High oil pressure?

Ed Wright · 06-29-2011, 02:35 PM

Charles, I have Honda rod bearings, std 350" mains and .904 lifters (bushed bores) in mine, and use a pump with shortened gears with a "stuffer" plate to cut volume. With zero wt oil it idles about 15 psi hot, goes to 40 by 2500 RPM. Cold it idles close to 40. Idle speed is 1600.

I don't think sharing what we have learned is stepping on toes.

Take care, Ed

Pvt Parts · 06-30-2011, 05:47 PM

Quote:

Originally Posted by Ed Wright

Charles, I have Honda rod bearings, std 350" mains and .904 lifters (bushed bores) in mine, and use a pump with shortened gears with a "stuffer" plate to cut volume. With zero wt oil it idles about 15 psi hot, goes to 40 by 2500 RPM. Cold it idles close to 40. Idle speed is 1600.

I don't think sharing what we have learned is stepping on toes.

Take care, Ed

What is it at the finish line?? My Corvette was dancing between 40 and 60 at 1000 feet when the car was on kill. Clutch it and kill it at the finish line or it would go to zero.

Ed Wright · 06-30-2011, 06:16 PM

Quote:

Originally Posted by Pvt Parts

What is it at the finish line?? My Corvette was dancing between 40 and 60 at 1000 feet when the car was on kill. Clutch it and kill it at the finish line or it would go to zero.

40 psi at the finish line, drops to 25 or so when I put it in neutral (clean neutral Rossler) unless it has zero wt oil, then drops to about 15. 10W30 cold idles at 40. I can't tell much difference watching the gauge between this pump and my old Moroso pump with the 40 psi spring.

Charles Rainey · 07-02-2011, 10:32 AM

Carl
You cant be 51 years old. You been doing CNC crap for more years than that. Yep HeHaw
ED
I, just as you do, dont want any more than 40 psi but I do it differently. Like I said, many ways to skin a cat. I use a slightly larger pump and then dump extra back to pan down the back of the pan. I never see a drop in pressure at the end of a run(unless I run 3 quarts). I use a set screw on the spring to set the pressure to dump. I mill a slot so that if pressure builds up, as the unloader moves back it will uncover more slot and dump to pan. It takes very little HP to turn a oil pump dumping to pan, but it does take HP to turn a pump dead heading to bypass in its self. Man it doesnt mean I know any more than you do, I just do it differently. Probably same end result
cheers tall

carl hinkson · 07-02-2011, 01:40 PM

Quote:

Originally Posted by Charles Rainey

Carl
You cant be 51 years old. You been doing CNC crap for more years than that. Yep HeHaw
ED

Only have been CNC machining blocks for 11 years or so.

06-29-2011, 02:35 PM	#1
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: High oil pressure? Charles, I have Honda rod bearings, std 350" mains and .904 lifters (bushed bores) in mine, and use a pump with shortened gears with a "stuffer" plate to cut volume. With zero wt oil it idles about 15 psi hot, goes to 40 by 2500 RPM. Cold it idles close to 40. Idle speed is 1600. I don't think sharing what we have learned is stepping on toes. Take care, Ed __________________ Ed Wright 4156 SS/JA

07-02-2011, 10:32 AM	#4
Charles Rainey Junior Member Join Date: May 2011 Posts: 40 Likes: 0 Liked 0 Times in 0 Posts	Re: High oil pressure? Carl You cant be 51 years old. You been doing CNC crap for more years than that. Yep HeHaw ED I, just as you do, dont want any more than 40 psi but I do it differently. Like I said, many ways to skin a cat. I use a slightly larger pump and then dump extra back to pan down the back of the pan. I never see a drop in pressure at the end of a run(unless I run 3 quarts). I use a set screw on the spring to set the pressure to dump. I mill a slot so that if pressure builds up, as the unloader moves back it will uncover more slot and dump to pan. It takes very little HP to turn a oil pump dumping to pan, but it does take HP to turn a pump dead heading to bypass in its self. Man it doesnt mean I know any more than you do, I just do it differently. Probably same end result cheers tall