valeratj if you think your peace of shit jap car is fast or reliable i will race u with my slowest car and it 23 year old v6 buick and every thing in the engine has never been touched asides for valve springs .
valeratj vtec locks a third cam follower (rocker arm)onto the other two rocker arms allowing the third rocker arm to ride on a more aggersive cam lobe lol you have no clue do you
I think- the ultimate goal is the camless engine. Imagine a solenoid on each valve..software could decide how each valve will move down to the microsecond. Some could stay open to avoid compression losses at idle or cruising.. instant response, always the best possible lift/timing/duration no matter what the rpm or load. That will be the peak of the combustion engine. Until we can do it electrically with software, we'll see all kinds of mechanical contraptions to try and get closer.
it would actually simplify the valvetrain and be LESS to work on. Think of all the parts: The timing gears, timing chain, cam, cam bearings, lifters, pushrods, rocker arms, valve springs. On a V8 that's close to 100 moving parts that will no longer be needed. Just a few clicks of a mouse could change the entire character and tourqe curve of an engine. If an actuator goes bad just swap it out, 2 bolts and a plug.
fauket i not sure but but i though i vtec not only retards the cam but also changes its lift and duration unlike most systems where they only change the cam position with a solenoid.
the cam change it's the same in both VTEC and i-VTEC, but the i-VTEC also uses a phase shifter like the used by the VVT-i sistem, wich can change the angle of the camshaft.
Stop ranting ! There's nothing wrong with this system. If it's more expensive, then be it. This system allows for much smoother increase/decrease in valve lift. Variable valve systems aren't difficult to design, hence so many variants. The problem is to make simple yet effective continuous valve lift system. This system can kick in at any desired rpm (if designed so), whilst VVT and similar require high oil pressure (rpm), so they really aren't a better solution.
VVT-iE on Lexus models dont use oil pressure, they use an electronic actuator it is the first and only of its kind. no one has made a system similiar to VVT-iE. and Valvematic is now one step ahead of Valvetronic.
yeah i think its pretty cool the way it works nut has not yet been introduced in a high reving engine yet. and it hasnt been used in cars outside of Japan yet but Toyota plans to release it in all their engines by 2011 0r 2012??? somewhere aorund there... theres a video of it somewhere on youtube called, Toyota Valvematic Engine Features. uses one cam lob per cylinder on the intake side. extremly different than this.
that was super confusing... but i think i got the gist of it. looks as if the intake is working off the exhaust cam. but those power/torque percent increase ans and CO2 emission decrease are similar to Toyota's Valvematic... what i really want to see is A-Vtec. i havent seen that one yet.
valvetronic is way more complex than vvt-iE simple closed-loop diagram witch only has a 10-20 hp increase where bmw's variable timing setup has hp increase of 60-70 and a compression change from 8:1 to 14:1 think about it why does bmw cost so much to repair comparred to your scion or lexus? bmw has been ahead of toyota in scientific manufacuring for years
oh no doubt bro im with you there. i was saying Valvematic is now a step above Vavletronic. but VVT-iE has never been recreated, and what makes it different then regular VVT is that VVT requires oil pressure where as VVT-iE is electronic and works off an accuator. and im talking more in genral of its function. Valvematic works similar to Valvetronic but uses only one cam profile per cylinder, and one variable lift triger (green cam trigers here).
@unresolved777 Only one Lexus engine uses the electronic actuator, 4.6/5.0. Nissan also uses an electric actuator for variable exhaust valve timing on the latest VQ V6's.
Toyota doesn't have Valvematic on any other engine family besides the ZR.
Valvetronic allows for independent lift curves per valve. That allows for swirl generation at low/mid outputs where one valve is lifted more than another.
