Re: Re: Low Oil Pressure

Posted by davidval on August 04, 2003 at 03:10:06 from (80.230.188.76):

In Reply to: Re: Low Oil Pressure posted by allan b. on August 03, 2003 at 21:04:37:

the engine oil has a few jobs in the engine.
for lubrication, as long as there is pressure in the bearings, there is lubrication. but oil also have to pass through the filter and oil lines(in full flow systems), cool the internal parts of the engine. excess oil is splashed from the bearings to cool pistons and cylinders.
if pressure is too low, there will not be enough oil for cooling. if pressure is too high you can get into exccessive oil burning.
oil pressure is determined by pump capacity, bearing clearances and regulating valve setting. in many engines the valve sets pressure at high rpm while pump and bearings at low rpm. if the condition of the pump and the bearings deteriorates, pressure at lower rpm may drop enough to cause damage. cooling, when there is no oil cooler, is done by heat discipation in the crankcase.
modern engines, especially turbocharged, have higher capacity oil pumps with turbocharger lube, piston cooling nozzles and oil coolers
they also operate at higher pressures (at the 50 psi zone) and have smaller tolerances at the bearings.
david

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