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Too much oil pressure for a flathead

Discussion in 'The Hokey Ass Message Board' started by JimSig, Jun 23, 2012.

  1. Is there such a thing as too much oil pressure in a flathead?
    In my 8BA, fully warmed up, at freeway speeds (2000 rpm), I'm getting 75 pounds. Thank goodness the oil is staying inside the engine. The oil pump is a Melling. Should I just thank the Flathead Gods and keep driving?
     
  2. Andy
    Joined: Nov 17, 2002
    Posts: 5,121

    Andy
    Member

    I would pull the oil pump and put in a new spring. My engine did the same thing and it had a real stiff spring. I think it was an attempt by a previous owner to get oil pressure in worn out engine.
     
  3. cuznbrucie
    Joined: May 1, 2005
    Posts: 2,567

    cuznbrucie
    Member

    Is your oil pump a Melling *High Volume* model? If so I would consider installing a *regular* Melling oil pump.........worked for me....same situation...

    CB
     
  4. I think I will call Melling and get their take on it.
     

  5. the stock flathead oiling system is a very good design...it takes horsepower to turn any oil pump...especially a high volume/ high pressure oil pump...put a stock oil pump back in and you should be fine....remember that the flathead is horsepower challenged and by going to a stock pump you may even gain a couple of horsepower !!!
     
  6. 32Gnu
    Joined: May 20, 2010
    Posts: 538

    32Gnu
    Member

    Mine runs 50 at speed...
     
  7. Dog Dish Deluxe
    Joined: Dec 23, 2011
    Posts: 777

    Dog Dish Deluxe
    BANNED
    from MO.

    Keep your oil clean, 75 psi on an old motor has to be jarring a bunch of gunk loose.
     
  8. 40FordGuy
    Joined: Mar 24, 2008
    Posts: 2,907

    40FordGuy
    Member

    That's a bit much..... The reprint version of the Ford "Green Book" reads "30 psi, when driving 30 mph". No mention, of rpm, though. I use a standard melling in my 8BA, and during run in, it ran up to 45, <30 wt oil> until it warmed up, then settled at around 35.

    Happy Flatheadin' !!!!!
    4TTRUK
     
  9. rrthiv
    Joined: May 3, 2011
    Posts: 84

    rrthiv
    Member
    from S.E.Ohio

    I have a EAB engine with a rebuilt stock pump,carries 55 going down the road...
     

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