Oil pump.... reuse or buy new?

Small Block Mopar Engine

  1. dartfreak75

    dartfreak75 FABO Gold Member FABO Gold Member

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    Yea I am starting to see y'alls point in the discount parts. I'm gonna have to go back and redo my lower control arms. :BangHead:
    I was gonna go with engine tech bearings but decided to go with clevete 77 instead ordered them today.
     
  2. Stephen Hotz

    Stephen Hotz FABO Gold Member FABO Gold Member

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    If the pan comes off any of my motors that has any type of run time I dont think twice about changing either oil pump or timing chain. Little peace of mind.
     
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    • krazykuda

      krazykuda FABO Gold Member FABO Gold Member

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      That guy changed the pressure relief spring to gain only 3 psi... confused.gif

      Mellings pumps come with 72 psi springs and the MP high pressure spring is 75 psi.... :realcrazy:
       
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      • RustyRatRod

        RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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        Melling makes a lot of Mopar stuff so it's probably the same spring.
         
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        • krazykuda

          krazykuda FABO Gold Member FABO Gold Member

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          I called Mellings when I did my how to change a pressure relief spring and they told me that they use the 72 psi spring in all of their Mopar oil pumps...

          Mopar Performance uses a 55 psi spring on the standard pumps and you have to use the spring kit to get it to 75 psi...
           
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          • 4spdragtop

            4spdragtop FABO Gold Member FABO Gold Member

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            Same here, spoke to Cale from Melling both Std volume and High volume gets the 70-75 psi bypass spring.
             
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            • dartfreak75

              dartfreak75 FABO Gold Member FABO Gold Member

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              This Is good info! Thanks guys.
               
            • krazykuda

              krazykuda FABO Gold Member FABO Gold Member

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              Yes, they do, but I don't think that they make the standard oil pumps for MP...

              The guy on the MP line could not tell me who makes their oil pumps.... (He didn't know....) :wtf:
               
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              • oldkimmer

                oldkimmer FABO Gold Member FABO Gold Member

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                I consider the oil pump the heart of the engine. Way back in the mid 70s a buddy of mine re used the pump in a 340. Not even 5 hundred miles we were pulling the pan for a new pump. Kim
                 
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                • MopaR&D

                  MopaR&D Nerd Member FABO Gold Member

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                  Shoot I have a Melling pump I got new and it never made more than 60 psi or so, pretty rock-solid but definitely never anywhere near 72-75 psi. Maybe I got an MP one off Mancini? It was 9 years ago I can't remember lol, I do remember it was a standard one though not HV or HP.
                   
                • nm9stheham

                  nm9stheham Well-Known Member

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                  You got the lower pressure relief spring.... 55 psi. The 2 springs look identical but if you put a caliper on them you will find the spring wire in the higher pressure spring is a few thousandths thicker.
                   
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                  • dartfreak75

                    dartfreak75 FABO Gold Member FABO Gold Member

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                    Is higher oil pressure always a good thing? I mean is 60 any better than 50?
                     
                  • oldkimmer

                    oldkimmer FABO Gold Member FABO Gold Member

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                    Not necessarily, if u have good idle pressure say 20 lbs at 600 rpm or 30 lbs at 1000rpm ur good to go. Kim
                     
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                    • dartfreak75

                      dartfreak75 FABO Gold Member FABO Gold Member

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                      Yea that is what I was thinking also I didn't what to get wrapped up in trying to get 60 or 70 psi if 50 is good enough
                       
                    • oldkimmer

                      oldkimmer FABO Gold Member FABO Gold Member

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                      I had 1 motor that had 50 cold and 40 at warm idle. Kim
                       
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                      • SpeedThrills

                        SpeedThrills Well-Known Member

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                        High oil pressure robs horsepower.
                         
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                        • dartfreak75

                          dartfreak75 FABO Gold Member FABO Gold Member

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                          How high we talking?
                           
                        • nm9stheham

                          nm9stheham Well-Known Member

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                          A fraction of an HP....
                           
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                          • SpeedThrills

                            SpeedThrills Well-Known Member

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                            I can't say for certain; you might get a more definitive answer from someone on Classracer.com. Those guys look hard for every last hp.
                             
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                            • Wyrmrider

                              Wyrmrider Well-Known Member

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                              AS with new cylinder heads new oil pumps have to be pulled apart and inspected
                              best to round the corners and to check and see if the passages line up
                              I've found all kinds of grinder crap in new pumps
                              and there is a lot of junk out there
                              remember that the size and flow of the intake side is very important, more important than the pressure side
                              oiling of Mopars from one to the other is critical
                               
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                              • AJ/FormS

                                AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s FABO Gold Member

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                                Don't hate me but what's an oil-pressure gauge,lol. I have no idea what my engine is running on, I never look at it. That factory gauge only says one thing to me, put it in gear and let the clutch out.
                                If the engine develops a problem at 6000 rpm that would be 100 Rs per second, and she's toast anyway. My hot idle rpm depends on where I have my Dial-back timing set, so unless I was to watch that gauge religiously, the pressure could be this or that.
                                I just jump in and drive; What ever will be will be.
                                 
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                                • RustyRatRod

                                  RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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                                  Splittin hairs.
                                   
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                                  • dartfreak75

                                    dartfreak75 FABO Gold Member FABO Gold Member

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                                    I agree my everyday driver has 0, 40, 110. As long as it stays above 40 I never give it a second thought. Tbo I didn't even know what the recommend pressure was until the other day.
                                     
                                  • j par

                                    j par Well-hung Member

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                                    Well you're in deep now! LOL might as well buy new everything that matters and an oil pump matters..
                                     
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                                    • dartfreak75

                                      dartfreak75 FABO Gold Member FABO Gold Member

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                                      Yea I know lol I'm in so far I'm at the point of getting nervous about it. If something goes wrong it's to late to turn around now.
                                       
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