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Old 02-08-2005, 12:11 PM
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Question High Volume Oil Pump

What makes an oil pump a high-voume oil pump? Is it a desgin feature that might make it produce a whirring sound when its cold? I get a whir/whine that sounds deep and centered when the motor is first started but which always goes away after 5 minutes or so of running. Oil pressure reading is always great. Thanks for any clues.

Butch

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Old 02-08-2005, 12:31 PM
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An oil pump is a positive displacement gear or rotor pump. Make the gears taller, put out more oil - pretty simple design. Most engines don't require more than a stock pump so a high volume pump will over-work the entire drive system. Your sound is probably the bypass valve dumping all the excess of cold oil from the too-big pump and the spring is oscillating and making that sound. Once the oil heats up and viscosity reduces, the bypass isn't so noisy.
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Old 02-08-2005, 01:27 PM
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Thanks, Willys. I've heard the bypass suggestion from another and am glad to hear it again from you! The link below will take you to a directory on my son's server where theres some photos of the car and my trailer. Enjoy.

http://www.whootis.com/pics/trailer/

Butch
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Old 02-08-2005, 02:16 PM
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Super!
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Old 02-08-2005, 02:59 PM
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Watch those Hi Volume oil pumps they will pump all the oil to the top of the engine and you will spin a bearing or worse. If your not racing stock will work fine.
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Old 02-09-2005, 02:52 PM
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hi very nice car
for my new engine 350 chevy
i am going to usa a big block pump
10% more flow over stock the big block pump has 12 theeth gears
and the small bl pump has 7 theet inner gears so you have a better oil puls
you need a 0.125 inch shorter primer from moroso
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Old 02-09-2005, 02:56 PM
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high volume pump

High volume pumps are for 4x4s. You can get more oil to the top of the motor at low rpm. High rpm engines need at least a 7 quart pan to use a high volume pump.
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Old 02-09-2005, 03:14 PM
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Re: high volume pump

Quote:
Originally posted by bracketeer
High volume pumps are for 4x4s. You can get more oil to the top of the motor at low rpm. High rpm engines need at least a 7 quart pan to use a high volume pump.
Hoo boy.



tom
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Old 02-10-2005, 01:25 AM
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my experience

I put a high volume pump in my motor. I kept losing oil pressure over 130 mph. I went to my local speed shop and was told to remove it. I took it out. I never used another one til my Lemans. I have a 7 qt Milodon on it. No problems.
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