<VV> Oil Pressure and High Volume Pumps

[jvhroberts at aol.com]

 Yep. And with more pressure and flow, you can do things like add oil reliefs to the rods and throw more oil at the base of the pistons, etc. 

However, something to keep in mind, a bigger pump won't flow more oil to the bearings without more pressure. In fact, all a bigger pump will do, most of the time, is put more oil flow through the regulator, although it should raise idle pressure. 
So, yeah, big fan of a bigger pump, but only if there's a higher pressure regulator to go with it. 

 

John Roberts
 

 

-----Original Message-----
From: Dave Keillor <dkeillor at tconcepts.com>
To: virtualvairs at corvair.org
Sent: Tue, Aug 31, 2010 1:44 pm
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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