oil pressure
 

Can someone please help me out on this one. Mainly, I have a 1st gen with a 13b streetport and just switched to a 79 oil pressure regulator shimmed for higher pressure with the front cover’s oil by-pass shimmed as well. While warming up or with the engine cold, I can get over 80 psi. I know that the oil thins out by appx 10psi but how come the most I get is about 50-60psi once the oil temp increases to 160*F. do I need to change the oil pump or is this normal.

Thanks.

i have an 85 GSL-SE and the oil pressure generally stays between 55-60 psi at an rpm range of 2500-3000. this is using 10W-30. It does increase to over 60 when rpms climb over 3500. I have driven it like this for a year without any problems. Using 20W-50 might increase the oil pressure a bit. I did see pressure drop to 50 psi at higher rpms when i had a leaky oil cooler. So you don't need to worry too much about it.

rxseven
i just became very concern as the racing beat articles about the oil pressure exceeding 71psi above 3000 rpm. thanks for that info.

Mine will go up around 70 psi when cold but definately wants to settle around 60psi when hot. the haynes manual says 62-84 psi at 3000 rpm. I am not sure if that applies to only 12A motors or not. I read some info on atkinsrotary.com which said the bare minimum pressure reqd was 15 psi. What weight oil are you using anyway?

im using castrol 20/50 with autometer mechanical oil pressure/oil temp/water temp gauges. the stock pressure gauge have same reading as the autometer.

Any chance of a pressure loss accross the oil cooler? what is the oil pressure at idle when warmed up?

no leak on the oil cooler nor the lines at all. oil pressure at idle when cold is 50 and at 2500 rpm - over 100ps. idle when warm 20psi @ 950 rpm.

speedy,
ck out oil system