oil pressure

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Jan 24, 2007 | 09:52 PM

patrickd

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oil pressure

I need to know what the average hot idle oil pressure is for an lt1 c4. I'm looking to buy, and am checking out a 94 with > 80K miles, which the owner says has about 20 psi at idle. I don't know much about lt1's, but was a little surprised since my ls1 fbody is around 40 at idle. Thanks.

Jan 24, 2007 | 10:01 PM

bogus

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From: San Pedro CA

that is fine. the older LT1 style small block needs about 10psi per 1000 rpm.

check the gauge, he may be mis-reading it.

Jan 24, 2007 | 10:10 PM

cv67

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From: altered state

St. Jude Donor '05

20 is fine for a non LS motor.
, LS1s seem to have quite a bit more at idle. I have an 81k mile 5.3 LS motor that makes 45 psi@450 rpm in drive.

Jan 24, 2007 | 11:58 PM

90Z51

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From: Seattle WA

The oil pressures on LT1 cars are bizarre. It's acceptable to have 6psi at 1000RPM.

Jan 25, 2007 | 01:35 AM

vader86

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20s is fine if the engine is hot.

Jan 25, 2007 | 05:32 PM

dan_t

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From: BC

im showing arond 45psi @ idle when up to temp on my L98.

Its had a new oil pump and new mains and ends but its an 85 block.

Think its telling me lies?

Last edited by dan_t; Jan 25, 2007 at 06:00 PM.

Jan 25, 2007 | 05:42 PM

Corvette Kid

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Quote:

Originally Posted by 90Z51

The oil pressures on LT1 cars are bizarre. It's acceptable to have 6psi at 1000RPM.

It is? While I'm not an advocate of excessive oil pressure, (waste of HP) that is a bit low. Where did you come up with that number? Mine is not stock and I pay no attention to stock specs on this. My clearances are by design a bit looser than stock too. At full oil operating oil temperature, mine idles at 15-20 PSI and cruises at around 40 or so. It increases at higher RPMs. This is with 5-30 synthetic and a blueprinted high pressure (but not high volume) pump.