. But this kind of engines doesent have enough power to motion the 1ton vehicle like a car.
2-strokes are cooler, they smoke, they sound much cooler, and they give more power, as said. ;) but I prefer a 4-stroke in front of a 2-strike because its expensive with gas..
0:29 notice the blue fuel going into the combustion chamber. Then notice the open exhaust hole. Why doesn't the fuel escape through there as it is being drawn in? yes, eventually the piston blocks it, but the fuel moves into the chamber before then?
@Ownage2themax3 The exhaust length and the pipe are tuned so that part of the exiting gasses create a reflective pulse (like an echo) that tends to keep the intake charge contained in the cylinder.
You failed to mention the pollution factor of this type engine. When both ports are opened simultaneously, unburned fuel / air mixture also goes out with the exhaust, which wastes fuel, and pollutes the air. That's why so many of the motocross bikes went to the four stroke engine. If this problem could be remedied, the two stroke would be the king of small engines.
@kiithsjet i know i was joking... well they would if you had another one on the other side... connected with the same shaft... Then it would be cause it goes one way, and ofr one its in and for the other is out.... if u use one piston on bolth sides...
@dude12000 Only applies the to 2stoke petrol cycle. 2 stroke diesels such as those used on large ships (and some old trucks) use scavenge pumps rather than the clever part/mass saving crankcase air pump arrangement. Extra pump does makes for a bulkier/slightly heavier/more complex engine, but the crankcase oil (needed to lubricate the crank) is kept entirely separate from the incoming air. Another benefit is shoot through of intake air to exhaust matters less- inlet air doesn't have fuel in it.
@MisterSea7 There was a few 2 stroke cars. They run in reverse as well. You Could actually Start the car, put it in reverse start backing up, turn the car off, put it in first let off the clutch and compression start the engine to run in reverse. At that Point you would have multiple reverse gears and one forward gear.
@05yammie yes. But again rarely a problem for a 2 stroke diesel. The air fuel mix during diesel injection varies around the cylinder and diesel only need a stoichiometric[ie correct] Air fuel mix near the fuel droplets,. Even under full load the average air fuel mix within the cylinder rarely approaches stoichiometric. Bit of uncleared exhaust gas moves the average AFR in a cylinder a little towards rich. Much the same as exhaust gas recirculation valve, but done within cylinder
@MaxiTheTaxi Yes, it happens in the scavenging process. It's problematic in 2 stroke engines. Often this is overcome with the exhaust system itself; sonic waves from a enhanced exhaust system cause momentary flow backwards during the savaging process.... thus eliminating a lot of your combustion gas lost. This video doesn't get into ported pistons either and their function.
he said it sparks when the piston is at the top of its stroke but thats not exactly true is it? it sparks just before the piston is at the end of its stroke so the air and fuel can circulate more before the piston gets to the top of the cylinder. and aslo because this happens it causes more compression in the cylinder which creates more power
@gpower88 cuz less cylinders the hotter it will get plus people run cars at a condensate speed or rpm 2 strokes can not take that trust me i blew up my dirt bike motor by running it at the same speed to long
@bomberman33311 it does. that is why 2 stroke exhausts have an expansion chamber which reflects the pressure wave back towards the cylinder and pushes the unburned fuel/air mixture back into the cylinder before the exhaust port is closed
in most two strokes ive seen, the piston doesnt actually uncover the intake port. when the air/fuel mixture comes in it goes to the crankcase and when the piston comes down it forces the mixture up over the piston
@charginmahlazors Maybe you can rebuild but I can barely change the oil. Yes, I can see the advantages of 2 stroke for someone into dirt bikes and racing. If I had any problem with my bike, I'd just trade it in for a new one.
Come to think of it, I do like the sound of those little two stroke mopeds with their tinny sound. I have 3 bikes, all 4 strokes though. My Prius has a 4 stroke and a no-stroke engine (electric). LOL
you forgot the most important part of a 2 stroke engine the expansion chamber without that you would have a lawn mower the shape of the exhaust pipe on a 2 stroke feeds raw gas and air mixture via back pressure into the engine to produce a supercharger effect. thats the most misunderstood part of 2 strokes related to the public, why was that not on your video?
since the exhaust port is exposed at the same time that exhaust gas is leaving and fuel is flowing in, doesn't that mean that some of the gas will be volatile enough to escape???
@JSFER2 It is not fuel efficient. The thing is when the air and fuel mixture is sucked into the cylinder, some of it gets out through the exhaust pipe with the exhaust gas. Also, you need to mix oil with the gasoline in order to lubricate, and the oil comes out through the exhaust aswell. That's money thrown in the dumpster. The point is that you should use 2-strokes in machines that need to be light, such as chainsaws and dirtbikes.