To its credit, Valvematic is compact, and does not require a lost motion spring.
high-rpm is always a better solution thats where all your power is bmw's variable has almost 4 stages of valve control and compression ratios that range from 8:1 to 14:1
I have to disagree with you on BMW's breaking down. I bought mine used with 55,000 miles and I have almost 80,000 on it now. Absolutely flawless operation.
thats untrue..the parts on a bmw wear out the same way as any honda would. Like any car a bmw can last over 300k miles if its taken care of.(and ive seen such a bmw). i have a 528i and i got it for 10 grand used four years ago and not one thing has gone wrong with it. And it out runs most all v8's. name me a honda that can do that stock..excluding an nsx b/c thats considered a super car
you are talking about brand-new. of course they are more money new. comparing the quality of a new civic to a new 130i or 330i is like comparing a vespa to a sport bike, or a ski boat to a race boat. and by the way, they all come with complete warranties (which makes them more expensive obviously).
from personal experience BMWs are incredibly cheaper than hondas, nissans, etc if they are used.
all the cars i saw were around the same year, but the hondas and nissans had less power, less quality (cloth seating and no power windows and such), and were MUCH higher in price. there was a civic with 150k miles on it, a 2001 i think, for around $15.5k. the first bmw i saw was a 1999 323is with all options, 120k miles, and only $95 OTD.
BMW has made the most advanced engines for the past decade at least. and thats not just my opinion, they've won numerous awards EVERY YEAR for it. look it up. they have by far the best power per liter in their engines and they have the best fuel economy too. Reliability CAN be argued, but dont come on here and start comparing bmw to honda in the sense of technology and valve timing and such. there is no comparison. ask a mechanic if he thinks hondas are better than bmws...
dude. you're an idiot. this is a fully variable valve lift. at idle, the throttle plate is fully open and they just put the valves at minimum lift, and then lift them more when you step on the pedal. it also has FULLY variable cam timing also. vtec just kicks in at whatever rpm. and also there is no way you can increase the displacement of an engine by adjusting the camshaft dumbshit
mivec works similar to vtec, and toyotas vvtl-i is like the other 2 but is based more on hydraulics. in my opinion and experience toyotas system does not work as well as the other two, and is not as tunable. When referring to vtec, i do not mean i-vtec as found on your everyday CRV or jazz. (there are so many variations in vtec , e-vtec, i-vtec ect.. go check them out)
Wrong. valvetronic is similar to VTEC in the way that it increases the lift (the amount of opening on the valve) but hondas vtec dose not do this throughout the rev range, it does this at a predetermined point in the rev range, and at that point the lift-increase is as maximum. The valvtronic system can vary this lift right throughout the rev range. basicaly vtec comes in in one bit hit as the revs hit a certain point. and valvetronic can come in when ever the pedel is pressed 'hard' enough.
Speak for yourself. I'm just as broke as everyone else. Just because I own a new BMW doesn't make me rich. I just got fed up with American cars, Toyota's, Honda's and Hyundai's.
Plus, before bmw introduce this they already have a different variable valve timing called "vanos". the system is different from vtec so bmw is not imitating vtec
hey, i don't that really know 'bout enginerring . But this is totally different from vtec. this is a totally new "Continuous variable valve timing". this is no imitation. this is a pure invention
Cheap VTEC !
TheEuroperules 2 months ago
y would u have a 0 valve lift? doesnt that mean u have absolutely no fuel going in?
Salibs 7 months ago
genius design by the way but ill take my good old American cars still the power band on the cars that use this most be great
statonracing 2 years ago
valeratj if you think your peace of shit jap car is fast or reliable i will race u with my slowest car and it 23 year old v6 buick and every thing in the engine has never been touched asides for valve springs .
statonracing 2 years ago
valeratj vtec locks a third cam follower (rocker arm)onto the other two rocker arms allowing the third rocker arm to ride on a more aggersive cam lobe lol you have no clue do you
statonracing 2 years ago
I think- the ultimate goal is the camless engine. Imagine a solenoid on each valve..software could decide how each valve will move down to the microsecond. Some could stay open to avoid compression losses at idle or cruising.. instant response, always the best possible lift/timing/duration no matter what the rpm or load. That will be the peak of the combustion engine. Until we can do it electrically with software, we'll see all kinds of mechanical contraptions to try and get closer.
proaudiohd 2 years ago 2
That just makes it to were any do it your selfer can't work on it.
roboman79 2 years ago
it would actually simplify the valvetrain and be LESS to work on. Think of all the parts: The timing gears, timing chain, cam, cam bearings, lifters, pushrods, rocker arms, valve springs. On a V8 that's close to 100 moving parts that will no longer be needed. Just a few clicks of a mouse could change the entire character and tourqe curve of an engine. If an actuator goes bad just swap it out, 2 bolts and a plug.
proaudiohd 2 years ago
Hey yahama could you send me this video to my email?
