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VANOS

As known from the S62, the VANOS system is

used on the S85 to adjust both the intake

camshaft as well as the exhaust camshaft. The

intake camshafts have an adjustment range of

60° crankshaft angle and the exhaust

camshafts 37° crankshaft angle.

The oil pressure of 115 bar is produced by a

high pressure pump installed in the oil pan.

The high pressure pump is driven through a

gearwheel directly from the crankshaft.

The pressurized engine oil is routed via two

delivery lines to the two VANOS control units

and to the pressure accumulator.

The adjustment units feature two proportional

valves that ensure infinitely variable control of

the oil pressure. Compared to the directional

control valves used formerly, proportional

valves ensure shorter control times and

greater operational reliability.

9 - VANOS control unit

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BMW M5 Wartungshandbuch Seite 19