Valve Train: VANOS

Like all current BMW gasoline engines, the N74 engine is also equipped with variable double VANOS. The VANOS units are common parts shared with the N63 engine, with the exception of the intake unit on cylinder bank though this is also designed to the same principle, it features a drive flange with a slot for the vacuum pump. The N74 uses two VANOS non-return valves, they are now integrated into the VANOS solenoid valves.

The VANOS units have the following adjustment angles:

• VANOS unit intake: 50° crank angle
• VANOS unit exhaust: 50° crank angle