Good explanation by Marshal brain! I LOVE TURBINE ENGINE ( JET ENGINE) MORE!! Compared to 2 stroke and 4 stroke engines! In Turbine engines there is no piston, piston rings, spark plug and Crankshaft!! In Jet engines there is only four components COMPRESSOR, COMBUSTOR, TURBINE AND EXHAUST....Which produce 100 thousand Horse power!!!!
and also another question .. what makes the piston drive downwards which in turn is raised up by the air gasolene mixture? is it gravity?or magnetism?
The piston is driven downwards by the explosion of the air and fuel mixture lit by the spark plug. When it reaches the bottom of the rotation where the fuel and air mixture is let back into the chamber, you can see (in this orientation to the far left) the crank is at the end of it's rotation and is going back, pushing the piston back up. It's like when minute hand reaches the 6 on a clock, it has to start rotating back up. Something attached to the end of the minute hand
@Spikejr5342 when u said that " the crank is at the end of its rotation and is going back , pushing the piston back up "now i have a question .. what makes the crank shaft rotate while going up to ignite compressed air and gasolene mixture with the help of spark plug?... is it momentum ? ( i dont think it is momentum because momentum would bee too low to push the piston back up)
would also be moving back up towards the 12 on the clock.
A stroke is the length that the piston travels....so in this case if it starts from the "up" position, the spark plug fires moving the piston down (stroke one), and then at the bottom the crank moves the piston back up to the spark plug, stroke 2.
given that info, a 4 stroke engine actually completes 2 "up-downs" of the piston before the spark plug fires again. [Fires], Down (1), up (2), back down (3), up (4) [Fires]
@RandomConcepts Normal 2 strokes are pretty much not made anymore cept in weed wackers n small tools... But in boats and snomobiles they have either gone to four strokes or Have the new Direct injected 2 strokes in them. In some cases The DI 2 strokes get better fuel economy now than a four stroke does!!
2 stroke diesels are obsolete. Why? They're dirty. Detroits and EMDs have been around since 1938, and they're on their way out. The Detroits are already gone. The EMD 710s will be around for awhile longer, thanks to electornic engine management. But, it's a 4 stroke world from here on out.
2 stroke diesels are NOT obsolete. The worlds largest engine is the Wartsila NSD (Sulzer) RTA96-C, it's a 2 stroke diesel engine mounted on the largest vessels out there, mainly oil tankers. It is one of the most efficient engines also, a 14 cylinder monster able to produce 100,000 HP at only 102 RPM, weighting well over 2000 tons and has big as an office block. Ohh and by the way, it's not a 4 stroke world from here on, it will be an electric world from here on, you'll see.
@SKarmytech actually it won't be an electric world, that hype is being way over sold. (can you say $12,000 battery replacement? The next 30years will be the 2stroke engine in trucks and cars powered by Natural Gas, when compressed and stored in a tank, it becomes CNG. its 90% pollution free,works in diesel or gas, its 130 octane, its 100% American fuel, and its extremely abundant with the largest reserves in the world right here at home, CNGPUMP.com has lots of good info on it.
@ElectroMagnumMan Maybe true, never heard of CNG but i'll do some research on that and because i'm a person that likes to put his facts straight, i won't comment on that also, until i know more about it.
Well battery price is very high today because it's still, lets say, a "new technology" on the massproduction automobile industry, and they also have quite a limited capacity. I also can't comment on that because battery technology in under development, so no1 knows how price will be in future.
Plus, are you sure about the 2 strokes being so widely used in the future? Wouldn't it be better if it was a 4 stroke CNG engine? For even higher efficiency. The apply-to-all idea is, the smaller the engine, the lower the efficiency, this doesn't apply always, but most of the times yes. 2 strokes get their reputation of being efficient on the largest engines in the world, on the other hand smaller 2 strokes have terrible efficiency and fuel economy.
a 250cc 2 stroke is not more powerful than a 450cc 4 stroke. MORE FASTER at producing power yes. So the 2 stroke may be ahead of the 4 stroke at the start of straight race, the 4 stroke will catch up quick. But on a track with many turns, the 2 stroke will power out of a turn faster than the 4 stroke. Just like a 999cc inline vs a 999cc V-twin.
thats brilliant. but i looked at a oleo mac engine fuel doesnt circulate tru sump for some reason its diect to the engine piston and crankshaft is bare its wierd tho. but that engine you have is a good example i use a 30cc in a go kart FF with shimano gearbox its powerfull enough ya cant beat 2 stroke imagine a 4cyl 1litre car as a 2 stroke yad pass a porche out lol :D te engine doesnt need much just piston,piston rod engine block and carbs there easy build.
i'll be having a company interview in Laurin marine co on thursday, i hope this would help me
ef827 4 days ago
@jarus187 The piston is NOT covering the exhaust during air/gas vacuum/intake, so my question remains, why doesn't gas and air go out the exhaust as well as exhaust goes out creating a vacuum. The 3D model indicates that the piston doesn't go up until the chamber is full, which would logically translate to leakage out the exhaust hole. I'm not saying all of it, but certainly a big bit?
