Oil pressure @ performance?
 

Say a car has 50lb oil pres at idle and 75-80 at top end at around 65-6800 rpm's......

How much will it improve performance ( if any ) if you have like 20-25 @ idle and around 50 at top end at around 65-6800 rpm's ??
Just some more crazy questions to bother you all with...It is a 283/220 in 66 nova stocker

Thanks,
D W sr

Re: Oil pressure @ performance?
 

Danny, I can't say exactly with your 283. But with our 427/425, changing from the 50W Joe Gibbs BR oil, to Joe Gibbs XP-2, we can gain over a tenth, easily, with about the same oil pressure drop as you describe.

It might help a 283 even more, since it has less HP "to spare".

That's probably what I would try, find a light, but not too light, synthetic oil, make a couple of passes, and then change from your current oil to the new lighter synthetic.

Re: Oil pressure @ performance?
 

Allen, that's not the question, he wants to know same oil, lower pressure via bypass to lower pressure, what is the gain?

Re: Oil pressure @ performance?
 

oil pressure/volume can be too hi unnecessarily---ya only need enough pressure to keep it together as well as help keeping the engine cool----I ran a SBC comp car and it had "maybe 40 pounds going thru the lights !!!! probably less than 25 at the line ---now I realize you probably drive your car back to the pit area but do ya really need a large volume pump or that really hi pressure probably not---the engineers at GM built overkill into the SBC as far as oil pressure/volume in the pan etc.goes-- pressure and volume sap HP from engines ---yep there is HP not only in pressure/volume but the viscosity of the oil ya use too---my 2 cents-- Comp

Re: Oil pressure @ performance?
 

Bub,
I understand that. What I'm saying is, the best way to get some idea of what gain can be had, without taking everything apart and spending a fair amount of time, is to try a really light weight oil.

Sure, the difference in friction between the oils will have an effect, but not as much of an effect as the reduction in HP spent turning the pump.

Once he sees what using the lighter oil will do, then he can look at what he needs to do to run lower oil pressure without risking damage. He'll probably gain even more power, and be pleasantly surprised.

Re: Oil pressure @ performance?
 

I am changing the oil pressure now and still run cam -2 blue blood oil 5w-30..
Will run it at VMP this weekend and see how much diff it will make.
I hope you all are right as i would like that kind of a surprise...
Let you know monday the results....

Thanks again...

Re: Oil pressure @ performance?
 

Danny this might be some help. http://www.superstockforum.com/showt...threadid=11549 Kenney Kelley

Re: Oil pressure @ performance?
 

Danny you have PM

Re: Oil pressure @ performance?
 

Triple XXX Correcto !!!! Doing that reduces the HP necessary to turn the pump and the improvement in lubrication reduces the parasitic drag. And your forgot to mention that with improved lubrication, you can probably get by with less oil in the pan thereby reducing windage.
Unless he's saying he has those pressures with 0 wt oil now. In that case, take it apart.

Re: Oil pressure @ performance?
 

in the newest Car Craft mag, in the 'ask anything' Q&A section there is a letter/answer about just this very thing. also there is a reference to a previous oil pump test.
even a 1 horse change in a 283 will make a difference whereas a 1 horse change in a 427 is almost unnoticed, speaking percent wise.
rod in AZ