VANOS (abbr. from German variable Nockenwellensteuerung) is an automobile variable valve timing technology developed by BMW, first introduced in 1992 on the BMW M50 engine used in the 5 Series.
VANOS is a combined hydraulic and mechanical camshaft control device managed by the car’s DME engine management system which serves to vary the timing of the valves by moving the position of the camshafts in relation to the drive gear.
The VANOS system is based on an adjustment mechanism that can modify the position of the intake camshaft versus the crankshaft. Double-VANOS adds an adjustment of the intake and outlet camshafts.
VANOS operates on the intake camshaft in accordance with engine speed and accelerator pedal position. At the lower end of the engine-speed scale, the intake valves are opened later, which improves idling quality and smoothness. At moderate engine speeds, the intake valves open much earlier, which boosts torque and permits exhaust gas re-circulation inside the combustion chambers, reducing fuel consumption and exhaust emissions. Finally, at high engine speeds, intake valve opening is once again delayed, so that full power can be developed.
VANOS significantly enhances emission management, increases output and torque, and offers better idling quality and fuel economy.
If your VANOS is worn or noisy, you will experience a lack of low-end power and poor performance. We can rebuild your VANOS to resolve engine performance problems that are due to a malfunctioning or stuck VANOS- restoring power and performance for a fraction of the cost of replacing it with a factory refurbished unit; just give us a call or schedule an appointment online.