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Author Topic:   oil pressure
dode
Member
posted June 07, 2002 10:16 AM
ok...we changed the oil last night and fired it up. Now we are getting lower oil pressure at idle than we did before (10 psi now). It runs up to about 60 at 4000 rpm, so I guess it is fine. This is a 350 in a factory stock. Is this anything to be worried about? I am just wondering why it changed. We are using the same oil (Mobil 20-50) and filter (AC Delco). Thanks.

John

ryan
Member
posted June 07, 2002 12:55 PM
Change the filter again maybe you got a defective one from the factory??


dode
Member
posted June 07, 2002 01:09 PM
Is there any way I could know it is bad, or should we just change it? How much oil would we lose just changing the filter?

John

dirtbuster
Member
posted June 07, 2002 02:03 PM
without cutting the filter open there would be no way of knowing. For the 3$ it costs for a filter it would be the place to start.

You would probably lose close to a quart if you are using the standard small block chevy filter.

Also check your guage. It might be bad especially if it is electric you may have a baad connection. Get a good mechanical oil pressure guage that you know works and hook it up to see what reading you get.

dode
Member
posted June 07, 2002 02:09 PM
it is a mechanical gauge...we don't have another one, but I am guessing that it is right. I have no reason do doubt it. I will grab a new filter tonight on the way to the races I guess. I really don't want to, but I guess we can change it there. Thanks!!

John

racer17j
Member
posted June 08, 2002 03:34 AM
do you have the small plastic tube on the gauge or the heavy rubber. if it's the small one check and make sure it's not kinked mine did it to me last week


BayouGent
Member
posted June 08, 2002 03:47 AM
I'd replace the filter too just to be on the safe side. Although I like to see more oil pressure than that at idle, I've always gone by the rule 10 lbs. for every 1000 RPM's. If you end up with only 10 at say 1000 and it goes up to 60 at 4000, then I say go with it. High volume pumps seem to be notorious for having a large pressure range. Oh, getting back to the oil filter, you can fill the new oil filter with oil when you install it and then crank the engine for a few minutes. Let it sit for a few minutes after you cut then engine off then add oil as needed. It should be close to full though. This also helps eliminate that few seconds it takes for the oil pump to fill the oil filter with oil which makes it take a little longer for the oil pressure to come up. Just my few cents.


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