LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Low oil pressure

Old Mar 4, 2010 | 05:49 PM
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Default Low oil pressure

I went to start my car yesterday to let it idle, and I noticed that it was only running about 18 psi. When I would rev it to 4.5k real quick it would jump to about 42. The oil is on the second dot on the dipstick, so I know it is not low. Is this number low, or is it ok? It runs just fine. That number just seemed low to me. Thanks in advance for any help!
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Old Mar 4, 2010 | 05:51 PM
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Is that 18psi on a cold start up?
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Old Mar 4, 2010 | 05:55 PM
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After running for about 25-30 minutes. Temp was at 210 or so.
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Old Mar 4, 2010 | 06:01 PM
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Ya thats a lil on the low side. Try changing your oil and filter.
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Old Mar 4, 2010 | 06:06 PM
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18 is pretty good for our cars, mine runs at 7-8 psi at normal operating temp
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Old Mar 4, 2010 | 06:13 PM
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IDK maybe its just me but mine dosn't idle that low. I was thinking about 25 would be a nice healthy engine but as long as oil pressure gose up w/ the RPM's I think its will be fine.
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Old Mar 4, 2010 | 06:23 PM
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It also has a pretty bad oil leak. It left spots that would be al together about the size of 5 quarters. It only leaked out about 1 quarter when it had been sitting there for two months though. Do you think that it is leaking that much because of a leak that has some pressure behind it?
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Old Mar 4, 2010 | 06:26 PM
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That was just over a period of about 30 minutes when it left that much oil

Last edited by Slow94Formula; Mar 4, 2010 at 10:56 PM.
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Old Mar 4, 2010 | 06:49 PM
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the rule of thumb was 10psi per 1000 rpms.
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Old Mar 4, 2010 | 07:17 PM
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GM spec is 6psi at idle and (as litch2004 mentions) 10psi per 1000rpms.
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Old Mar 4, 2010 | 07:22 PM
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I wouldnt worry about it as long as it build psi while you driving, it should rise and fall as the engine rev's basically.

I see about 20 psi on mine (hot temp) and I have a rear main leak to, so I leave qtr drops on the ground also.
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Old Mar 4, 2010 | 07:34 PM
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Ok, thanks guys. I was worried when a friend of mine told me that was really low. I guess if that is typical for an LT1 I won't worry too much then.

Last edited by Slow94Formula; Mar 4, 2010 at 10:55 PM.
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