TheLionRichard 4 days ago
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jarus187 4 days ago
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@TheLionRichard This is just a bad animation; the timing is all off. By the time the last bit of exhaust has left the chamber, the piston closes off the valve. A little bit certainly is expelled, but not a big bit. Go to animated engines dot com and look up the 2 stroke.
jarus187 4 days ago
That "air-gas" mixture also has oil in it too. That's another big difference between 4 and 2 stroke engines; 4 strokes have a seperate crankcase for the oil, whereas in the 2 stroke, you have to mix the oil with the gasoline. This is the real reason why 2 strokes can work in any orientation; oil basically gets everywhere to lube stuff. You can't flip a 4 stroke upside down or you'll screw up the engine...
jarus187 4 days ago
WOW a howitworks video, that actually is informative and not all BS! kudos to you!
therealjimguy 1 week ago
This design is very flawed. Fuel and air can easily go through the exhaust making the engine be much less efficient. Even with direct injection, the air can still escape, and there would not be enough air and too much CO2 for the gas to burn properly.
Anoush13 1 week ago
@Anoush13 if theyre flawed why are they so popular..
Ralphclayton 1 week ago
This design creates more exhaust smoke, polluting smoke, compared to 4-stroke types...
gengol03 2 weeks ago
Why doesnt the gas and air go out the exhaust hole as well?
TheLionRichard 2 weeks ago
Comment removed
jarus187 4 days ago
A piston that acts like a piston???? LOL
XCrafters 3 weeks ago
what a brilliant design
hondaspeed152 3 weeks ago
just a question on the exhaust.
is it possible for some fuel/air intake to leak through the exhaust chamber or is there a mechanism to close it while the piston lowers. hope this question makes sense, just curious is all. thanks
TheTechController 1 month ago in playlist clutch stuff
@TheTechController yes some intake mixture does leak out the exhaust. Thats why they are not very fuel efficient
NobbysPcHelp 1 month ago
@TheTechController yes its possible and it happens, thats why it uses more fuel then 4 stroke engines.
chinaboiii1314 1 week ago
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You can now watch the explanation on why my engine system is super-efficient by watching the following videos:
1.) Principles That Makes My Engine SUPER-EFFICIENT ( Part 1)
2.) Principles That Makes My Engine SUPER-EFFICIENT ( Part 2)
3.) Principles That Makes My Engine SUPER-EFFICIENT ( Part 3)
died4hislove 2 months ago
wouldnt the compressed gas and air go through the exhaust gap??
MrSqwiggles1 2 months ago
@MrSqwiggles1 Very little ever goes out.
XxENovaxX 2 months ago in playlist How Does It Work
@MrSqwiggles1 a tuned expansion pipe makes an exhaust pulse that counteracts its tendencies to blow fuel out the pipe
mageac 2 months ago
they should have a 2 stroke quad
TastyTortilla 2 months ago
@TastyTortilla banshee,blaster,,warrior there is plenty of of two stroke quads
robnlil0919 2 months ago
@robnlil0919 oh thanks
TastyTortilla 2 months ago
@TastyTortilla they do a banshee
seQueenslander 2 months ago
thanks for uploading. why use a 4 stroke over a 2 stroke for cars then?
AeroplaneWings 2 months ago
they produce 40% more power than a four stroke of equal size.
inflatabledildo 3 months ago
actually 2 stroke doesnt make twice as much power as 4 stroke. reasons
1. the piston has resistance coming down from underneath cuz the feul is compressed on the other side.
2. the exhaust port opens almost half way when piston is coming down and pressure is released unlike 4 stroke in which piston is pushed down fully to the BDC.
