HP
 

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

Re: HP
 

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.

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Zero... been there done that

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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

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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.

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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 ....,,,,

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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….

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

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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??

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

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I did machine / hydraulic design before I retired, GPM x PSI divided by 1714 gives you the HP required. Flow is going to vary with rpm but 10 GPM at 80 PSI is only about .5 HP. Even if the pump is only 50% efficient it's only 1 HP. I've never measured the pump flow but regardless I don't see the HP being significant.

Jim Mantle V/SA 6632

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There may be other factors that add to the results of lowering oil pressure or volume in a race engine that the engine dyno does not see. Most sportsman engine builders use 300 RPMs per second as the "rate of acceleration" as a standard. You may not see much if any difference, from standard tension rings vs low or light tension rings for instance on a dyno at 300 RPMs/sec. As a typical SBC stocker engine leaving the line will see 500-600 RPMs/sec or more. Oil pressure and/or volume may see some of the same results on the dyno, but may be quite different on the race track, because the dyno may not replicate the "rate of acceleration" as in the real word. Decreasing oil pressure to a point may be the point where there is less oil flooding the cylinder walls so those light tension rings can show their benefit, there may be less oil dropping on top of the crankshaft and camshaft adding to the windage issues and robbing horsepower, let alone unnecessarily flooding the valve covers. If oil pressure was not an issue in a race engine, companies such as Melling's shark tooth pump and Schumann's modified pumps would not show their benefits and therefore racers and engine builders would not buy them if there was no Gain. A good way to tell the benefits of your max effort engine on the dyno is run it as usual at 300 RPMs/sec and at the end of the session run it at 600 rpms/sec and see the difference. You will normally 'loose HP', but the less you loose, the more benefit you will see at the racetrack.
On the other side of these statements, I have tested oil pressure on the dyno on a purpose built dyno competition engine with external adjustable oil pressure with horsepower in the 700 range with 10w-30 oil. The results from those test showed that reducing oil pressure 5 lbs was 5 hp gained, 10 lbs lower was a 10 hp gain...your results may vary!

Tom Hestness

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Many time record holder for many races watched me work on my car to make it faster. Working on many areas some which should have been significant but no ET. After the 3rd conversation where he repeated you need horsepower then all you work will show up on track. Having exhausted most of what could be done other than a better engine stepped up to the plate opened my wallet & ears took a year off to get it together. Afterword all the ET showed up.


Back when was talking with Vern about his energy recovery system he justified it with feedback from his LS pump development with an engine masters project. Remember him mentioning how deep the oil pan was and how his system maintained the oil column in the long pickup tube. He was talking about a large hp gain at that power level.

Do I think it will pick up the same on a stocker engine? Probably not especially the low hp combinations.

Would the power gain be linear? Possibly.

What am confident in there is a significant gain plus other small benefits in other areas add up combine gains from thin rings and gas ported spacers will pick up significant power which will show up on the track.

It does come at a price and a good amount of fabrication.

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What brand of pump or who is the go to for NON LS SBC oil pumps stock and Superstock besides Schumann these days?