Oil pressure problem...
Oil pressure problem... Ok so we put a friends motor together a few days ago and I'm stumped about why it's losing oil pressure. At cold idle pressure is at 60, and about 30 hot after driving it for awhile. Seems normal right? Well after we did a hard pull through the gears it fell to like 10psi at idle and just shy of 40 driving under rpm... It wouldn't come back up till the car cooled down. I changed the pick up o-ring and still the exact same symptoms... Think it could be the tsp ported pump? Or what? I'm stumped..
This sounds about normal for an engine with some loose clearances. The pressures you have are not dangerous...they are good enough. What weight oil are you using? You can always use a heavier viscosity and that should help. But this sure sounds like loose bearings, thrust, etc.
Ok so we put a friends motor together a few days ago and I'm stumped about why it's losing oil pressure. At cold idle pressure is at 60, and about 30 hot after driving it for awhile. Seems normal right? Well after we did a hard pull through the gears it fell to like 10psi at idle and just shy of 40 driving under rpm... It wouldn't come back up till the car cooled down. I changed the pick up o-ring and still the exact same symptoms... Think it could be the tsp ported pump? Or what? I'm stumped..
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I thought the O-ring being torn or unseated causes no or very little pressure
and noisy valvetrain. I'm betting the OP just has loose main clearances. They
need to be tighter than GEN 1 sbc because of the expansion rate of the
alloy block. IIRC 0.0016-0.002 is the target. Having close to 3 thousandths
will act exactly as the condition stated.
and noisy valvetrain. I'm betting the OP just has loose main clearances. They
need to be tighter than GEN 1 sbc because of the expansion rate of the
alloy block. IIRC 0.0016-0.002 is the target. Having close to 3 thousandths
will act exactly as the condition stated.
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i had a section of my o-ring missing (about 20%) and my oil pressure dropped to about 10lbs when hot from about 40lbs. i replaced the pump and 0-ring and its at 60lbs+ cold and 40lbs hot now.
Unless u have a bigger oil pan capacity, that hv pump is draining the oil pan before the oil from the topend can make its way back down to the pump...thats why I wouldnt run a hv or ported pump unless I had a 6.5 qt pan or higher...just my experience