3. oil contamination in feul makes it less powerfull
4. not all the feul burns.
so not twice as much power as 4 stroke but yes more powerfull then 4 stroke
faziljaved 3 months ago
@faziljaved 1. So you think that 4-stroke has no compression stroke? You were wrong. The 4-stroke engine actually has more resistance for the piston to return up, because of the closed valves. The 1.5 to 3 % of oil does not reduce the power of 2-stroke even marginally. As the engine heats up, the fuel starts to burn more efficiently and the oil has no effect to the burning. All the fuel burns, if you have RIGHT kind of exhaust, which is designed for the wanted rpm-area.
tk10 2 months ago
@faziljaved AND the 2-stroke engine runs A lot faster than 4-stroke one, so more power is produced. You better shut your mouth and check your facts before posting, you fool.
tk10 2 months ago
@tk10 no fucker you dont know nothing. it is faster cuz every time piston goes up there is power stroke. there are four complete strokes in an engine. 2 stroke does these 4 strokes in 2 strokes. therefore each stroke is not complete. because each stroke is not as complete as in a four stroke a 2 stroke engine does not produce exactly twice as much power as a 4 stroke but a litte less. say 150% as compared to 4 stroke not 200%. i build engines. what do you do you fucker?
faziljaved 2 months ago
Thanks!
Ruplustorie 3 months ago
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You can now watch the explanation on why my engine system is super-efficient by watching the following videos:
1.) Principles That Makes My Engine SUPER-EFFICIENT ( Part 1)
2.) Principles That Makes My Engine SUPER-EFFICIENT ( Part 2)
3.) Principles That Makes My Engine SUPER-EFFICIENT ( Part 3)
died4hislove 3 months ago
a 2 stroke engine doesnt have valves it has intake and exhaust PORTs not Valves dumbass
0602720noeflores 3 months ago
@0602720noeflores i learned something new thank you lol
TheWILLTV 3 months ago
Good explanation.
vichimself69 4 months ago 16
fuck you
mcraze1000 5 months ago
yep, that's right-light and powerful, but you have to add oil to gasoline...
TheDaniel366 5 months ago
Martial Brains?... Loved youre explenation but that name??
Picha0098 5 months ago
when u hear a 2stroke engine u must see what is this bike
7amado0 5 months ago
love guys talking about guys stuff
paulhunter123 5 months ago
I've never seen this before but had the idea, why not have a 4 cylinder engine that's actually a 2 stroker, have 2 pistons firing at the same time = double (if not almost double) the power, and no resistance except compression (no valvetrain, no rockers no springs etc)
xXxDANMANxXx 5 months ago
@xXxDANMANxXx It would work but good luck getting one to meet pollution standards. They aren't particularly efficient or clean burning and typically only work at 2 speeds, idle and full throttle.
masm60 5 months ago
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careyherrera593 6 months ago
i took a weedwacker apart and figured everything he said out myself
motocross19916 6 months ago
@motocross19916 join the club
Chris40679 5 months ago
whats a weedwhacker that sounds messed up to us brits
5bananas1 6 months ago
@5bananas1 A weedwhacker is a nylon string trimmer driven by a gas or electric motor. It's used to trim grass and weeds.
masm60 5 months ago
3 words, Fuck Four Stroke :)
Motorbikemad3 6 months ago
I would like to add: fuck environementalist pussies :)
zyvaXterminator 5 months ago
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abelmoran829 6 months ago
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abelmoran829 6 months ago
fucking driver's test!
ReppinDaNiel 6 months ago
Do you notice how the fuel magically stops and does not go out of the exhaust port?
Some details are not mentioned. Exhaust pipe design is very important to help suck fuel into the cylinder and blow fuel that gets in the exhaust back into the cylinder.
montysimmons 6 months ago
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wwwtotalitaerde 6 months ago
best two cycle engine Rotary.
akakumar89 6 months ago
If youre mixin' gas youre kickin ass fellas
justyoustupid 7 months ago
ring ding ding ding ding
12valvepower1 7 months ago
Is it legal to use a two-stroke engine in a car?
cyndie26 7 months ago
@cyndie26 I don't think so. As long as the car is road legal.
Liberalsuck100 7 months ago
@cyndie26 I really dont know by that, but there are no reason to use two stroke engine in the car because its made for light vehicles like moped, scooters, lawnmowers etc. But this kind of engines doesent have enough power to motion the 1ton vehicle like a car.
grobnikteam 6 months ago
can anyone tell me why my bike sounds shitty?
/watch?v=vYBtX-HeuZs
thewillow95 7 months ago
one problem with this is the uncompressed fuel (blue) leaves through the exahust withought being compressed at 0:49.
Leuel48fan 7 months ago
Very cool, but will it blend?
nbness 7 months ago
2-strokes are cooler, they smoke, they sound much cooler, and they give more power, as said. ;) but I prefer a 4-stroke in front of a 2-strike because its expensive with gas..
