Oil Pressure

Oil pressure is an important factor in the longevity of most internal combustion engines. With a forced lubrication system (invented by Frederick Lanchester), oil is picked up by a positive displacement oil pump and forced through oil galleries (passageways) into bearings, such as the main bearings, big ends and camshaft bearings. Other components such as cam lobes and cylinder walls are lubricated by oil jets.

Sufficient oil pressure ensures that the metal of the rotating shaft (journal) and the bearing shell can never touch, and wear is therefore confined to initial start-up and shutdown. The oil pressure, combined with the rotation of the shaft, also hydrodynamically centers the journal in its shell and cools the bearings. Such a bearing is known as a fluid bearing.

Oil pressure is higher when the engine is cold due to the increased viscosity of the oil, and also increases with engine speed until the relief valve opens to divert excess flow. Oil pressure is lowest under hot idling conditions, and the minimum pressure allowed by the manufacturer's tolerances is usually given at this point. Excessive oil pressure may indicate a blocked filter, blocked oil gallery or the wrong grade of oil. Low oil pressure indicates worn bearings on the crank shaft or a broken oil pump.

Other articles related to "oil pressure, oil, pressure":

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... The oil pressure tell-tale lights when engine oil pressure drops below a predetermined level ... This tell-tale can bear the legend oil or a pictogram of an oil can ...
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1978 Indianapolis 500 - Box Score
22 80 ... Larry Dickson 193.434 0 ... Oil Pressure 71 ... Rick Mears 200.078 0 ... Engine 8 ... Pancho Carter 196.829 0 ... Header 11 ... Roger McCluskey 192.256 0 ... Clutch 26 ...
Oil Pump (internal Combustion Engine) - Oil Pressure
... The oil pressure generated in most engines should be about 10 psi per every 1000 revolutions per minute (rpm), peaking around 55-65 psi ... Local pressure (at the crankshaft journal and bearing) is far higher than the 50, 60 psi c ... This higher pressure is developed by the relative speeds in feet per second (not RPM or journal size directly) of the crankshaft journal itself against the bearing, the bearing width (to the ...

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