Quote:
Originally Posted by Bfast
Everyone needs to do what they are comfortable with, but I do not understand why people are affraid of a HV pump vs HP pump.
The spring is what dictates the pressure, it has nothing to do with the 25% extra volume that a HV pump is capable of suppying. If you set a standard pump, a HP pump and a HV pump all to 65PSI, it will take the same amount of energy to spin all 3.
The reason I like a HV pump set up properly is, if the bearings clearence is loose, the oil gets thin and the engine needs some extra volume to keep the clearences filled with oil, at least the HV pump is capable of suppying extra oil, where as a HP or standard pump may run out of volume.
I do not like running HV pumps with stock pans, only if the pan capasity has been increased or if an accumulator is used.
Not trying to start an arguement, just throwing in my 2 cents.
Rick
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Well, I hate to say this. but I beg to differ. H/V oil pumps have a larger (taller) gear set than a stock pump there for more contact surface which mean more drag requiring more effort to turn the gear. You can feel this if you have ever primed a engine by hand. Then place a 100lb spring on a H/V pump and hand prime an engine and you'll go holy cow!
If your in a habit of blueprinting an engine then your oil clearances will be fine for a stock pump with a higher pressure spring. I have had experiences at high rpm with a 25% increase volume H/P pump bending the spring pin on the distributor gear changing my timing by 15 degrees..
To each thier own.. I know what works for us and we run some 650hp 408 clevelands at 8500 rpm every pass.
Jeff
