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ST/RS Fords
Focus ST
ST oil pressure concern/question
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<blockquote data-quote="Jimmysidecarr" data-source="post: 12961593" data-attributes="member: 11681"><p>You technically only need between 6 and 8 PSI of oil pressure per 1,000 rpm.</p><p>That is to be checked when the oil is as hot as it is likely ever to get.</p><p></p><p>All oils thin when they get hot and thicken when they cool off, therefore a car's hot oil pressure will always be lower than it's cold oil pressure.</p><p></p><p>The oil pressure is also RPM dependent, for the most part.</p><p></p><p>Thicker oil and overly high oil pressure does not equal better protection. Chemistry is where the most significant protection gains can be made, because the oil's film strength can greatly benefit from superior chemical compounds being used in certain oils.</p><p></p><p>Film strength matters because there are lots of lubricated areas that are not pressurized journals.</p><p></p><p>Above a certain RPM the pressure does not need to increase any more because of the hydrodynamic wedge created by the rotation of the parts being lubricated by a pressurized journal. The hydrodynamic wedge creates the cushion, the oil simply needs to get delivered.</p><p></p><p>Most engine oil pumps have a pressure relief valve that allows the pressure to plateau at a certain predetermined high. More pressure is not needed at very high rpm.</p></blockquote><p></p>
[QUOTE="Jimmysidecarr, post: 12961593, member: 11681"] You technically only need between 6 and 8 PSI of oil pressure per 1,000 rpm. That is to be checked when the oil is as hot as it is likely ever to get. All oils thin when they get hot and thicken when they cool off, therefore a car's hot oil pressure will always be lower than it's cold oil pressure. The oil pressure is also RPM dependent, for the most part. Thicker oil and overly high oil pressure does not equal better protection. Chemistry is where the most significant protection gains can be made, because the oil's film strength can greatly benefit from superior chemical compounds being used in certain oils. Film strength matters because there are lots of lubricated areas that are not pressurized journals. Above a certain RPM the pressure does not need to increase any more because of the hydrodynamic wedge created by the rotation of the parts being lubricated by a pressurized journal. The hydrodynamic wedge creates the cushion, the oil simply needs to get delivered. Most engine oil pumps have a pressure relief valve that allows the pressure to plateau at a certain predetermined high. More pressure is not needed at very high rpm. [/QUOTE]
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