The oil pump in an internal
combustion engine circulates engine oil under pressure
to the rotating bearings, the sliding pistons and the camshaft of the engine.
This lubricates the bearings, allows the use of higher-capacity fluid bearings and also assists in cooling the
engine.
The oil pressure generated in most engines should
be about 10 psi per every 1000 revolutions per minute (rpm)
The oil pressure at the pump outlet, which is
what opens the pressure relief valve, is simply the resistance to flow caused
by the bearing clearances and restrictions.
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