HP

Signman · 09-06-2021, 10:17 AM

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 · 09-06-2021, 07:29 PM

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 · 09-06-2021, 08:45 PM

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….

09-06-2021, 10:17 AM	#1
Signman Senior Member Join Date: Oct 2003 Location: Lower Slower Delaware Posts: 535 Likes: 22 Liked 269 Times in 99 Posts	Re: HP 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. __________________ Frank Ferrucci I/SA 1271 "Be Thankful for the Gifts You are Given"

09-06-2021, 07:29 PM	#2
Jeff Niceswanger Senior Member Join Date: Jul 2003 Posts: 894 Likes: 686 Liked 1,034 Times in 368 Posts	Re: HP 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 ....,,,, __________________ Jeff Niceswanger 3740 SS

09-06-2021, 08:45 PM	#3
MR DERBY CITY VIP Member Join Date: Feb 2014 Location: Derby City, USA Posts: 3,641 Likes: 1,083 Liked 7,945 Times in 1,521 Posts	Re: 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….