oil pressure 68 383

Engine, Trans & Driveline

  1. __Larsson____

    __Larsson____ Member

    Messages:
    24
    Likes Received:
    10
    Joined:
    Jan 7, 2015
    Location:
    JONKOPING
    Local Time:
    9:04 PM
    Hi guys! What is a good oilpressure in a 68 383?
     
  2. Kern Dog

    Kern Dog FBBO Gold Member FBBO Gold Member

    Messages:
    12,843
    Likes Received:
    26338
    Joined:
    Apr 13, 2012
    Location:
    Granite Bay CA
    Local Time:
    7:04 PM
    That is a really open question. A rebuilt one with a high volume pump will show a much higher reading than a 300,000 mile engine with 5w20 oil. Maybe if you described the condition of the engine it would help to determine what is in the normal range. All big blocks will have similar numbers if they are in equal condition.
    Usually, an engine in good condition will have a cold start idle reading over 70 psi with a 30 weight oil. My 440/493 runs 80 when cold in Park or neutral. In gear at idle of around 750-850 rpms when warm and in 100 degree heat, it may drop to 25 momentarily but once the rpms come up above 1000, it responds and leaps over 50 again.
    Chevys typically run lower pressures. I drove Chevys for years and when I built my first 440, I was shocked at how high the pressures were for Mopar engines.
     
    • Agree Agree x 1
    • miller

      miller Well-Known Member

      Messages:
      4,016
      Likes Received:
      1954
      Joined:
      Jan 5, 2014
      Location:
      Tom Bean,Texas
      Local Time:
      9:04 PM
      45-50 lbs for a stock BB Mopar engine, is normal.
       
      • Agree Agree x 4
      • 91r/t

        91r/t FBBO Gold Member FBBO Gold Member

        Messages:
        1,506
        Likes Received:
        1650
        Joined:
        May 7, 2011
        Location:
        Buffalo, NY
        Local Time:
        9:04 PM
        Bearing clearances will determine where your pressure is at as well. A performance engine with a little more main and rod bearing clearance will have a lower pressure than a stock engine with tighter clearances as well. Alot goes into factoring oil pressure. I'd say any stock style engine with 40-50 lbs of oil pressure at operating temp is pretty healthy with stock pump and bearings. Obviously it will drop a bit at idle no worries there either.
         
        • Agree Agree x 3
        • moparedtn

          moparedtn FBBO Gold Member FBBO Gold Member

          Messages:
          5,105
          Likes Received:
          6851
          Joined:
          May 14, 2011
          Location:
          On the Ridge, TN
          Local Time:
          10:04 PM
          Yep, factory service manual says 45-60 at 1000 RPM.
          My own 440 (of unknown age/build, but supposedly pretty fresh) starts cold at 80psi, then drops off to a sort of scary hot oil pressure at idle of 25 (750 RPM), but jumps the moment you touch the throttle.

          What oil you run, the condition of it, all sorts of factors can affect this - including what filter you run. Of course, how accurate your oil pressure gauge is matters as well.
          I actually run a thinner weight oil than my instincts tell me to (10W30) because the pressure gets pretty scary high when cold.
           
          • Thanks! Thanks! x 1
          • Agree Agree x 1
          • Ranger16

            Ranger16 Well-Known Member

            Messages:
            3,139
            Likes Received:
            3671
            Joined:
            Jun 27, 2016
            Location:
            Woodstock Ill.
            Local Time:
            9:04 PM
            Why do you ask? What are your concerns? What oil pressure are you seeing?
             
          • dart4forte

            dart4forte Well-Known Member

            Messages:
            1,033
            Likes Received:
            696
            Joined:
            Apr 29, 2009
            Location:
            Mesa, AZ
            Local Time:
            9:04 PM
            I run 75 Pds cold at idle. After running around it runs 25 at idle but jumps right back up at 60pds
             
            • Like Like x 1
            • Thanks! Thanks! x 1
            • 66383

              66383 FBBO Gold Member FBBO Gold Member

              Messages:
              1,312
              Likes Received:
              960
              Joined:
              Jan 19, 2018
              Location:
              calvert city, ky
              Local Time:
              9:04 PM
              72# down the road cruising @ 2500 RPM.
               
            • Kern Dog

              Kern Dog FBBO Gold Member FBBO Gold Member

              Messages:
              12,843
              Likes Received:
              26338
              Joined:
              Apr 13, 2012
              Location:
              Granite Bay CA
              Local Time:
              7:04 PM
              Sorry, but this is not accurate enough of a response.
              45-50 lbs when? At idle? At 6000 rpms? with an old engine or a fresh rebuild? Thick oil or thin?
              Too many variables to pin down without the OP responding with more info.
               
