C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Oil Pressure Problem

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Old Jul 23, 2010 | 12:32 PM
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Default Oil Pressure Problem

I have an oil pressure problem. When you hit it, the pressure holds for a second and drops.

I used to have a deep pan and changed it to the stock pan and the oil pump. New Melling pump installed with standard pressure and volume. Same problem.

A way to make it better is to switch from 5W30 to 10W30 oil. It holds more steady but it will drop after a few seconds to maybe 15 psi.

Is it the filter as some have suggested? I am using Mobil 1 oil and AC Delco filters. Everything else about the oiling system is the same.

If it is really sucking too much oil, why was it the same with the deep pan that held 6-7 quarts?
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Old Jul 23, 2010 | 02:18 PM
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What year is your car? The LT1's have a pressure regulator in the oil pump and if the spring is weak, it could cause a drop in pressure.
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Old Jul 23, 2010 | 02:20 PM
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91. Even if it weakened, the new pump from Melling should have taken care of it.
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Old Jul 23, 2010 | 02:42 PM
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The pick-up should be located 3/8" from the bottom of the pan, is there a possible pickup to pan distance issue?
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Old Jul 23, 2010 | 02:47 PM
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Originally Posted by bjankuski
The pick-up should be located 3/8" from the bottom of the pan, is there a possible pickup to pan distance issue?
Don't think so since I saw it done. They used something soft to check. Clay, maybe.
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Old Jul 23, 2010 | 11:07 PM
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Definitely seems like the pick-up is getting un-covered.

Was the pick-up level with the sump of the pan?

Is it the stock configuration?

Was it brazed on to the pump body?

Correct oil level?

Bearing clearances?

Did anyone remove the pump cover and check the gears to pump and gears to end plate clearances?

Just some things to consider.

Jake
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Old Apr 24, 2012 | 10:28 AM
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I have the same issue, i have been through 2 different pants and 2 different pumps, i am starting to lean towards the gadge or the sending unit
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Old Apr 24, 2012 | 01:00 PM
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I would check the oil pressure to verify that it is low first. Might just be a faulty gauge.

You should start your own thread and link back to the old one for clarification as this thread will be locked down soon.

IBTL
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Old Apr 25, 2012 | 03:27 PM
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Originally Posted by aklim
I have an oil pressure problem. When you hit it, the pressure holds for a second and drops.
Does it only do this when the oil and engine are warm?

Originally Posted by aklim
I used to have a deep pan and changed it to the stock pan and the oil pump. New Melling pump installed with standard pressure and volume. Same problem.
Did you change the pickup to match the standard pan and not the deep pan? If it's too close to the bottom, the suction can create a low pressure area and the oil can actually vaporize (similar to boiling but it's due to the low pressure in the suction area that causes it to "flash vaporize").

Originally Posted by aklim
A way to make it better is to switch from 5W30 to 10W30 oil. It holds more steady but it will drop after a few seconds to maybe 15 psi.
The 5w vs 10w has more to do with the coldest recommended temperature where that oil stays thin enough to pump through the engine on a cold start. However, it also can have an impact on the viscosity additive package in the oil and that could be related to an issue with the pickup being too close to the bottom of the pan.

Originally Posted by aklim
Is it the filter as some have suggested? I am using Mobil 1 oil and AC Delco filters. Everything else about the oiling system is the same.
Unless you have a single bad filter (have you changed it?), I doubt it's filter related. You could have a weak bypass spring, or a bypass that's getting stuck open (it's under the oil filter in the filter adapter that's bolted to the block). They are cheap enough, I might consider changing it.

Originally Posted by aklim
If it is really sucking too much oil, why was it the same with the deep pan that held 6-7 quarts?
That still makes me think it could be a problem with the bypass in the filter adapter (or both pans had the pickup too close to the bottom).

Just my thoughts.
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