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Old 09-09-2012, 07:30 AM   #1 (permalink)
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how much oil pressure is to much

help have been looking for normal oil pressure for 1989 ford 302 eng i now have 60psi on stock eng was thinking it should be around 30 psi what is the right oil pressure thanks
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Old 09-09-2012, 08:08 AM   #2 (permalink)
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Re: how much oil pressure is to much

Oil pressure varies alot due to temp and rpms as well as the weight of the oil you are running..It would be helpful if you listed your pressures at cold and hot temps and also at what rpms?..Of course if the engine has been rebuilt and is running an aftermarket oil pump that can change pressures as well...If your running 60 psi with a cold engine I would say that is pretty normal..
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Old 09-09-2012, 09:03 AM   #3 (permalink)
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Re: how much oil pressure is to much

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Originally Posted by #1spudman View Post
help have been looking for normal oil pressure for 1989 ford 302 eng i now have 60psi on stock eng was thinking it should be around 30 psi what is the right oil pressure thanks
hot or cold . at idle or 10Krpm ?
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Old 09-09-2012, 11:19 AM   #4 (permalink)
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Re: how much oil pressure is to much

The Right oil pressure is anything that keeps your engine lubricated safely at any rpm.

Nominally 10 psi per 1000 rpms. That's about as undiluted an answer as can be given...
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Old 09-10-2012, 08:41 AM   #5 (permalink)
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Re: how much oil pressure is to much

And since oil pressure is just an indirect measurement of how much oil leaks past your bearings, bearing clearances have a huge impact. My own 1989 302 with 10W-30 oil is 55 psi cold, 35-40 psi hot, at 2000 rpm where the Ford service manuals used to tell you to check at.
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Old 09-10-2012, 11:34 AM   #6 (permalink)
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Re: how much oil pressure is to much

JC allison's 200,000 + mile 390 in the great Mrs. American PI had 90 PSI at cold idle and more than 60 at HOT idle. And it's got more than 100,000 miles since it's rebuild back in 1986.
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Old 09-10-2012, 01:15 PM   #7 (permalink)
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Re: how much oil pressure is to much

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Originally Posted by FEandGoingBroke View Post
JC allison's 200,000 + mile 390 in the great Mrs. American PI had 90 PSI at cold idle and more than 60 at HOT idle. And it's got more than 100,000 miles since it's rebuild back in 1986.
Now that is definetely NOT normal.
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Old 09-12-2012, 07:05 AM   #8 (permalink)
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Re: how much oil pressure is to much

thanks i had just got it runing it had ben setting for a long time it was cold eng ran it for 5 min and was at 60psi 10w 40 oil have not turned wrenches for a long time and its good to be back to turning them agin just forgot some of the things its ben some thing like 20 years or so and i have ADHD and copd now and old age too its comeing back a little at a time i will make it thanks for all the help #1spudman
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Old 09-12-2012, 09:06 AM   #9 (permalink)
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Re: how much oil pressure is to much

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Originally Posted by frdnut View Post

Now that is definetely NOT normal.
All depends on the type of oil pump (HI-PRESS/HI-VOL/Both) and how tight the engine was assembled. Remember, JCs' is a Police Engine also while 90 cold is a bit much but the engine does a have pressure relief valve (HP).

You need to plot a graph (cold and hot) of pressures at different RPM'S.

30 @ idle and 60 under load is a damn healthy engine (IMO).
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Old 09-12-2012, 05:00 PM   #10 (permalink)
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Re: how much oil pressure is to much

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Originally Posted by KULTULZ View Post
All depends on the type of oil pump (HI-PRESS/HI-VOL/Both) and how tight the engine was assembled. Remember, JCs' is a Police Engine also while 90 cold is a bit much but the engine does a have pressure relief valve (HP).

You need to plot a graph (cold and hot) of pressures at different RPM'S.

30 @ idle and 60 under load is a damn healthy engine (IMO).
I agree!
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Old 09-13-2012, 02:46 PM   #11 (permalink)
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Re: how much oil pressure is to much

I'd say the only real qualifier of "too much" is:

A) if you snap your pump shaft
B) If you pop your galley plugs out
C) If you pump your pan dry
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Old 09-13-2012, 05:14 PM   #12 (permalink)
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Re: how much oil pressure is to much

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Originally Posted by thekingofazle View Post
I'd say the only real qualifier of "too much" is:

A) if you snap your pump shaft
B) If you pop your galley plugs out
C) If you pump your pan dry
I would add:

D) If your distributor gear or cam gear show excessive wear
E) If you mind wasting fuel making horsepower to pump more oil than it needs
F) If you don't want to add any more excess heat to your oil
G) If you don't want to add additional oil drag to your windage at high rpm
H) If you don't want to add additional load or drag to your piston oil rings
I) If it ever exceeds the working pressure of your oil filter or gasket

David
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Old 09-14-2012, 06:02 PM   #13 (permalink)
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Re: how much oil pressure is to much

Also, high pressure/flow for whatever reason when cold will open the filter bypass if pressure differential exceeded. This may not be considered desirable. Another thing, in colder climates where oil thickening is common, even with the bypass open, the differential may exceed the structural capability of the element causing it to distort or crush. This usually goes undetected since few people cut open their filters to inspect. Synthetic oils can reduce this.
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Old 09-15-2012, 05:28 AM   #14 (permalink)
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Re: how much oil pressure is to much

And this is why engine lubrication design is different between passenger car and HP/Police engines. One must understand the ramifications of modifying.
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Old 09-15-2012, 09:02 AM   #15 (permalink)
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Re: how much oil pressure is to much

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Originally Posted by KULTULZ View Post
And this is why engine lubrication design is different between passenger car and HP/Police engines. One must understand the ramifications of modifying.
what is the difference klutz in the oiling systems ?
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