SivPerBerit 7 months ago
Two stroke is stupidly dirty ...
doldei 7 months ago
@doldei
so? 2 strokes are better than 4 stroke
Isswanas 7 months ago
thank you for sharing this video,
very good explanation video with animations.
please post more videos like this.
sarikirmizinet 7 months ago
am i right to say that a 2 stroke engine gets its lubrication only from the gas-oil fuel? no oil pan?
spornicu 7 months ago
0:29 notice the blue fuel going into the combustion chamber. Then notice the open exhaust hole. Why doesn't the fuel escape through there as it is being drawn in? yes, eventually the piston blocks it, but the fuel moves into the chamber before then?
Again, why isn't the fuel escaping through there?
Ownage2themax3 7 months ago
@Ownage2themax3 ya some fuel does make its way out the exhaust port, thats why 2 stroke dirt bikes leak a little oil from the exhaust pipe.
SlipknotMetal777 7 months ago
2 strokes FTW! Nothing better then hitting the powerband just right.
2stage90 7 months ago 25
@2stage90 that depends on what kind of vehicle you want
foxlyen 7 months ago
@Ownage2themax3 The exhaust length and the pipe are tuned so that part of the exiting gasses create a reflective pulse (like an echo) that tends to keep the intake charge contained in the cylinder.
jsmaye 7 months ago
You failed to mention the pollution factor of this type engine. When both ports are opened simultaneously, unburned fuel / air mixture also goes out with the exhaust, which wastes fuel, and pollutes the air. That's why so many of the motocross bikes went to the four stroke engine. If this problem could be remedied, the two stroke would be the king of small engines.
jmccullah 8 months ago
@kiithsjet i know i was joking... well they would if you had another one on the other side... connected with the same shaft... Then it would be cause it goes one way, and ofr one its in and for the other is out.... if u use one piston on bolth sides...
averyaccordion 8 months ago
How does a 1 sroke work?
averyaccordion 8 months ago
lol "weed" "wacker"
ItsMrWinters 8 months ago
stupid mormen ads, the stupidest of all religions.
MrToiletface 8 months ago
now i now how a 2 stoke works :P
beretta2211 8 months ago
roy west
2008Sameoldfitup 8 months ago
What about disadvantages? Like burning oil XD
dude12000 8 months ago
@dude12000 Only applies the to 2stoke petrol cycle. 2 stroke diesels such as those used on large ships (and some old trucks) use scavenge pumps rather than the clever part/mass saving crankcase air pump arrangement. Extra pump does makes for a bulkier/slightly heavier/more complex engine, but the crankcase oil (needed to lubricate the crank) is kept entirely separate from the incoming air. Another benefit is shoot through of intake air to exhaust matters less- inlet air doesn't have fuel in it.
steveBB30 8 months ago
four stroke is gay
MrChocomel82 8 months ago
very good vid! simple terminology and easy to understand!
shawnboy87 8 months ago
@MisterSea7 There was a few 2 stroke cars. They run in reverse as well. You Could actually Start the car, put it in reverse start backing up, turn the car off, put it in first let off the clutch and compression start the engine to run in reverse. At that Point you would have multiple reverse gears and one forward gear.
SeigiSama 8 months ago 2
When the piston is fully down, why doesnt the fuel/oil escape with the exhaust gas?
MaxiTheTaxi 8 months ago
@MaxiTheTaxi it does
pagedk 8 months ago
@MaxiTheTaxi there is some that escapes he just doesnt mention it, just like some leftover exhaust still being in the cylinder all the time
05yammie 8 months ago
@05yammie yes. But again rarely a problem for a 2 stroke diesel. The air fuel mix during diesel injection varies around the cylinder and diesel only need a stoichiometric[ie correct] Air fuel mix near the fuel droplets,. Even under full load the average air fuel mix within the cylinder rarely approaches stoichiometric. Bit of uncleared exhaust gas moves the average AFR in a cylinder a little towards rich. Much the same as exhaust gas recirculation valve, but done within cylinder
steveBB30 8 months ago
@MaxiTheTaxi Yes, it happens in the scavenging process. It's problematic in 2 stroke engines. Often this is overcome with the exhaust system itself; sonic waves from a enhanced exhaust system cause momentary flow backwards during the savaging process.... thus eliminating a lot of your combustion gas lost. This video doesn't get into ported pistons either and their function.
Real1shepherd 8 months ago
0:20 A piston that acts like a piston?? wow really?? i never woulda thought!! >.>
Uunster 9 months ago 139
@Uunster haha funny shit
ESQwarrior 8 months ago
@Uunster Taken from context, wow.
alxcsb 7 months ago
the fuel will leak is it?
nws15 9 months ago
easy to understand video ;D
darkshift001 9 months ago
@MisterSea7 pollution. they probably don't have the torque of a 4 stroke and the power isn't as smooth.
jdhf983y4uhu 9 months ago
lol @ piston acts like a piston
loey523 9 months ago
he said it sparks when the piston is at the top of its stroke but thats not exactly true is it? it sparks just before the piston is at the end of its stroke so the air and fuel can circulate more before the piston gets to the top of the cylinder. and aslo because this happens it causes more compression in the cylinder which creates more power
lovekrapp 9 months ago
@bomberman33311 it does...a little bit...thats y they are smokey!!!