            • miller

              miller Well-Known Member

              Messages:
              4,016
              Likes Received:
              1954
              Joined:
              Jan 5, 2014
              Location:
              Tom Bean,Texas
              Local Time:
              9:04 PM
              What part of 'stock' don't you understand?
              My 440, once it's fired up, has 50 lbs. Stays there, until it's warmed up. 3000 rpm stays there. Once warm, at idle, it's 25-30 lbs. Engine is mostly stock, though with a 1/2" oil pick-up, with a stock oil pump.
               
            • Cranky

              Cranky Moderator Staff Member FBBO Gold Member

              Messages:
              18,367
              Likes Received:
              13703
              Joined:
              Dec 4, 2009
              Location:
              Pasa-getdown-dena Texas
              Local Time:
              9:04 PM
              At 6000 rpm you should have at least 3000 psi :D
               
              • Like Like x 2
              • khryslerkid

                khryslerkid FBBO Gold Member FBBO Gold Member

                Messages:
                18,345
                Likes Received:
                25613
                Joined:
                Mar 10, 2010
                Location:
                Hanover, Pennslyvania
                Local Time:
                10:04 PM
                What if you only have an idiot light and no guage?
                 
                • Thanks! Thanks! x 1
                • Kern Dog

                  Kern Dog FBBO Gold Member FBBO Gold Member

                  Messages:
                  12,843
                  Likes Received:
                  26338
                  Joined:
                  Apr 13, 2012
                  Location:
                  Granite Bay CA
                  Local Time:
                  7:04 PM
                  Relax. Just writing a number like 45-50 lbs is pointless until you give it context. You didn't mention at what rpm, what oil or what temperature. Your number is a good one but it gives no reference to anything. 60 wt oil with a worn out engine can generate that number at 4000 rpms.
                  I brought his daughter home at 8:00 PM....why is the Father so pissed off? He wanted her home before 9:00.
                  He is pissed off because I brought her home at 8:00 PM three days late.
                  See ? Now the context makes sense, right?
                   
                  • Thanks! Thanks! x 1
                  • BSB67

                    BSB67 FBBO Gold Member FBBO Gold Member

                    Messages:
                    750
                    Likes Received:
                    592
                    Joined:
                    Jan 18, 2018
                    Location:
                    PA
                    Local Time:
                    10:04 PM
                    One might argue that it's the OP's lack of context that is the issue. In light of the question, Miller's responds is as good as any.

                    My answer to to question would be 10 to 90 psi.
                     
                  • moparedtn

                    moparedtn FBBO Gold Member FBBO Gold Member

                    Messages:
                    5,105
                    Likes Received:
                    6851
                    Joined:
                    May 14, 2011
                    Location:
                    On the Ridge, TN
                    Local Time:
                    10:04 PM
                    They call 'em that for a reason, my friend. :)
                     
                    • Like Like x 2
                    • Thanks! Thanks! x 1
                    • moparedtn

                      moparedtn FBBO Gold Member FBBO Gold Member

                      Messages:
                      5,105
                      Likes Received:
                      6851
                      Joined:
                      May 14, 2011
                      Location:
                      On the Ridge, TN
                      Local Time:
                      10:04 PM
                      His original answer? Not so much, because oil pressure in an engine is stated at a given RPM - so half his response was missing.
                       
                      • Thanks! Thanks! x 1
                      • BSB67

                        BSB67 FBBO Gold Member FBBO Gold Member

                        Messages:
                        750
                        Likes Received:
                        592
                        Joined:
                        Jan 18, 2018
                        Location:
                        PA
                        Local Time:
                        10:04 PM
                        But what rpm? Are we suppose to guess what rpm the OP wants, or just give it to him in 5 rpm increments? And what kind of 383? For what purpose? Between the pump type, bearing clearance, and oil viscosity any answer could be right or wrong.

                        An OP should not expect any better of an answer than he/she is willing to put into the question.
                         
                        • Like Like x 1
                        • Thanks! Thanks! x 1
                        • moparedtn

                          moparedtn FBBO Gold Member FBBO Gold Member

                          Messages:
                          5,105
                          Likes Received:
                          6851
                          Joined:
                          May 14, 2011
                          Location:
                          On the Ridge, TN
                          Local Time:
                          10:04 PM
                          When in doubt, spout off factory numbers like I did - and hope the OP actually returns to finish his question. :)
                           
                        • khryslerkid

                          khryslerkid FBBO Gold Member FBBO Gold Member

                          Messages:
                          18,345
                          Likes Received:
                          25613
                          Joined:
                          Mar 10, 2010
                          Location:
                          Hanover, Pennslyvania
                          Local Time:
                          10:04 PM
                          The light that comes on ten minutes after the tow truck gets there! :)
                           
                          • Like Like x 1
                          • moparedtn

                            moparedtn FBBO Gold Member FBBO Gold Member

                            Messages:
                            5,105
                            Likes Received:
                            6851
                            Joined:
                            May 14, 2011
                            Location:
                            On the Ridge, TN
                            Local Time:
                            10:04 PM
                            :lol:
                             
                          1. This site uses cookies to help personalise 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.