BMW Valvetronic

[Olengher]

@GeorgeC1992 Vtec is two steps, this is variable, it has an infinite number of steps.VTEC was made probably to be a cheap replacement for a turbo, to give power and economy with low price.This is a proper system with no compromise, makes almost diesel like economy in sports cars.Unfortunately the benefits are not so good combined with turbo.

[TheForza1000]

Wikipedia...VVT....Alfa Romeo were the first to use VVT on mass production cars in

1980...followed 3 years later by the cloning nation Japan ie Vtec...facts just google it

[88jamesy88]

@sparkdischarge

OK then brainiac, look on the side of the truck!

[nomaddesign1]

Valvetronic uses variable valve LIFT to control the "throttle" instead of the traditional throttle plate(s) father back in the intake. Totally different from (and separate ) from VTEC which controls varies valve TIMING. Used in combination with VANTOS both LIFT and TIMING are variable.

[88jamesy88]

Ford's infinitely variable valve timing on the Coyote V8 and Eco Boost V6 are superior to either of these since it can retard and advance the (cam) timing at the same time as changing the lift. Also its 413BHP on pump gas from a 5.0 is better than the MBZ engine of the same capacity. And its right here at HOME.

[SparkDischarge]

@88jamesy88 There is no lift change on either Ford's 5.0 or twinforce 3.5 V6 (EcoBoost is trademark of Whirlpool washing machines)

Ford's 5.0 does deserve credit for having the most valve lift of any production 4 valve cylinder head. 12 mm.

[fruchttragend]

@88jamesy88 That is the same old same technology in the Toyota VVT-i and VVT-ii

[ndquek]

I think Valvetronic is the few which can vary the amount of lift, beautiful. Honda is much simplier but it is either off/on. Pros & Cons, both are awesome!!

[Lambo0225]

than a oil actuated locking pin that engages at a specific RPM bring the middle "dummy rocker" together with the other 2 outter rocker arms

[Lambo0225]

V-TEC more power maybe... definitley not better fuel economy with only 2 settings (under 4500 rpm and over 4500 rpm) whereas, the valvetronic uses the lobes of extra "electonically driven camshafts" to assist the "true camshafts" by pretentioning the "intermediate rocker arms" so when the camlobes contact the "direct rockers" they allow greater valvelift VERY MUCH DIFFERENT SYSTEM MUCH MORE INTRICATE

[helixworld]

Valvetronic is overated...  There is always a tapping sound from the cams, and the throttle response is ss-l-o-o-o-ww.

[JesterZ325iE46DBM]

@helixworld ; BMW's E46 and later have a slower throttle response, because they already started to implement fuel eficiency (efficient dynamics, waaaaay before any other car company). After 2001 BMW are set on too little fuel injection and more outflow restriction with 2 cat's and dampers. If you want throttle response, chip (not reprogram, grade 2 chiptuning or better) ur Beamer and remove the dampers and at least 1 cat, install a race cat and it will still be legal.

[dtranbikesalot]

Civics don't suck. It's a excellent car for what it was made for. As a FSAE student, I've examined all the kinds of VVT offered by different manufacturers. VTEC is still the simplest, most reliable way to do it. Everyone else is just trying to copy it. Valvetronic is no different. It's got a shitload of extra parts. The Japanese make good, reliable, and economical cars. I drive a Toyota truck and hell it may not be faster than my bro's 330i but at least it turns on and goes every day.

[Chrisapoo23]

my 325is turns on and goes everyday..

[teddyd2009]

@Chrisapoo23 those german mechanics must be doing a good job then :)

[DrMotorDude]

@dtranbikesalot Actually, if you ever take a trip to Germany, go to Leipzig (the new BMW complex) or the old one and the museum in Munich. VANOS (then under various names for valve timing) was was used by FE/BMW/Rapp's aircraft engines in 1916 (before they moved from Eisenach to Munich.) Since Honda was founded in 1948, VTEC is, in fact, a copy of VANOS. NOT that they haven't made good engines BUT, I do criticize Honda for their electrical systems = simply terrible.

[gwindow77]

Well, the most advanced valve actuation system is used by FIAT. Check out Fiat MultiAir.

[RossLH]

Also, theres a fair handful of companies using electronic lift control. Toyota, Nissan (as previously stated), GM, and Ford just to name a few.

[nestosdaboss]

the only cars that have variable valve timeing and electronic lift are porshe bmw and honda wow oh and f1 cars that has something to be said about how ahead of there time honda was

[RossLH]

Honda? VTEC is a primitive VVT system, and was far from the first. Fiat did it in the 1960s, and Honda didn't come out with VTEC until the late 80s--2 decades later. The 300ZX had electronic variable lift control before VTEC even existed.

