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Old 01-25-2008, 05:09 PM
cliff tate cliff tate is offline
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Originally Posted by curtis73
It also depends on the engine. For instance, chevys with their priority main oiling, high volume is great. It doesn't necessarily need high volume, but it can be a nice safety margin. For BBFs with proirity cam oiling, the mains sometimes get starved and I'd rather see a high pressure pump in them for performance applications.

But; here's my probem with high pressure oil. 60-70 psi is all you need for 7000 rpms. Anything higher than that and the bypass valve will open and send oil around the filter. That means the engine is getting unfiltered oil. You can change the bypass spring pressure to prevent the valve from opening, but 80 psi is about the point where filters explode or the o-ring seals blow out.

High pressure is typically reserved for really high RPM applications like racing. 10 psi per 1000 rpms is all you need, so unless you're revving over 7000 rpms, don't worry about it.
when relief opens oil does not by pass the filter. cliff
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