Lubrication System Description; Resonance/Turbulence Intake System - BMW 1999-2005 M3 Service Manual

Engine-General
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allows the engine to be operated at
higher controlled temperatures during
low and part throttle. This optimizes
operating temperatures in both cylinder
head and block, reduces friction and
thereby fuel consumption.
The cooling system is designed to:
Reduce operating temperatures of
cylinder head. The result of lower
temperatures is increased torque
due to improved volumetric
efficiency.
Increase operating temperature of
cylinder block.
Lubrication system
The lubrication system is pressurized
whenever the engine is running. The oil
pump draws oil through a pickup in the
bottom of the oil pan, then forces it
through a replaceable oil filter and into
the engine oil passages.
The chain-driven oil pump is bolted to
the bottom of the cylinder block inside
the oil pan. A pressure relief valve limits
the maximum system pressure. A
bypass valve prevents the oil filter from
bursting and insures engine lubrication
should the filter become plugged. See
119 Lubrication System
information.
Resonance/turbulence intake
system
The intake manifold, made of molded
plastic, is configured as two sets of three
runners. This design enhances low end
for additional
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