MidShipCivic 2 years ago
This comment has received too many negative votes show
V-tec has the same concept but ueses less compomets,and it sounds better!!!!!!!!
k3vkross 2 years ago
No, vtec is completely different. Also how does variable valve timing sound good or bad? Sorry but you have no idea what you're talking about.
inurkiewicz 2 years ago
Nope, VTEC, VTEC-E and i-VTEC have all only 2 positions; "on" and "off", the valvetronic sistem can change it's position regularly.
This gives more torque and more efficiency.
Fauket 2 years ago
fauket i not sure but but i though i vtec not only retards the cam but also changes its lift and duration unlike most systems where they only change the cam position with a solenoid.
statonracing 2 years ago
the cam change it's the same in both VTEC and i-VTEC, but the i-VTEC also uses a phase shifter like the used by the VVT-i sistem, wich can change the angle of the camshaft.
Sorry for my bad technical english :P
Fauket 2 years ago
Stop ranting ! There's nothing wrong with this system. If it's more expensive, then be it. This system allows for much smoother increase/decrease in valve lift. Variable valve systems aren't difficult to design, hence so many variants. The problem is to make simple yet effective continuous valve lift system. This system can kick in at any desired rpm (if designed so), whilst VVT and similar require high oil pressure (rpm), so they really aren't a better solution.
demios99 2 years ago
VVT-iE on Lexus models dont use oil pressure, they use an electronic actuator it is the first and only of its kind. no one has made a system similiar to VVT-iE. and Valvematic is now one step ahead of Valvetronic.
unresolved777 2 years ago
That's a great news ! Finally, the Japanese take the lead :-)
demios99 2 years ago
yeah i think its pretty cool the way it works nut has not yet been introduced in a high reving engine yet. and it hasnt been used in cars outside of Japan yet but Toyota plans to release it in all their engines by 2011 0r 2012??? somewhere aorund there... theres a video of it somewhere on youtube called, Toyota Valvematic Engine Features. uses one cam lob per cylinder on the intake side. extremly different than this.
unresolved777 2 years ago
watch?v=B82dRiYdCYs&feature=fvw
demios99 2 years ago
that was super confusing... but i think i got the gist of it. looks as if the intake is working off the exhaust cam. but those power/torque percent increase ans and CO2 emission decrease are similar to Toyota's Valvematic... what i really want to see is A-Vtec. i havent seen that one yet.
unresolved777 2 years ago
valvetronic is way more complex than vvt-iE simple closed-loop diagram witch only has a 10-20 hp increase where bmw's variable timing setup has hp increase of 60-70 and a compression change from 8:1 to 14:1 think about it why does bmw cost so much to repair comparred to your scion or lexus? bmw has been ahead of toyota in scientific manufacuring for years
TwisNinja 2 years ago 2
oh no doubt bro im with you there. i was saying Valvematic is now a step above Vavletronic. but VVT-iE has never been recreated, and what makes it different then regular VVT is that VVT requires oil pressure where as VVT-iE is electronic and works off an accuator. and im talking more in genral of its function. Valvematic works similar to Valvetronic but uses only one cam profile per cylinder, and one variable lift triger (green cam trigers here).
unresolved777 2 years ago
Comment removed
SparkDischarge 8 months ago
@unresolved777 Only one Lexus engine uses the electronic actuator, 4.6/5.0. Nissan also uses an electric actuator for variable exhaust valve timing on the latest VQ V6's.
Toyota doesn't have Valvematic on any other engine family besides the ZR.
Valvetronic allows for independent lift curves per valve. That allows for swirl generation at low/mid outputs where one valve is lifted more than another.
To its credit, Valvematic is compact, and does not require a lost motion spring.
SparkDischarge 8 months ago
high-rpm is always a better solution thats where all your power is bmw's variable has almost 4 stages of valve control and compression ratios that range from 8:1 to 14:1
TwisNinja 2 years ago
twisninja high rpm is not always a better solution
statonracing 2 years ago
Probably because people who own those vehicles are smart enough to not race you on public streets, take your wannabe honda elsewhere
lrusak 2 years ago 2
No worries.
PukaMan 3 years ago
I have to disagree with you on BMW's breaking down. I bought mine used with 55,000 miles and I have almost 80,000 on it now. Absolutely flawless operation.
