The term Valvetronic summarises two functions. Firstly, the variable valve timing adjustment on the camshaft positions for intake and exhaust valves, known by the name of double-Vanos. Secondly, the performance control via variable lift on the intake valves.
The valve lift is adjusted smoothly from 0.3 millimetres to as much as 9.5 millimetres and thus fulfils the function previously performed by a throttle butterfly. Control and monitoring is the task of the engine management unit. The advantage is a twelve per cent reduction in fuel consumption, more power and torque.
You can find answers to further technical questions in our BMW Technology Guide at www.bmw.at/techniklexikon, also available in the “BMW Insights” section under “Technology and Innovation” and “Technology Guide”.