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01-03-2003, 01:45 PM
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Low oil pressure?
I have a 289 that my Uncle and I recently rebuilt. All machine work was done at a very reputable shop. Never checked my oil pressure with a mechanical guage before, but here's what my new rebuild has after 2000 miles using 10w-40 valvoline. I am wondering if this is normal, or if I have a problem somewhere.
Cold 2000 RPM = 45 - 50 psi Cold idle in gear, brake on = 30 psi Hot 2000 RPM = 30 - 35 psi Hot 4000 RPM = 40 - 45 psi Hot idle in gear, brake on = 18 psi I have a stock volume Sealed Power oil pump with chromoly drive shaft. I think all the pressures are fine, but the hot idle pressure seems low? Reason I ask is because I have some slight valvetrain ticking noises at hot idle when the engine is really warm, like after freeway driving. Not sure if I need to re-adjust my rocker arms, or if it's caused by oil pressure, or lack of. Thanks. 
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01-03-2003, 02:14 PM
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think of it this way IF you have an idiot light it would come on at 6 to 7 lbs. Iwouldnt be happy with 18 eather but try adj. valves and see if oil psi improves. If not install high vol. pump.
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01-03-2003, 04:28 PM
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I think that's enough oil pressure. With the stock pump, and if your bearing clearance is maybe on the high limit, you won't have tons of oil pressure, but you don't need it. 18 PSI idling hot is all you need. 45 PSI at 4500 is plenty also. More pressure absorbs more horsepower.
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01-03-2003, 04:34 PM
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My engine teacher tought us that 10 psi per 1000rpms is more than enough. In fact, pro racers don't even use high volume oil pumps, they use blueprinted stock pumps. This way they will flow a little more than stock, but won't rob all that power like a high volume pump. Your oil pressure is fine.
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01-03-2003, 04:59 PM
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I wouldn't worry about it if I were you, funny
thing about Ford engines, they don't mind low oil pressure as much as Chevy engines...If you're really worried about the low oil pressure, raise the idle speed. My daily driver has less than you've got hot, and has been that way for a couple of years, I keep thinking it's time to rebuild, but the damn thing runs so well...
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01-03-2003, 11:08 PM
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Thanks. I thought it was probably OK, but just wanted some opinions from others with more experience. Thanks again.
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