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VANOS: VAriable NOckenwellen Steuerung (German) - A combined hydraulic and mechanical camshaft control device managed by the car's DME engine management system. The VANOS system is based on a discrete adjustment mechanism that can modify the position of the intake camshaft versus the crankshaft.
| 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 and moderate load, the intake valves open much earlier, which boosts torque and permits exhaust gas re-circulation inside the combustion chambers, and exhaust emissions. At moderate speeds and light loading the camshaft is retarded reducing fuel consumption. 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.
VANOS was first introduced in 1992 on the BMW M50tu engine used in the 5 Series. | |
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