pressure that keeps oil on the moving parts of an internal-combustion engine
Oil pressure is an important factor in the longevity of most internal combustion engines. With a forced lubrication system, oil is picked up by a positive displacement oil pump and forced through oil galleries 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 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.
The numerical value of oil pressure in Chaldean Numerology is: 9
The numerical value of oil pressure in Pythagorean Numerology is: 4
Images & Illustrations of oil pressure
Find a translation for the oil pressure definition in other languages:
Select another language:
Discuss these oil pressure definitions with the community:
Word of the Day
Would you like us to send you a FREE new word definition delivered to your inbox daily?
Use the citation below to add this definition to your bibliography:
"oil pressure." Definitions.net. STANDS4 LLC, 2017. Web. 27 Jun 2017. <http://www.definitions.net/definition/oil pressure>.