Oil Pressure ?
Thread Starter
Racer
Joined: Oct 2007
Posts: 284
Likes: 6
From: Palm PA
Oil Pressure ?
What do you feel the proper oil pressure should be? The old 350 I had required 20/50 oil to get 25 lbs. at idle and 35 lbs at 3000 rpm. (Yes the bearings were shot). I'm running 10/30 in my new 383. It has a stock oil pump. I get 70 lbs + at start up, 35 lbs at idle hot and 65 lbs at 3000 hot. I feel a lot better with the higher oil pressure or this a little on the high side? I could use 5/20 oil to lower the pressure. What do you think? Thanks
68 Vetteman
68 Vetteman
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
It would help you to know exactly what pump you have, but if it is a stock Melling m55 (most are) then you most likely have a 60psi relief spring.
Just adjust your oil viscosity, so that the pressure (with accurate gauge)
stays below that pressure for 99% of engine running when at temp and rpm.
Running over relief raises oil temp drastically, and one of the purposes of the oil is to carry heat from the bearings.
Just adjust your oil viscosity, so that the pressure (with accurate gauge)
stays below that pressure for 99% of engine running when at temp and rpm.
Running over relief raises oil temp drastically, and one of the purposes of the oil is to carry heat from the bearings.
