New motor running 80 oil pressure-is it to high?

Big Block A body Tech

  1. challenger57

    challenger57 cuda57

    Messages:
    207
    Likes Received:
    15
    Joined:
    Sep 21, 2007
    Location:
    york, pa.
    Local Time:
    10:57 AM
    I recently built a 400- 470 stroker and still after about an hour running time it still has 80 oil pressure . After it gets really warmed up it drops to 60 while idleing. It has a milodon oil pump with the adjustable pressure screw. I have it backed out almost all the way. It has a 7qrt. oil pan fully ported 440 source heads 586 lift comp. cam and a 950 dp holley. I am afraid once I start driving this thing and get on it some the oil will push past the critical parts and destroy my motor. What say ye
     
  2. RustyRatRod

    RustyRatRod Lemmie see your b00bs. FABO Gold Member

    Messages:
    67,825
    Likes Received:
    42153
    Joined:
    Jun 7, 2010
    Location:
    Georgia
    Local Time:
    11:57 AM
    Nope, it's fine.
     
  3. 1968FormulaS340

    1968FormulaS340 Well-Known Member

    Messages:
    11,541
    Likes Received:
    481
    Joined:
    Aug 24, 2005
    Location:
    St. Helens Oregon
    Local Time:
    8:57 AM
    It's fine. My 340 has the same oil pressure.
     
  4. Demon416

    Demon416 A-Body

    Messages:
    2,438
    Likes Received:
    26
    Joined:
    Feb 3, 2009
    Location:
    WI.
    Local Time:
    10:57 AM
    x2
     
  5. longarm

    longarm Car sold back to original owners

    Messages:
    2,946
    Likes Received:
    86
    Joined:
    Feb 10, 2006
    Location:
    central ohio
    Local Time:
    11:57 AM
    Probably not a problem but the pumping forces
    are robbing you of some power and make sure
    everythings being oiled properly.
    I'd keep an eye on the oil filter.
     
  6. 412 Stroker

    412 Stroker Well-Known Member

    Messages:
    1,621
    Likes Received:
    29
    Joined:
    Jun 16, 2010
    Location:
    Green Bay, WI
    Local Time:
    10:57 AM
    The gauge might be off as well, you could get a different gauge and check it..if your really worried, what do you have for an Oil Filter?? hope its not a Fram..
     
  7. Bad Sport

    Bad Sport HALF A BUBBLE OFF Staff Member FABO Gold Member

    Messages:
    39,064
    Likes Received:
    21298
    Joined:
    Jun 12, 2010
    Location:
    The Wolverine
    Local Time:
    11:57 AM
    Just for comparison sake, my 40 year old original 85K 318 has 60 PSI on start up.

    Once warm it drops to 40-45.

    I bet after it gets broke in some it will drop a tad.
     
  8. pishta

    pishta I know I'm right....

    Messages:
    19,166
    Likes Received:
    8578
    Joined:
    Oct 13, 2004
    Location:
    Tustin, CA
    Local Time:
    8:57 AM
    Check your pump drive on next maintenance check. make sure you are not rounding your hex with that pressure. Can you check your bypass and make sure the valve is not stuck?
     
  9. william

    william Well-Known Member

    Messages:
    175
    Likes Received:
    11
    Joined:
    Aug 13, 2009
    Location:
    Ottawa
    Local Time:
    10:57 AM
    What grade of oil are you using??
    Maybe you could use a thinner grade oil
     
    • Like Like x 1
    • 440outlawdart

      440outlawdart Well-Known Member

      Messages:
      1,116
      Likes Received:
      253
      Joined:
      Apr 1, 2011
      Location:
      west county,mo.
      Local Time:
      10:57 AM
      that's fine,nothing to worry about
       
    • txstang84

      txstang84 Well-Known Member

      Messages:
      4,496
      Likes Received:
      452
      Joined:
      Oct 10, 2011
      Location:
      Abilene, TX
      Local Time:
      6:57 AM
      X3 on the oil filter concerns...no fram...the end caps pop and go full bypass...yes I have had it happen to me. Go Wix at least.
       
    • krazykuda

      krazykuda Well-Known Member FABO Gold Member How-To Section Editor

      Messages:
      57,450
      Likes Received:
      23088
      Joined:
      Aug 20, 2007
      Location:
      Orland Park, IL
      Local Time:
      10:57 AM
      I've run some higher than that...
       
    • 67Dart273

      67Dart273 FABO Gold Member FABO Gold Member

      Messages:
      46,659
      Likes Received:
      14555
      Joined:
      Oct 14, 2010
      Location:
      Idaho
      Local Time:
      8:57 AM
      Yup. The 340 in the old FJ-40 Landcruiser used to start up cold and bury the 100 PSI SW gauge. It used to routinely run at 80 much above an idle. Never caused a problem. I've always run either Hastings or Wix filters. NEVER run Fram filters!!!!
       
    • roccodart440

      roccodart440 Well-Known Member

      Messages:
      5,723
      Likes Received:
      4713
      Joined:
      Apr 19, 2010
      Local Time:
      11:57 AM
      I went to a 5w and it solved my problems. It's still a bit high but much better.
       
    • 72ScampTramp

      72ScampTramp Scamp Tramp

      Messages:
      4,479
      Likes Received:
      57
      Joined:
      Jan 13, 2009
      Location:
      Fort Dodge Iowa
      Local Time:
      10:57 AM
      Mine runs 80psi new motor seems to be fine to me.
       
    • downsr

      downsr FABO Gold Member FABO Gold Member

      Messages:
      873
      Likes Received:
      466
      Joined:
      Dec 17, 2011
      Location:
      waverly ohio
      Local Time:
      10:57 AM
      Tolerances in the motor are tight,run a stock pump
       
      • Like Like x 1
      • /6 Matt

        /6 Matt 30 Degrees Crooked

        Messages:
        2,531
        Likes Received:
        220
        Joined:
        Jan 19, 2010
        Location:
        Lincolnton, NC
        Local Time:
        11:57 AM
        80 psi is perfect
         
      • moper

        moper FABO Gold Member FABO Gold Member

        Messages:
        15,849
        Likes Received:
        1965
        Joined:
        Dec 27, 2004
        Location:
        eastern CT
        Local Time:
        4:57 PM

        x2.
        I'll add you should have the HP oil pump drive with it. If it was me I'd want it lower.
         
        • Like Like x 1
        • inertia

          inertia Well-Known Member

          Messages:
          3,404
          Likes Received:
          682
          Joined:
          Feb 4, 2011
          Location:
          Victoria B.C. Canada
          Local Time:
          8:57 AM
          Other than the oil filter issues,, the only other consequence of excess oil press,, that I can remember reading,, was it throws a huge amount of oil off the rods, onto the cyl walls, and the oil ring can have a prob scraping the cyl walls ..

          hope it helps
           
          • Like Like x 1
          1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
            By continuing to use this site, you are consenting to our use of cookies.