DieselDownunder 9 months ago
it the 2stroke is better why they dont put them in cars?
gpower88 9 months ago
@gpower88 they used to in old cars but there not as reliable so they use 4 stroke
kibilibob 9 months ago
@gpower88 To much pollution.
911wasdonebyjews 9 months ago
@gpower88 less reliable.. not too environment friendly
comandercool101 9 months ago
@gpower88 cuz less cylinders the hotter it will get plus people run cars at a condensate speed or rpm 2 strokes can not take that trust me i blew up my dirt bike motor by running it at the same speed to long
dkh100 9 months ago
I remember when how stuff works didn't have advertisements.
psychoninja911 9 months ago
thanks you very much.i dont know english but i understan it.
burgpusht 9 months ago
doesn't the petrol go out through the exhaust valve immediately after the exact stroke........
kitty333k 9 months ago
so...2 stroke engines are more powerful than 4 stroke? i think thats what i heard that guy say
september11wasCool 10 months ago
@september11wasCool 2 stroke engine definitely are more powerful
gnmris890617 10 months ago
@gnmris890617 may be more powerfull but the four stroke has more torque
scrapcrapMandM 10 months ago
@scrapcrapMandM completely opposite actually, two strokes have far superior torque for their displacement.
dizza1993 9 months ago
@september11wasCool twice the power per piston... not for the entire engine.
alwayzAngry 10 months ago
@bomberman33311 it does. that is why 2 stroke exhausts have an expansion chamber which reflects the pressure wave back towards the cylinder and pushes the unburned fuel/air mixture back into the cylinder before the exhaust port is closed
anonymous36594 10 months ago
in most two strokes ive seen, the piston doesnt actually uncover the intake port. when the air/fuel mixture comes in it goes to the crankcase and when the piston comes down it forces the mixture up over the piston
nathanisthetruth 10 months ago
i usually hate ads but that scary movie looks good. oh yeah the 2 stroke....lol. im tryin to get mine to run on compressed air
nathanisthetruth 10 months ago
Gotta love that 2 stroke smell on a summers day.
JonnoThomas 10 months ago 175
velorex trabant wartburg melkus subaru saab dkw
12valvepower1 7 months ago
@JonnoThomas i want a subaru boxer 4 crd
12valvepower1 7 months ago
@JonnoThomas oh yes
paulhunter123 5 months ago
It is easier to learn than in Class
tuananh605b 10 months ago
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KittyaaRobbiaa565 10 months ago 9
exelent thanks
betergigech 11 months ago
What drives the piston to compress the mixture around the spark plug? the intake air mixture? 1:16
Spardeth 11 months ago
@Spardeth
momentum.
but at startup, an electric motor
yaricksgym 11 months ago 4
@Spardeth not 100% what you mean, but centrifugal force drives the piston up.
Agent0range67 11 months ago
thank you!!!
modoyioP 11 months ago
Now I understand a little bit better how it works!
BrothrBob 11 months ago
But alas all this work comes at a price...shorter engine life by far and of course the added smell, noise and smoke of the 2 stroke.
dkw12002 11 months ago
@dkw12002
added smell and noise? Thats the best part!
I agree on engine life, but u can rebuild a 2 stroke 4x for the price of rebuilding a 4 stroke 1x
charginmahlazors 11 months ago
@charginmahlazors Maybe you can rebuild but I can barely change the oil. Yes, I can see the advantages of 2 stroke for someone into dirt bikes and racing. If I had any problem with my bike, I'd just trade it in for a new one.
Come to think of it, I do like the sound of those little two stroke mopeds with their tinny sound. I have 3 bikes, all 4 strokes though. My Prius has a 4 stroke and a no-stroke engine (electric). LOL
dkw12002 11 months ago
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geratmathew 11 months ago
you forgot the most important part of a 2 stroke engine the expansion chamber without that you would have a lawn mower the shape of the exhaust pipe on a 2 stroke feeds raw gas and air mixture via back pressure into the engine to produce a supercharger effect. thats the most misunderstood part of 2 strokes related to the public, why was that not on your video?
freehouseplans 11 months ago
I bet that compressor also acts as a compressor too
Butters681 11 months ago
press 2 for extreme sex
TheMykaldude 11 months ago
short n sweet!!
samin2012 11 months ago
wow that was so simple. i get it now. thank you
thefunkyone247 11 months ago
since the exhaust port is exposed at the same time that exhaust gas is leaving and fuel is flowing in, doesn't that mean that some of the gas will be volatile enough to escape???
