Low oil psi on a 327 - Team Camaro Tech
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post #1 of 10 (permalink) Old Nov 10th, 05, 11:28 AM Thread Starter
 
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Low oil psi on a 327

Hi folks, I have a 327 210 HP that runs smooth, burns no oil, has good comp. no blowby etc, however it runs 15 to 20 psi cold, and when hot, about 5 psi, this is at idle, if you drive it and rev it, it will go upwards of 25 psi, this seems low to me, I like to see 40 at cold idle and 35 warm driving around.
It has mobil1 15w 50 in it now, I'm thinking perhaps a worn oil pump? or the pickup screen has fallen off, any other ideas of what it could be? I do not know the history of the engine, but it runs very smooth with no smoke and well decent power for a little 2 barrel small block.
Help!

Jeff
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post #2 of 10 (permalink) Old Nov 10th, 05, 02:57 PM
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Re: Low oil psi on a 327

I assume it is an electrical gauge. Are you sure it's not the sender or the gauge?


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post #3 of 10 (permalink) Old Nov 10th, 05, 03:02 PM Thread Starter
 
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Re: Low oil psi on a 327

Nope it's a sun mechanical gauge, and I've tried 3 different ones, so it is for sure low pressure
Jeff
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post #4 of 10 (permalink) Old Nov 10th, 05, 03:08 PM
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Re: Low oil psi on a 327

If you've verified with other gauges it's likely bearing clearances. If the pickup falls off it'll still have good pressure sitting still as long as the pan is correctly filled. Sounds like it's just a bit tired or was assembled with too large of clearances on the bearings.

Jody


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post #5 of 10 (permalink) Old Nov 10th, 05, 04:01 PM
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Re: Low oil psi on a 327

You can try running straight 50wt and might see a bit of improvement in pressure. I think Kendal is still making the stuff...

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post #6 of 10 (permalink) Old Nov 10th, 05, 08:43 PM
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Re: Low oil psi on a 327

What brand oil filter? There was a string on low oil pressure and fram filters.
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post #7 of 10 (permalink) Old Nov 10th, 05, 09:10 PM Thread Starter
 
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Re: Low oil psi on a 327

IT'S A FRAM! on my way to swap it out right now..
Jeff
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post #8 of 10 (permalink) Old Nov 10th, 05, 09:36 PM
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Re: Low oil psi on a 327

I have a Chevy PU with a 305 that gradually lost oil pressure over the years. At 340,000 miles it would only develop 5 lbs. pressure when cold. When hot it would drop to almost 0. I pulled it out last summer in preparation for my son who will turn 16 in a month. All of the bearings had some wear but the crank and rods were still within specifications. The low oil pressure was caused by a combination of loose bearings and a weak oil pump. There was no serious damage to the motor.

This motor had oil pressure similar to yours at 200,000 miles and I was able to get another 140,000 miles out of it.

Steve

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post #9 of 10 (permalink) Old Nov 11th, 05, 05:30 PM Thread Starter
 
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Re: Low oil psi on a 327

Well I changed out to a Delco filter, and no change in pressure, at this point I'm gonna pull it and put in something with a bit more power..., Ok. Ok a ton more power..
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post #10 of 10 (permalink) Old Nov 12th, 05, 08:20 AM
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Re: Low oil psi on a 327

I have no clue as to what oil pump is in my engine but it sure runs a lot of pressure. At cold start up on a new oil change it run 70 PSI and then drop to 50 PSI normal highway driving. After a run and warming all the way up it will drop to 20 PSI at idle. If I ever take the engine apart and build it again or another I want the same thing again!!


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