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Losing oil pressure after run

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Old 05-28-2007, 12:13 PM   #1
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Default Losing oil pressure after run

At the end of a run, when I let off, I lose oil pressure breifly and it then comes back. I have tried the stock LS pan, and two different pans with all kinds of baffles and trap doors. Pickup height is correct. Adding oil does not seem to help. I have run as little as 4qts and as much as 6 qts. It has great oil pressure thoughtout the run and any other time. Has anyone run into this before? Has anyone restricted the pickup tube to control the oil flow?
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Rich
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Old 05-28-2007, 07:28 PM   #2
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An accusump would work, have you tried restricted pushrods?
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Old 05-28-2007, 07:50 PM   #3
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Accusumps not allowed in our class. Yes on the top end oil restriction.

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Old 05-28-2007, 07:52 PM   #4
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Do you think you might be "burping" some oil through the PCV because of pressure buildup in the crankcase after each run? Just a thought that comes to mind..
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Old 05-28-2007, 08:00 PM   #5
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I don't think that can cause a pressure problem but you are making me think about some of the top end venting.

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Old 06-01-2007, 06:01 PM   #6
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A lot of super stock sbcs see the same thing. One friend tells me with the water-weight synthetic oil that is not so pronounced with his car. Faster drain-back maybe? I'm suprised more oil doesn't help.
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Old 06-02-2007, 03:06 PM   #7
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Ive had alot of oil pressure problems with the stock pans.This year i went to a moroso and all my probems went away.The moroso has a rear sump that is included with the pan and it also holds 8qts not 6qts like they advertise.
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Old 06-02-2007, 03:33 PM   #8
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Thanks guys. I have been away from my computer for a couple of days.
Our LT1 Stockers and Super Stockers do not have this issue at all.

I do not believe the Moroso pan is appoved for NHRA Stock. I would hate to run that much oil.


Rich

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Old 06-13-2007, 12:46 AM   #9
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I had a simular issue that went away after going to a thinner oil. I know it isn't anything you haven't thought of, but I just thought I'd mention it again. Also I know Harland was having som problems with oil moving up the back of the block on one of there cars that was launching with a Trans Brake so you might just contact him also. Y2Khawk is his name on here if you don't know him. Good luck.
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Old 06-13-2007, 09:48 PM   #10
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Thank you!
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Old 06-13-2007, 09:48 PM
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