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Excesss oil pressure

Discussion in 'The Hokey Ass Message Board' started by maniac, Jun 13, 2010.

  1. maniac
    Joined: Jul 11, 2005
    Posts: 539

    maniac
    Member

    Had to replace the oil pan on my 38, so while I was in there I changed the oil pump to a GM Z-28 hi-volume pump that I had on the shelf.

    I have about 70 PSI on start up and then it goes to 50 PSI when hot, today when I got on it, lots of blue smoke, engine has maybe 40,000 since rebuild, and never been overheated.

    Is it possible for the oil pressure to be so high that it pushes past the rings, I have never seen it before, of course that doesn't mean it can't happen.

    Had 30 PSI before I changed the pump, probably should have left it alone.

    What do you all think?
     
  2. dave lewis
    Joined: Dec 12, 2006
    Posts: 1,362

    dave lewis
    Member

    Stock oil pump specs are 60 psi max.. Z 2/8 pump is 20% higher pressure and volume (60 + 12 = 72 ) So you are on the money .
    I would suspect a leak created when you changed the pan as the source of the smoke.
    Dave
     
  3. maniac
    Joined: Jul 11, 2005
    Posts: 539

    maniac
    Member

    Thanks Dave, I was just reading the PCV thread and am thinking I am sucking oil thru the PCV, since I changed the valve covers a little bit after I did the oil pump.

    Who ever said its a "finished" car.........
     

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