stock or hv oil pump

Small Block Mopar Engine

  1. pittsburghracer

    pittsburghracer Well-Known Member

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    No I haven’t but we had a lifter bar break on a set of 828-16 lifters in my sons 360 that ran 6.54 trashing the whole engine. About 50 runs on those lifters. This weeks project. Bam lifters fit with zero grinding
     
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    • pittsburghracer

      pittsburghracer Well-Known Member

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      89505EFB-5843-493F-9E8A-488D4671ABEC.jpeg 3A29D982-599C-4D42-B248-572BC09FBC41.jpeg It’s out on my scrap pile now and very hard to see the hours I had in this one to get Comp lifters in it. Block is also tubed.
       
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      • 12swinger

        12swinger Well-Known Member

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        I have that same lifter and about to fire the engine in the next week or so.
        Your making me nervous.
         
      • 12swinger

        12swinger Well-Known Member

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        I have a crap load of hours making that lifter work also.
         
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        • MerlinsMopar

          MerlinsMopar FABO Gold Member FABO Gold Member

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          MV-72HV every build and dont forget the mopar black spring. Always 60-80 psi depending on rpms. They need atleast 10 psi over rpms. 70psi for 6k. If you tach 6000 and only have 50 psi, you are burning up your bearings.
           
        • MOPAROFFICIAL

          MOPAROFFICIAL Well-Known Member

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          • MOPAROFFICIAL

            MOPAROFFICIAL Well-Known Member

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            Bummer.
            I hate comp cams anything.
            Morell lifters for me.
             
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            • Idaho

              Idaho FABO Gold Member FABO Gold Member

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              Since windage is part of the discussion I'll throw this in. I was a tad shocked at the 42 HP assertion. Still wondering if it could be a typo (or a paid ad by Moroso). If real, every stroker should get a deep pan. I don't know if the Magnum truck pan would qualify. I'm guessing not. At least its a rear sump. I would think a windage tray of some sort is also in order.
              4020A0E5-F1DE-4CD4-9156-1431D0C84EBF.jpeg
               
              Last edited: Feb 11, 2020
            • fishmens67

              fishmens67 Well-Known Member

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              seen the effects of standard pump/ high pressure vs HV pumps a few times in different engines with varying clearances.
              I will stick with a standard pump with high pressure spring on my street car. 45 psi at hot idle and 70 psi at 2000 rpm and up.
               
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              • Idaho

                Idaho FABO Gold Member FABO Gold Member

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                I just ground some casting flash. I had two thoughts. Mainly, some looked as if it could break loose and cause trouble. Then, the machinist will see I'm paying attention.
                I did also find a small casting defect right in a corner of the oil pan rail that could predispose to a crack. It was ground smooth.

                Szilagyi talks about a hole to oil the fuel pump eccentric but no mention of chain oiling.
                Of course no fuel pump on the Magnum but does it have the same chain oiling issue?
                 
              • MOPAROFFICIAL

                MOPAROFFICIAL Well-Known Member

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                Stock m72 does that on its own.
                Yee haw
                 
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                • MOPAROFFICIAL

                  MOPAROFFICIAL Well-Known Member

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                  R you thinking what im thinking?

                  God help us.
                   
                • 4spdragtop

                  4spdragtop Well-Known Member

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                  The M72 std vol has a 70-75 psi bypass spring in it.
                   
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                  • mario03srt

                    mario03srt FABO Gold Member FABO Gold Member

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                    The stock Chrysler 360 car oil pan (4 qt?) is a joke for a high performance motor. This is the pan I chose with the Milodon p/u and a 72HV pump. Should I stroke/boost this baby I'm ready for the added demands. But even as, is the stock pan/pump has got to be cavitating or running on the edge during launches, long pulls, hard turns. The P/U and the pump work great together, not sure about in a stock setup, but who is to argue with MOPAR and their testing, I don't think that they would fabricate results.
                     
