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Original Message
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| RE: Oil pressure improvement |
| By John - 10/22/2002 8:16:22 PM; IP 142.177.108.231 |
| Well Ted...I think a lot of people would disagree with you because of the way you stated your letter, but essentially you are right. As long as oil is there, nothing will be damaged. Remember though, as the rpm increases, centrifigal forces will bleed oil off the rod bearings, so some additional pressure is needed at the mains to foce more oil to the rods. Now Allen, a high volume pump merely has taller gears (rotors) to put more volume out of the pump. The High Pressure pump merely has a stronger relief spring that allows the oil pressure to build to a higher maximum level before it opens and levels the pressure off. Interestingly, all the high pressure pumps I've seen were also high volume, but this doesn't have to be the case. Also pressure from a pump is only generated from the restriction of oil by the engine, primarily due to beaigns clearances. So, a high volume pump will increase oil pressure throughout the rpm range until the max pressure is achieved which is set by the strentgh of the oil pressure relief spring. Also, the origianl question about half-shelling the bearings is a distorted fact about using slightly different size bearings to achieve a preselcted clearance. I agree with Royce that if you try mixing and matching old and new bearings, a failure will almost certainly occur. Try the high volume pump, a low restriction oil filter and things should be fine until the engine starts to make noise ....then you need a rebuild. |
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