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LOw oil pressure on rebuilt motor.

Tiny
ELBUTCHO
  • MEMBER
  • PONTIAC FIREBIRD
I have a 76 Pontiac 400. It was a boat anchor when I bought it so, I have completely redone my motor twice in the last 12 months. The first time the bearings were under sized so I just got it back running after having the crank polished and new bearing and short block assembled at a local shop. Problem is the oil pressure is fine (50+) PSI at start up but drops to 10 PSI when warm. I have less than 50 miles on the polished crank and correct bearings. I have made sure not to drive the car like this but I am paranoid I am hearing bad rods AGAIN. I used the same (new) oil pump when I pulled the motor this last time as when I built it 12 months ago. I have no windage tray does this matter? Should the Main bearings be fine and should I just worry about the Rod bearings. Or just replace the oil pump?
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Tuesday, September 4th, 2007 AT 11:22 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Did you plastigage the new bearings? Sounds more like you have to go back in -

10-12lbs psi at idle is good enough for me-when I go up to 40mph I should be seeing atleast 40lbs or better.

Than again if it was me I'll just get a crank kit-less headache.
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Wednesday, September 5th, 2007 AT 2:06 AM

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