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Old 10-16-2008, 03:34 PM
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Oil Pressure on chevy 383

Just curious what other's opinions on what oil pressures to expect on a recent 383 (idle to 4000 RPM)

1. 7 qt oil pan
2. 99% sure high volume oil pump
3. running 10W40
4. ~600 miles on build
5. recently installed oil pressure gauge

I've read that stock conditions (chevy 350) that 10PSI per 1K RPM is typical; however with my conditions I am getting much higher oil pressure than expected.

Thanks.

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Old 10-16-2008, 04:41 PM
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oil pressure....

hi,what is youre oil pressure guage reading at,1,2,3 and 4,000 RPM ???how much pressure drop do you get when the engine is warm?
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Old 10-16-2008, 04:51 PM
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If the clearences were set correctly on the rod and main bearings a high volume pump is not needed. A SBC has one of the best designed oil systems ever. The high volume pump only requires more power to drive. I would go back to a stock melling replacement oil pump and leave it at that.
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Old 10-16-2008, 04:53 PM
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not to worry on my 406 Ill get 45 psi to 50 psi on startup.
thats a good thing !
after warm up itll be anywhere from 30 to 40 psi at idle with max pressure at 6500 rpm at 55 psi
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Old 10-16-2008, 04:55 PM
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I am guessing it is a high volume oil pump based on the pressures. I just installed the oil pressure gauge after a recent intake manifold gasket swap so I have nothing to compare to). While I was at it I changed the oil with 10W30 hoping to help with some blow by issues I may be having. I only drove the car for a few minutes around the block but the pressure was in the 75 PSI range and started to go down to maybe 70PSI as it warmed up. Today I will pay more attention of pressures at different RPMs and cold vs warm. Thanks.

As far as the clearances I can only assume they were checked. It has a completely new eagle bottom end.
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Old 10-16-2008, 05:39 PM
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20-30 hot idle psi is normal

From there, 10 psi per thousand RPM is all you NEED, but more is expected. As long as you're not going over about 80 psi at any time you should be fine. 10 per thousand is a minimum safe level. Anything over 80-90 and you're just bypassing the filter (or potentially exploding the filter) That leaves a grey area to play with. Fresh builds should be on the upper end of that grey area so as they wear you still have adequate pressure, but any more than you need and its just wasting HP and stressing the oil pump drive.

My latest small block build makes 22 hot idle, and about 60 psi at 5000 hot. That is a marine build with looser bearings and 20w50, but that's right on target.
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Old 10-16-2008, 07:35 PM
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Curtis......"Hates Liver and Lima Beans"????????????? Lima beans!!! Dude! My favorite!!!! Yum yum!!
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Old 10-17-2008, 12:17 AM
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Quote:
Originally Posted by Jmark
Curtis......"Hates Liver and Lima Beans"????????????? Lima beans!!! Dude! My favorite!!!! Yum yum!!
I'm sorry, I can't talk to you. I just don't trust anyone who likes Limas

I'm actually going to change that headline because it makes me sound like I'm a picky eater. Truth is, I am a very adventuresome eater. Its just that I've tried Lima beans and I just don't like them.

My mom used to make that Succotash with corn and limas... what a perfectly good way to ruin corn
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Old 10-17-2008, 12:20 AM
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There, is that custom title better?

Its a shame we don't have a smiley that is something like :buttkisser:
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