Oil pressure problem on cammed M6

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Jun 13, 2011 | 07:48 PM

philsblwnz28

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From: Kissimmee

Oil pressure problem on cammed M6

Ok, a buddy of mine has a 99 Z28 with 243 heads, 224/230 cam, stock bottom end. He said that lately he has noticed the oil pressure has dropped some. Does this look normal after running for 30 minutes?

Jun 13, 2011 | 07:53 PM

BigBirdLS1

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If he revs it does the oil pressure drop down then spike up or does it go straight up drom there. Did he change oil types or weight? I think the old rule is 10psi per 1k rpm so he should be fine. Besides the gauges on these cars aren't known for their accuarcy.

Jun 13, 2011 | 08:00 PM

philsblwnz28

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From: Kissimmee

The oil pressure goes straight up and he is using 10w 30 mobil 1

Jun 13, 2011 | 08:01 PM

NVR_SPDS

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From: Virginia

try swapping out the switch, and see if the reading changes.

What kind of pump, and what kind of mileage does it have on it?

Jun 13, 2011 | 08:16 PM

philsblwnz28

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From: Kissimmee

the pump has 10k on it, the pump is a high volume pump.....(dont recall name

Jun 13, 2011 | 08:36 PM

NBM-LS1

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From: STL, Mo

replace the sending unit or check oil pressure with a mechanical gauge to check accuracy.

Jun 13, 2011 | 09:00 PM

Juve PS

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From: Phoenix

I have the same problem with my T/A, and after a while the needle goes down to the red line. I know for sure it has plenty of oil and I also replaced the sending unit and it didn't fix the problem... Please help me too!

Last edited by Juve PS; Jun 13, 2011 at 09:02 PM. Reason: added pic

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Jun 19, 2011 | 09:51 AM

Darkman

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From: Spring, Texas

in addition to sending units, check the grounds (star washers are your friend) - starting the negative battery post which the system uses for reference values.

Jun 19, 2011 | 05:29 PM

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408ws6ta

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cold start its around 35psi on the gauge. once hot its around 17-20psi.
Im going to change the oil and filter to 10w-40 and see what it does.

I just got the car so I dont know much about the motor other than its an iron block 408 stroker...