Oil Pressure fe 390

MaSnaka · #1 (**permalink**) 03-02-2006, 10:52 AM

I have not learned trial by fire that I think most of you guys have. My high performance experience is somewhat novice. I purchased a used Cobra with a rebuilt fe 390, had it in the shop getting some clutch work done and the mechanic said my oil pressure was questionable...at cold idle it would read just over 25 lbs and not move significantly up or down with engine temperature or RPM fluctuations. I checked the guage which seemed ok, replaced the oil pressure sending unit, no change there. So I replaced the oil pump with a high volume pump and now have 50 lbs at cold idle and at 190f engine temp it will gradually drop to 30 lbs as the oil heats up. The pressure doesn't change if I'm idling or at freeway speed when the engine is warm. Should I be concerned or is the pressure I have adequate? I get different opinions depending on who I ask. Your help and advice please. Thanks!

John
Classic Roadster
Silver no stripes

RedCSX1 · #2 (**permalink**) 03-02-2006, 11:36 AM

10 pounds for every 1000 rpms. Need high pressure pump not high volume. Look to Precision Oil Pumps for a good pump to fit your motor.

SCOBRAC · #3 (**permalink**) 03-02-2006, 01:11 PM

Your oil pressure is fine. completely normal. If you want to raise it a little run a high grade 20/50 or 40 weight oil.