HP

[marvstrick]

How much hp will 80 lbs oil pressure rob in stock 305 gm stocker

[GTX JOHN]

What weigh oil?
If 5/20 my guess is about 5 to 6 over 50 or 60
in my small block Mopar
Your combo should be similar.
Heavier oil would make more difference.

[nolongerracing]

Originally Posted by marvstrick

How much hp will 80 lbs oil pressure rob in stock 305 gm stocker

Zero... been there done that

[Stan Weiss]

What is the controlling factor limiting you to 80 psi? Is it your engines clearances or the pump relief spring? If the pump relief spring how much extra oil are you pumping?

Stan

[Signman]

Did a lot of work with oil control and oil pumps on SBC.
Although did not back to back oil pumps (it's a PIA) did do so with filters making back to back runs on the dyno.
Replacing WIX racing filter with screen type filter lowered oil pressure gained 3-4 HP. Even though the paper filter "average" opening is 65 microns a 30 micron medical grade stainless steel screen released power.
Low load low drag oil pump screened filter effective windage control and what ever crankcase vacuum you can build legally will release power.

[Jeff Niceswanger]

While on Dave Layers dyno several years ago we broke off the oil pump pickup. Had around 3 psi for the entire pull as it went unnoticed. Yes Dave was red faced about it. I always believed in Amsoil after that. As the bearings looked absolutely brand new afterwards. There was 4 to 5 difference in the previous pull and the one without the pump pulling against the engine .. So if your cutting it from 80 to 50'ish I don't know, but less that that ....,,,,

[MR DERBY CITY]

A very respected engine builder was making Dyno pulls on a customers 305 stocker motor. At the end of the day they drained all the oil out and made a pull. It was 8 HP better. The names are intentionally withheld to protect the innocent….

[GUMP]

Originally Posted by marvstrick

How much hp will 80 lbs oil pressure rob in stock 305 gm stocker

Some........but, we don't race dynos....

[Signman]

If you have chased the large HP gains and now searching the small gains consider this:
Low load, low volume, pressure recovery oil pump with micro polished pump gears and screen oil filter does reduce load plus will help flow, reduce cavitation and free up HP. All positives don't know the real gain but do know a prestigious stock engine builder did the tests years ago and was modifying oil pumps on his engines. Was tutored by a former stock engine builder who had a fixture to test oil pumps and oil 30 years ago. You probably know getting the oil level as far away from the crank as possible will show a large gain.
Consider this: Any engine with distributor driven at the back of the cam load on that gear driving the oil pump AND distributor should see reduced loading/unloading from the bypass open/close plus overall load will be less. Do ya think would make timing more accurate plus contribute less to valve train harmonics for gains in a couple more areas??

[Lee Valentine]

In the days of heavy oil,10w40 saw 10 horsepower with hollow filter.