What is vanos?

VANOS is a variable valve timing system that was developed by BMW and first introduced in 1992. The system was designed to improve engine efficiency and performance by allowing for the adjustment of the timing of the intake and exhaust valves.

VANOS uses a mechanism that varies the timing of the intake and exhaust valves by rotating the camshaft relative to the crankshaft. This allows for better control of the engine's combustion process, enabling improved power delivery and fuel efficiency.

There are two main types of VANOS systems: single VANOS and double VANOS. Single VANOS adjusts the timing of the intake valves, while double VANOS adjusts both the intake and exhaust valves.

Overall, VANOS has been widely praised for its ability to improve engine performance, responsiveness, and fuel efficiency in BMW vehicles. It has since been adopted by other automakers as well.