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Old 06-11-2005, 05:50 PM
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High Volume Oil Pump Question

in the HP And ET guestimation thread, it was said that a high volume oil pump was robbing about half a dozen horse,

i thought That a high volume oil pump was good ?

i'm gona build a strong street 350 sbc what oil pump should i use ?




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Old 06-11-2005, 06:30 PM
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use a stock pump, upgrade the sping if you like unless you're running a motor that sees a long period of high RPM stretches. High volume pumps move more fluid, and we're talking about a mechanical device here. The more fluid you move, the more power it takes. Some say up to 10-12 horse. I tend to believe its probably more like 5-8.

Furthermore, you can suck your oil pan dry (so they say, I've never seen it happen) with a HVHP oil pump.

Chevy motors have great oiling from the factory, unless you're running nextel cup, use a stock unit.

K
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Old 06-11-2005, 07:32 PM
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Thanks, makes sence





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Old 06-11-2005, 07:55 PM
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What killer said is right on the money.
The purpose of a high volume pump is to compensate for the increased bearing clearances in hi HP/ hi RPM engines. Most of the GM factory hi HP engines, if I remember correctly, use a std. volume/ hi pressure pump.
As far as sucking the pan dry, it can get close with a stk. oil pan on a hi RPM engine. Go with increased pressure, not volume unless absolutely necessary.
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Old 06-11-2005, 08:05 PM
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If your going to use a pump just get a new melling M55 pump. It is a slightly upgraded version of the old chevy stock pump. Cheap and effective the way to go...M55

Chris
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