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Original Message
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| RE: 428 Oil PUMP of Choice |
| By John - 12/29/2000 12:03:22 PM; IP 142.177.96.96 |
With 0.025 to 0.030 clearances, the Melling HV57 High Volume pump is the way to go. With cold thick oil the max pressure at idle will be about 80 psi and hot at idle, about 20 psi. To me that's perfent for an FE with small oil galleries. The 10psi rule applies only to Chevs. The pressure, or more correctly flow, at the bearings should be the same no matter what kind of engine you have, and to get this with a Ford's smaller galleries (they increase the back-pressure) you should have more pressure to maintain the correct flow at the bearings.
A originally used a FPP modified HVHP pump and got 145 psi cold oil pressure at an idle...way too high I think. HV only is fine. Also, the HVHP pump practically sucked the sump dry until the oil thinned down as it heated up. I couldn't move the car for a few minutes as the little remaining oil in the sump would slosh and I'd suck an air bubble indicated by a fluctuation on the gauge. And I use solid lifters and oil restrictors to the heads. And that was with a 7 qt oil capacity (pan and filter).
There are other oil mods I did..flaring the main galleries at the main bearings, enlarging the pump to filter adapter gallery, plugging off the hyd lifter galleries, using threaded plugs vs press-in ones....Very meticulpous I was...but still...now I have to tear the engine down again...but such is life. Thanks for your encouragement. |
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