[MidShipCivic]

300zx altered valve timing not lift like vtec did you fucken retard.

[shift2max]

But at the end of the day it's still a slow, shitty economy car. Civics suck : )

[MidShipCivic]

Valvetronic was developed for fuel economy.

At the end of the day really just don't give a damn about people like you who act truly ignorant.

[shift2max]

That hurt my feelings man, it truly did. I'm just saying, a Civic is NOT built to be a sports car in any way. Even the SI is really nothing impressive. FWD limits the cars handling hardcore. BMW builds every car to high handling standards.

[MidShipCivic]

high quality standards? Google - > BMW recalls.

I don't care about your Civic nonsense.

[shift2max]

If you are on a pioneer in automotive technology you are going to have issues, sure. Doesn't change the fact that they build an amazing car. Honda wouldn't know anything about cutting edge, they like to incorporate technology after everyone else figures it out for them.

[doldei]

is valvetronic the same as vanos...looks that way...and v-tec is nice but the thing with the slidind rods and all those moving parts...i gess the change of lift by simply changing an angle is simply awesome

[4strokepwr16]

valvtronic is way better than vtech...vtech can only change the timing once and thats upwards of 5000 rpm depending on what motor...valvetronic is can be adjusted throught the entire rpm range...much better even tho i hate bmws

[GT35RK20Z1]

True but you forgot about i-vtec where you have 2 cam profiles and can adjust the the cam angles on both cam profiles up to 50 degrees depending on rpm and load, and timing is also controlled electronically for rpm and load, all using Hondata Kpro.

[theriontom]

V-TEC is still better. More used than VANOS.

[seroyer2]

I would agree with you VANOS is very complex and breaks down. it very expensive to replace

[theriontom]

Yes but it's very good if you get in M power models. like DualVANOS on V8 or V10.V-TEC is the first type of this system in the world.

[PukaMan]

VANOS was the first continuously variable valve-timing, though

[theriontom]

V-TEC was first used in 1983 in CBR400, but 5 years before(1978) was invited and known. First VANOS was known 1990 and used 1992..for Single VANOS, Double VANOS in 1995,used the same year.

[PukaMan]

I know that already.

[hondacivicee9]

well...it does the same as vtec anyway...that mechanical parts dosent look the same ...its stil vtec

[nedogligge]

to save fuel bmw made this system, not like vtec, mivec or vvt-i wich was made to go fast:) variable valve timing rules but Double VANOS i a BMW rocks..

[wretchead]

i agreed with some statement you made, but this camprofile also increase power also the fuel economy

[blackXSpr]

VTEC and VANOS both produce more power and better fuel economy

[JeffroGymnast]

This isn't VANOS.

anyways, PukaMan was saying that VANOS was the first CONTINUOUSLY variable valve timing. v-tec has two settings, VANOS has thousands.

[blackXSpr]

I never said it was... im quite aware its not. I was simply stating that both VTEC and VANOS give better fuel economy.

[MidShipCivic]

Vano is merely active cam timing . I-vtec does the same thing on the intake camshaft.

Vanos does not control lift.

[JeffroGymnast]

this is not vanos, its valvetronic.

[MidShipCivic]

Shut your damn mouth everyone knows that. you're the one comparing VANO which alters valve opening to VTEC which alters lift and duration.

[JeffroGymnast]

back to the original comment by nedogligge... valvetronic does improve engine power, not just gas mileage. it eliminates pumping losses but it also gives you a very flat torque line compared to just double vanos.

[MidShipCivic]

Wrong again, it does not ELIMINATE pumping losses the engine has valves, the valve are an obstruction to air. Valvetronic reduces pumping losses significantly, but does not eliminate it.

[JeffroGymnast]

no need to be an ass about it. obviously it doesnt eliminate pumping losses from the valves. but it eliminates losses from the TB which is the farthest you're gonna get, at least with today's engines.

[YoungJordan23]

yep, you're right. The N54 doesn't need valvetronic because the turbos do the same thing.

[JeffroGymnast]

the turbos do something completely different... in fact, bmw's new turbo engines include valvetronic as well.

[YoungJordan23]

I bought just bought a 2010 BMW 135i, that's a twin turbo inline 3.0L 6 cyl and doesn't have valvetronic.  I asked BMW why they don't have it on this motor and they said its useless on a turbo motor. the non turbo N54 has valvetronic and is also made of magnesium/alluminum.

[JeffroGymnast]

its not useless at all..... im not sure but i think the twin turbo v8 has valvetronic and im sure that the 535i GT has it. look it up its an awesome design.

[mikegrecia]

something like vvti???

[vacuumreservoir]

Not really, If you look carefully, it's all on roller followers.

[irbabuin]

Friction supreme.