BMW Valvetronic

Operating Parameters:

Valve lift is variable between 0 and 9.7 mm.
Adjustment of the worm gear from one extreme to the other takes 300 milliseconds.
Combined with double-Vanos valve timing technology, the camshaft angle relative to the crankshaft can be adjusted by up to 60°.
The intermediate arm is finished to a tolerance of 0.008 mm.
The cams controlling the eccentric shaft are machined to tolerances of a few hundredths of a millimeter.

Category:

Autos & Vehicles

Tags:

• BMW
• valvetronic

[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.

[blackXSpr]

VTEC and VANOS both produce more power and better fuel economy

[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

[fruchttragend]

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

[88jamesy88]

@sparkdischarge

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

[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.

[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.

[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.

[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!!

[teddyd2009]

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