GUYANESEGT 11 months ago
@GUYANESEGT Yes it will.
sexydieseltech 11 months ago
@GUYANESEGT thats why they are so oily.
herl01 11 months ago
@GUYANESEGT yes but only minimal amounts of gas escape... its not that much since the piston quicly recovers the outake port.
bikerskierCODer 11 months ago
If this is so efficient, which it seems like it is, why do other things, such as cars, boats, and such not use it? Is it emissions, torque?
JSFER2 1 year ago
@JSFER2 It is not fuel efficient. The thing is when the air and fuel mixture is sucked into the cylinder, some of it gets out through the exhaust pipe with the exhaust gas. Also, you need to mix oil with the gasoline in order to lubricate, and the oil comes out through the exhaust aswell. That's money thrown in the dumpster. The point is that you should use 2-strokes in machines that need to be light, such as chainsaws and dirtbikes.
Lether52 1 year ago
@Lether52 alright thanks.
JSFER2 1 year ago
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ayasadisanyaka 1 year ago
2 cycle's rock
Rarrin9378 1 year ago
two strokes can be a pain in the ass. Plus they can easily overheat. They are very cool but you need money and time.
68thelzeppelin 1 year ago
The Crankshaft Counterweight is at at the wrong side of the Crankshaft.
Giacomandfan86 1 year ago
Good explanation by Marshal brain! I LOVE TURBINE ENGINE ( JET ENGINE) MORE!! Compared to 2 stroke and 4 stroke engines! In Turbine engines there is no piston, piston rings, spark plug and Crankshaft!! In Jet engines there is only four components COMPRESSOR, COMBUSTOR, TURBINE AND EXHAUST....Which produce 100 thousand Horse power!!!!
MrSaqib140 1 year ago
@MrSaqib140 you're ignoring the fuel, cooling, lubrication, and starting systems. There's a reason they call it rocket science!
Though, I happen to agree that they're really cool. You've gotta love the sound of a jet engine.
fatstrathss 1 year ago
and also another question .. what makes the piston drive downwards which in turn is raised up by the air gasolene mixture? is it gravity?or magnetism?
baeronautics 1 year ago
@baeronautics
The piston is driven downwards by the explosion of the air and fuel mixture lit by the spark plug. When it reaches the bottom of the rotation where the fuel and air mixture is let back into the chamber, you can see (in this orientation to the far left) the crank is at the end of it's rotation and is going back, pushing the piston back up. It's like when minute hand reaches the 6 on a clock, it has to start rotating back up. Something attached to the end of the minute hand
Spikejr5342 1 year ago
@Spikejr5342 when u said that " the crank is at the end of its rotation and is going back , pushing the piston back up "now i have a question .. what makes the crank shaft rotate while going up to ignite compressed air and gasolene mixture with the help of spark plug?... is it momentum ? ( i dont think it is momentum because momentum would bee too low to push the piston back up)
baeronautics 1 year ago
@baeronautics Plenty of Momentum stored in the flywheel/magneto/cutter disc.
spentacle 1 year ago
@baeronautics
would also be moving back up towards the 12 on the clock.
A stroke is the length that the piston travels....so in this case if it starts from the "up" position, the spark plug fires moving the piston down (stroke one), and then at the bottom the crank moves the piston back up to the spark plug, stroke 2.
given that info, a 4 stroke engine actually completes 2 "up-downs" of the piston before the spark plug fires again. [Fires], Down (1), up (2), back down (3), up (4) [Fires]
Spikejr5342 1 year ago
@baeronautics
Just for added info....the second set of up-down in a 4 stroke is to let the exhaust valve open up and let the exhaust out.
Spikejr5342 1 year ago
what does 2 stroke mean though?
baeronautics 1 year ago
@baeronautics Takes 2 strokes (up and down) to do intake, compression, ignition and exhaust.
Intake is obviously the intake of the mixture of petrol and air.
Compression is as you can see in the video when the piston moves up and compresses (squeezes) that mixture.
Ignition is the spark plug igniting the mixture, causing the power.
Exhaust being the exhaust gases being let out.
:)
MrJaggedman 1 year ago
the world needs more 2 strokes
pancakewafflebacon 1 year ago
A 250 = 125
250 faster due to wider spread of power
3 hp more than a 125 - for a 250 is NOT that hot!
What makes you think a glorified / over rated 250 thats also an unreliable POS will be faster than a 144?