PukaMan 3 years ago 2
thats untrue..the parts on a bmw wear out the same way as any honda would. Like any car a bmw can last over 300k miles if its taken care of.(and ive seen such a bmw). i have a 528i and i got it for 10 grand used four years ago and not one thing has gone wrong with it. And it out runs most all v8's. name me a honda that can do that stock..excluding an nsx b/c thats considered a super car
bubsh101 3 years ago
you are talking about brand-new. of course they are more money new. comparing the quality of a new civic to a new 130i or 330i is like comparing a vespa to a sport bike, or a ski boat to a race boat. and by the way, they all come with complete warranties (which makes them more expensive obviously).
JeffroGymnast 3 years ago
valeratj,
from personal experience BMWs are incredibly cheaper than hondas, nissans, etc if they are used.
all the cars i saw were around the same year, but the hondas and nissans had less power, less quality (cloth seating and no power windows and such), and were MUCH higher in price. there was a civic with 150k miles on it, a 2001 i think, for around $15.5k. the first bmw i saw was a 1999 323is with all options, 120k miles, and only $95 OTD.
hondas re-sell WAY too high.
JeffroGymnast 3 years ago
are you kidding me?
BMW has made the most advanced engines for the past decade at least. and thats not just my opinion, they've won numerous awards EVERY YEAR for it. look it up. they have by far the best power per liter in their engines and they have the best fuel economy too. Reliability CAN be argued, but dont come on here and start comparing bmw to honda in the sense of technology and valve timing and such. there is no comparison. ask a mechanic if he thinks hondas are better than bmws...
JeffroGymnast 3 years ago
so true jeff..once you drive a bmw you'll never want to drive another car ;)
bubsh101 3 years ago
Wow there's so many experts on this page!
PukaMan 3 years ago
dude. you're an idiot. this is a fully variable valve lift. at idle, the throttle plate is fully open and they just put the valves at minimum lift, and then lift them more when you step on the pedal. it also has FULLY variable cam timing also. vtec just kicks in at whatever rpm. and also there is no way you can increase the displacement of an engine by adjusting the camshaft dumbshit
ishmoof1702 3 years ago
Glad you like it. I'll take Valvetronic.
mdmyers7206 3 years ago
mivec works similar to vtec, and toyotas vvtl-i is like the other 2 but is based more on hydraulics. in my opinion and experience toyotas system does not work as well as the other two, and is not as tunable. When referring to vtec, i do not mean i-vtec as found on your everyday CRV or jazz. (there are so many variations in vtec , e-vtec, i-vtec ect.. go check them out)
dapimpdan 3 years ago
Wrong. valvetronic is similar to VTEC in the way that it increases the lift (the amount of opening on the valve) but hondas vtec dose not do this throughout the rev range, it does this at a predetermined point in the rev range, and at that point the lift-increase is as maximum. The valvtronic system can vary this lift right throughout the rev range. basicaly vtec comes in in one bit hit as the revs hit a certain point. and valvetronic can come in when ever the pedel is pressed 'hard' enough.
dapimpdan 3 years ago 2
VTEC has very little in common with Valvetronic.
mdmyers7206 3 years ago
i would agreed about that bmw,benz, or else for the rich ....
wretchead 3 years ago
Speak for yourself. I'm just as broke as everyone else. Just because I own a new BMW doesn't make me rich. I just got fed up with American cars, Toyota's, Honda's and Hyundai's.
z28com 3 years ago
vtec only has 2 cam profile and valvetronic has infinity number of camprofile (just like cvt that has infinity ratio number)
wretchead 3 years ago
Plus, before bmw introduce this they already have a different variable valve timing called "vanos". the system is different from vtec so bmw is not imitating vtec
wretchead 3 years ago
hey, i don't that really know 'bout enginerring . But this is totally different from vtec. this is a totally new "Continuous variable valve timing". this is no imitation. this is a pure invention
wretchead 3 years ago
lol, they use freakin screen door hinge springs.
Nettikturbo 4 years ago
soulja boy tell em! 2 girls 1 cup!
biglamchops 4 years ago
glorious
PukaMan 4 years ago
Fabuloso sistema!!!
colibridelapampa 4 years ago