Oil pressure
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Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
Oil pressure
88 F350-sourced engine, I recently put an oil pressure gauge on it and I'm not thrilled with the results. The original truck had an idiot gauge, so I didn't see the pressure before, but now it maxes out at 38psi. Hot at idle it'll drop as low as 12-15, but climbs back to 38 as the rpms increase. What should I see for pressure on this engine?
I am running Royal Purple, a Motorcraft filter, and measuring at the top port behind the intake.
I am running Royal Purple, a Motorcraft filter, and measuring at the top port behind the intake.
Senior User
Joined: Feb 2012
Posts: 445
Likes: 6
From: western Oregon
Most people will freek out when they finaly put a real oil pressure gauge on a IDI. The international book says 40-70 at 3000 rpm is normal. I will be using a few tricks to increase my oil pressure on my engine because I am one of those people that thinks 10 lbs per 1000 rpm HOT is the minimum for most engines. And on one that you are pushing past its normal power output could use a little more for good bearing life. Just my 2 cents. I know IDI's have huge gear driven pumps that move alot of oil compared to most gassers but somtimes I just cant feel good about a 8-12 psi idle. It just don't seem right.
i ain't rite
Joined: Mar 2005
Posts: 65,481
Likes: 5,542
From: Marlboro Mental Hospital.
10 at idle and 25 at speed is fine. diesels need volume not pressure.
80 lbs pressure at 2500 rpm with 2 gph oil flow will sieze the engine.
20 lbs pressure at 2500 rpm with 100 gph oil flow and it will run forever.
80 lbs pressure at 2500 rpm with 2 gph oil flow will sieze the engine.
20 lbs pressure at 2500 rpm with 100 gph oil flow and it will run forever.
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