Your facts based on what?
Anybody that has a ½ a brain and has to pay to race and fix things himself would choose a 2T any day if the AMA allowed them in, and they are in 2010!
4 stokes have killed MX - Less riders than ever before BIG $ to race a 4T with rebuilds on EVERY FKN event
ChrisMX3417 1 year ago
weed wackers :)
3001Orion 1 year ago
wow ty
TheGreekpower94 1 year ago
@TheGreekpower94 greek myths suck lol
baeronautics 1 year ago
I never understood why gas in the cylinder doesn't escape through the exhaust port when the piston recedes.
Chiliplease 1 year ago
@Chiliplease The fuel air mixtures does escape through the exhaust port, this is why 4 strokes theoretically have a superior fuel efficiency.
xero993 1 year ago
@Chiliplease, same here someone explain?
callumskater1 1 year ago
They brake, alot!
SuperDeanLee 1 year ago
four strokes are like tampons...- only pussies have them.
99olo 1 year ago
@RandomConcepts Normal 2 strokes are pretty much not made anymore cept in weed wackers n small tools... But in boats and snomobiles they have either gone to four strokes or Have the new Direct injected 2 strokes in them. In some cases The DI 2 strokes get better fuel economy now than a four stroke does!!
oilerman9406 1 year ago
does any fuel coming from the fuel port escape from the exhaust port while it is being compressed because the exhaust port is higher up?
xllRigerBoyllx 1 year ago
2 stroke diesels are obsolete. Why? They're dirty. Detroits and EMDs have been around since 1938, and they're on their way out. The Detroits are already gone. The EMD 710s will be around for awhile longer, thanks to electornic engine management. But, it's a 4 stroke world from here on out.
DeserTBoB93535 1 year ago
@DeserTBoB93535
2 stroke diesels are NOT obsolete. The worlds largest engine is the Wartsila NSD (Sulzer) RTA96-C, it's a 2 stroke diesel engine mounted on the largest vessels out there, mainly oil tankers. It is one of the most efficient engines also, a 14 cylinder monster able to produce 100,000 HP at only 102 RPM, weighting well over 2000 tons and has big as an office block. Ohh and by the way, it's not a 4 stroke world from here on, it will be an electric world from here on, you'll see.
SKarmytech 11 months ago
@SKarmytech actually it won't be an electric world, that hype is being way over sold. (can you say $12,000 battery replacement? The next 30years will be the 2stroke engine in trucks and cars powered by Natural Gas, when compressed and stored in a tank, it becomes CNG. its 90% pollution free,works in diesel or gas, its 130 octane, its 100% American fuel, and its extremely abundant with the largest reserves in the world right here at home, CNGPUMP.com has lots of good info on it.
ElectroMagnumMan 11 months ago
@ElectroMagnumMan Maybe true, never heard of CNG but i'll do some research on that and because i'm a person that likes to put his facts straight, i won't comment on that also, until i know more about it.
Well battery price is very high today because it's still, lets say, a "new technology" on the massproduction automobile industry, and they also have quite a limited capacity. I also can't comment on that because battery technology in under development, so no1 knows how price will be in future.
SKarmytech 11 months ago
@ElectroMagnumMan
Plus, are you sure about the 2 strokes being so widely used in the future? Wouldn't it be better if it was a 4 stroke CNG engine? For even higher efficiency. The apply-to-all idea is, the smaller the engine, the lower the efficiency, this doesn't apply always, but most of the times yes. 2 strokes get their reputation of being efficient on the largest engines in the world, on the other hand smaller 2 strokes have terrible efficiency and fuel economy.
SKarmytech 11 months ago
@Snailman4 Dont worry i tried it to because i saw it on another vid
MrB14K3 1 year ago
a 250cc 2 stroke is not more powerful than a 450cc 4 stroke. MORE FASTER at producing power yes. So the 2 stroke may be ahead of the 4 stroke at the start of straight race, the 4 stroke will catch up quick. But on a track with many turns, the 2 stroke will power out of a turn faster than the 4 stroke. Just like a 999cc inline vs a 999cc V-twin.
mariojr 1 year ago
Ctrl+W skips advertisements
MrB14K3 1 year ago
thats brilliant. but i looked at a oleo mac engine fuel doesnt circulate tru sump for some reason its diect to the engine piston and crankshaft is bare its wierd tho. but that engine you have is a good example i use a 30cc in a go kart FF with shimano gearbox its powerfull enough ya cant beat 2 stroke imagine a 4cyl 1litre car as a 2 stroke yad pass a porche out lol :D te engine doesnt need much just piston,piston rod engine block and carbs there easy build.
bencrosbie 1 year ago