BMW Valvetronic Variable Valve Lift

BWM Valvetronic Electronic Valve Lift Valvetronic engines use a combination of hardware and programing to abolish the need for a regular throttle mechanism. Valvetronic varies the lift of the intake valves. Based on signals formerly taken mechanically from the accelerator pedal position sensor, the stepper motor changes the phase of the eccentric cam, modifying the action of the intake system has a conventional intake cam, but it also uses a secondary eccentric shaft with a series