Valvetronic

The Valvetronic system is a variable valve timing system to offer continuous and precise control over variable intake valve lift, from 0.3 to 9.7 mm (0.18mm to 9.9mm, Valvetronic II and III), and duration. It typically works in conjunction with the independent Double VANOS system that continuously varies the timing (on both intake and exhaust camshafts). Valvetronic-equipped engines rely on the amount of valve lift for load control, 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.