High Volume Oil Pump (Good or Bad) ? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-05-2002, 09:54 AM
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Post High Volume Oil Pump (Good or Bad) ?

Hello,

I have a 289 that has been recently rebuilt and I believe he installed a high volume oil pump.

Someone told me to stay away from High Volume Oil Pumps for mild-medium rebuilt engines. Would high oil pressure add to blow-by?

Any thoughts or feedback on this?

Thanks, Greg.

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Old 11-05-2002, 10:40 AM
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for most basic rebuilds and mildly warmed over engines, a high volume pump isn`t needed, the standard volume will do just fine, High volume and high pressure pumps require more horsepower to drive than the standard ones, and if your not making over 350 - 400 horsepower, then One really isn`t needed. but some just like the idea of a higher volume pump, I`ve Used them on few occasions and always had good service out of them. some run them on engine`s where the clearences are opened up a bit so the engine will be a little looser and rev a little faster according to there theory, but this was only on race engines where the engine would only be ran a few times before a rebuild was needed.in your case, i`d say no, it`s not gonna hurt anything and it won`t add to blow by any.

[ November 05, 2002: Message edited by: DoubleVision ]</p>
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Old 11-05-2002, 02:38 PM
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I have always used a high volume oil pump in my rebuilds ( not high pressure) and have absolutely no problems. High volume doesn't mean high pressure which is a common misconception.
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Old 11-05-2002, 03:06 PM
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High volume pumps are great if the engine is
worn out, but for freshly built engines it's
a waste of money, it'll just pump the oil back
through the bypass faster than a stock pump
which tends to airate the oil, which is a bad
thing if you want the engine to last 150K+ miles...

Steve & the Rockette...
Too many to list...
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Old 11-05-2002, 03:07 PM
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High volume pumps are used where you have increased rod bearing, main bearing, and rod side clearances. Probably not needed when stock tolerances are maintained.
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Old 11-05-2002, 03:27 PM
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Hi volume pumps also push a lot of oil into the top of the engine and may give you drain back problems if you don't enlarge the return holes. Some motors will actually pump the sump dry for this reason. I would avoid using one unless you have a special oiling problem.
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