                  • 12swinger

                    12swinger Well-Known Member

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                    I ran that pan and pickup in my Dart, before going to the super stock oil pan.
                    I moved away from a Hamburger pan, as I figured the oil would be moved out and away from the crank with that pan, and it was a little less deep.
                    What I didn’t foresee was the headers hit the damn pan something fierce had to beat the sucker up, I wasn’t modifying my headers as they were Hooker super comps.
                     
                  • mario03srt

                    mario03srt FABO Gold Member FABO Gold Member

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                    Rusty/All,

                    The limiting dimension on the oil pump inlet and flow performance is the "inner" diameter of the feed tube. Not the Hole in the pump. The outer diameter of the tube is restricted by the pump housing inlet hole. Now there is a limit obviously as to how thin to make the feed tube without it fracturing due to load or harmonics etc to accept a Melling Pump female inlet ID.

                    "In general, the flow rate increases proportional to the square of the inside diameter, hence the flow rate is directly proportional to the area of pipe cross-section. The larger the diameter, the greater flow." I'm sure we agree on this.

                    I found a calculator online and used .375 and .425 tube diameters as examples flowing 10 feet per second. The .375 diameter flowed 3.44 gallons per minute (GPM) and the .425 flowed 4.42 gpm. That's a one gallon increase in a minute by increasing the oil pickup tube "inner" diameter by only .050 thousands. BTW these again are made up parameters I do not know the actual dimensions.

                    FLOW RATE CALCULATOR

                    FYI,
                    Marion
                     
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                    • yellow rose

                      yellow rose Doctor of Thinkology.

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                      I can't get that calculator to work.

                      Can you do the calculations for a 15/16 inner diameter tube? I also think you need to slow the velocity down a bit. 10 feet a second sounds awful fast to me.

                      TIA
                      YR
                       
                    • pittsburghracer

                      pittsburghracer Well-Known Member

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                      8CAE81DE-260D-41B1-8CAC-686EF436FFD7.jpeg E52E7F1B-517B-4B29-B2FA-4DF3E9BC619A.jpeg You could always get fancy like one of our members did on a block and parts I bought from him a few years ago. I forget what he goes by on here but I got him to sign up.
                       
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                      • QuickDart360

                        QuickDart360 Well-Known Member

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                        Had a friend that owns a 1969 pontiac grand prix with a hot rodded 400 pontiac motor. He went thru 2 junk comp cams! And he's a professional mechanic! So he was doing cam break in as recommended. He got fed up and went to a crane grind. All was well!!
                         
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                        • yellow rose

                          yellow rose Doctor of Thinkology.

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                          That system right there will feed enough oil to easily oil the crank to 10k plus.
                           
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                          • Jadaharabi

                            Jadaharabi FABO Gold Member FABO Gold Member

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                            Has anybody ever drilled or cut a hole in the webbing of the mains so that there is air flow between the mains?
                             
                          • pittsburghracer

                            pittsburghracer Well-Known Member

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                            I think some guys are over thinking this. An LA small block will take a lot of horsepower with almost zero work. I don’t think you really want to go drilling holes in what is probably the weakest part of the block. Not trying to be a smart ass but hot air doesn’t cool very well.
                             
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                            • Jadaharabi

                              Jadaharabi FABO Gold Member FABO Gold Member

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                              My understanding is that the holes equalize or balances the pressure produced by the up and down movement of the pistons.
                              Never tried it just something I heard.
                               
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                              • QuickDart360

                                QuickDart360 Well-Known Member

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                                My dad worked for a chrysler/dodge dealer from 1963-1979. He worked on 340 6 packs hemis 340 demons, etc. He never saw any have issues with oiling. All were stock and run hard especially the 340's. He did have some come in that blew a rod but he says it was overreved or just plain abuse!
                                 
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                                • Max1196

                                  Max1196 Well-Known Member

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                                  You mean like how the factory did it on this 65' 318? 5 out of 6 webs have holes.
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