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i found this answer while i was searching for something else on Google .. i hope this helps you. Valvetronic From Wikipedia, the free encyclopedia The Valvetronic system is the first variable valve timing system to offer continuously variable timing (on both intake and exhaust camshafts) along with continuously variable intake valve lift, from ~0 to 10 mm, on the intake camshaft only. Valvetronic-equipped engines are unique in that they rely on the amount of valve lift to throttle the engine rather than a butterfly valve in the intake tract. In other words, in normal driving, the "gas pedal" controls the Valvetronic hardware rather than the throttle plate. First introduced by BMW on the 316ti compact in 2001, Valvetronic has since been added to many of BMW's engines. The Valvetronic system is coupled with BMW's proven double-VANOS, to further enhance both power and efficiency across the engine speed range. Valvetronic will not be coupled to BMW's N53, "High Precision Injection" (gasoline direct injection) technology due to lack of room in the cylinder head, or the N54B30 bi-turbo engine. Cylinder heads with Valvetronic use an extra set of rocker arms, called intermediate arms (lift scaler), positioned between the valve stem and the camshaft. These intermediate arms are able to pivot on a central point, by means of an extra, electronically actuated camshaft. This movement alone, without any movement of the intake camshaft, can open or close the intake valves. Because the intake valves now have the ability to move from fully closed to fully open positions, and everywhere in between, the primary means of engine load control is transferred from the throttle plate to the intake valvetrain. By eliminating the throttle plate's "bottleneck" in the intake track, pumping losses are reduced, fuel economy and responsiveness are improved. It is important to note however, that the throttle plate is not removed, but rather defaults to a fully open position once the engine is running. The throttle will partially close when the engine is first started, to create the initial vacuum needed for certain engine functions, such as emissions control. Once the engine reaches operating speed, a vacuum pump run off the passenger side exhaust camshaft (on the N62 V8 only) provides a vacuum source, much as a diesel engine would, and the throttle plate once again goes to the fully open position. The throttle plate also doubles as an emergency backup, should the Valvetronic system fail. In this case, the engine would enter a "limp home" program, and engine speed would once again be controlled by the throttle plate. Valvetronic has so far been limited to BMW's mass-market engines, with no high-performance M-series car using the technology. The Valvetronic hardware adds a great deal of mass to the valvetrain, limiting maximum engine speeds (~7,000 rpm peak rpm in N52) engines and making it unsuitable for the high-revving M engines. Retrieved from "http://en.wikipedia.org/wiki/Valvetronic"

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Q: What is valvetronic?
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Where and what is the valvetronic motor drive?

Valvetronic is BMW's variable intake valve lift system. BMW uses it to control engine speed and reduce pumping losses, increasing fuel economy and power. It consists of an eccentric shaft and electric motor that the camshaft's followers ride on. All the parts are located under the cylinder head cover or in the cylinder head. Where Honda's old V-TEC had one step change from cam lobe to cam lobe at a preset rpm, Valvetronic, in conjunction with VANOS (BMW's variable valve timing), is infinitely variable based on engine speed and load, etc.


What is a valvetronic on a mini cooper?

Valvetronic is BMW's name for its variable valve lift technology. It can vary the amount of lift at the valve to suet the needs of the motor. It consists of an eccentric shaft that is moved by an electric motor, increasing/decreasing the amount of lift at the valve. There are youtube videos and in-depth descriptions on how it works. FYI, BMWs also use it to control engine speed, the Throttle body on BMW engines is there as a safety feature required by law and is actually open 100% when the engine is running. This reduces pumping losses, increasing HP and MPG.


Why is my 2008 mini cooper service engine light on?

if your mini is the non-turbo version, most likely it is caused by a loose gas cap. if your engine is running a bit sluggish or rough, it may be the valvetronic motor drive. although the best way to find out is to take your car to the nearest mini dealer.


What is special in BMW cars when compared to others?

The amount of technology, advanced features. -They are the only manufacturer to have a constantly variable runner length intake manifold. -First drive by wire car -First electric parking brake -Vanos, the first constantly variable valve timing for intake and exhaust -Valvetronic, the first continuously variable valve lift system - First Dual metal engine block -first production ready hydrogen vehicle