High Volume Oil Pump

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Oct 5, 2001 | 07:45 PM

85bronco

Thread Starter

Freshman User

Joined: Dec 2000

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High Volume Oil Pump

Is it true that a high volume oil pump could cause problems in a newly rebuilt 351W bore .030 over and a bigger then stock cam?

Thanks

Oct 5, 2001 | 09:09 PM

restorit

Laughing Gas

Joined: Jul 2001

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From: Bismarck, ND

High Volume Oil Pump

I don't know what the bigger cam or newly rebuilt characteristics would have to do with it, but I do know that if you retain your stock oil pan, a high volume oil pump can pump it dry if you're in the habit of winding the motor out. (All the oil will end up in the top of the engine).

Oct 6, 2001 | 08:03 PM

Mulletwagon

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Joined: Jun 1999

Posts: 349

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High Volume Oil Pump

Don't think so. High volume (HV) standard pressure (SP) pumps do not flow any more oil than standard pumps at a given pressure (typically about 45 psi at 2000+ rpm). The only benefit of a HV/SP pump is full pressure (again about 45 psi) at low rpm, like idle speed. A standard pump puts out about 15-20 psi at idle when hot. HV/HP pumps are really good in fishing boats where trolling at low speed for hours is often the norm. A HV / high pressure (HP) pump will flow more oil because of the additional pressure controlled by a heavier spring on the relief valve (so will a standard pump with a shimmed relief valve spring). This is necessary in a high winder. Typically 10 psi is needed for every 1000 rpm i.e., 5000 rpm - 50 psi, 6000 rpm - 60 psi. The only problem with HV/HP pumps is there is a possibility of premature wear on the distributor drive gear as a result of the increased loads turning pump. I have an HV/HP pump in a 351W and get 50 psi at idle and 70 psi above idle.