Oil pressure @ performance?

danny waters sr · 10-10-2011, 06:21 PM

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

Alan Roehrich · 10-10-2011, 06:51 PM

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.

Bub Whitaker · 10-10-2011, 06:56 PM

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

FED 387 · 10-10-2011, 07:00 PM

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

Alan Roehrich · 10-10-2011, 08:35 PM

Quote:

Originally Posted by Bub Whitaker

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

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.

danny waters sr · 10-10-2011, 09:11 PM

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...

Kenney Kelley · 10-10-2011, 10:00 PM

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

Tom Meyer · 10-10-2011, 10:01 PM

Danny you have PM

Pvt Parts · 10-10-2011, 10:12 PM

Quote:

Originally Posted by Alan Roehrich

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.

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.

rod · 10-10-2011, 11:05 PM

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

10-10-2011, 06:21 PM	#1
danny waters sr VIP Member Join Date: Apr 2007 Location: lagrange,nc Posts: 2,224 Likes: 1 Liked 0 Times in 0 Posts	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 __________________ Danny Waters, Sr / 73 Duster "340"

10-10-2011, 06:51 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,098 Likes: 1,550 Liked 1,778 Times in 404 Posts	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. __________________ Alan Roehrich 212A G/S

10-10-2011, 06:56 PM	#3
Bub Whitaker Member Join Date: Feb 2005 Location: Dayton, MD Posts: 222 Likes: 0 Liked 1 Time in 1 Post	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? __________________ Bub Whitaker

10-10-2011, 07:00 PM	#4
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,412 Likes: 512 Liked 329 Times in 177 Posts	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

10-10-2011, 09:11 PM	#6
danny waters sr VIP Member Join Date: Apr 2007 Location: lagrange,nc Posts: 2,224 Likes: 1 Liked 0 Times in 0 Posts	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... __________________ Danny Waters, Sr / 73 Duster "340"

10-10-2011, 10:00 PM	#7
Kenney Kelley Member Join Date: Dec 2006 Location: Cocoa Florida Posts: 205 Likes: 177 Liked 72 Times in 36 Posts	Re: Oil pressure @ performance? Danny this might be some help. http://www.superstockforum.com/showt...threadid=11549 Kenney Kelley

10-10-2011, 10:01 PM	#8
Tom Meyer Senior Member Join Date: Aug 2003 Location: Pierce NE Posts: 934 Likes: 75 Liked 351 Times in 120 Posts	Re: Oil pressure @ performance? Danny you have PM __________________ Tom Meyer 5240 SS Stock ???

10-10-2011, 11:05 PM	#10
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 313 Likes: 0 Liked 20 Times in 15 Posts	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