<VV> Oil Pressure and High Volume Pumps

Ron ronh at owt.com
Tue Aug 31 15:57:11 EDT 2010

"premature bearing wear."

What premature bearing wear?  Corvair bearings last a long time with the 
stock oil pump so what do you call "premature wear"?

----- Original Message ----- 
From: "Dave Keillor" <dkeillor at tconcepts.com>
To: <virtualvairs at corvair.org>
Sent: Tuesday, August 31, 2010 10:44 AM
Subject: Re: <VV> Oil Pressure and High Volume Pumps

> The person who built my engine used a high volume oil pump and a high
> pressure spring.  Here's what he replied when I asked him about it:
> "The crank was done with a special relief of the rod & main bearing
> radius at the journals and all oil holes were fluted. As far as the high
> volume oil pump on a built up street engine, I prefer it for the
> increased oil flow and cooling affect it has on the bearings. The lead
> babbit and copper interface on the bearing has a reduced risk of
> becoming "unclad " and reduce smearing of the material and helps keep
> the bearing tolerances on the compression stroke reducing premature
> bearing wear."
> Dave Keillor
> -----Original Message-----
> From: virtualvairs-bounces at corvair.org
> [mailto:virtualvairs-bounces at corvair.org] On Behalf Of
> jvhroberts at aol.com
> Sent: Tuesday, August 31, 2010 12:26 PM
> To: ricknorris at suddenlink.net; kenpepke at juno.com;
> virtualvairs at corvair.org
> Subject: Re: <VV> Oil Pressure
> IMHO, higher oil pressure carries with it very few sins. The amount of
> HP it takes to drive the pump is really pretty small, so, no biggie
> there.
> However, higher pressure does get you higher oil flow, and that's good
> for a lot of reasons. It allows the oil to carry away more heat, since
> the flow is greater. The higher flow that comes with higher pressure
> also makes oil coolers work better, although, you will see a rise in oil
> temperature simply because the higher oil flow also carries away more
> heat from the engine.
> Obviously, getting to the point where you're blowing gaskets, oil
> filters, stripping the drive gears, etc., is a bad thing, but that's
> probably well north of 100 PSI.
> I don't get the foaming thing, since most of that is caused by windage,
> etc. But that's just me!
> John Roberts
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