HV oil pump vs Stock oil pan

Small Block Mopar Engine

  1. 512Stroker

    512Stroker We are all here because we are not all there.

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    I have noticed in xtreme heat that the oil pressure on my LA 340 drops to 15-18 psi at idle while in gear. 10W-40 Dino oil, Wix filter
    I am wanting to up the idle oil pressure via a high volume Melling oil pump M-72-HV.
    Has anyone run a HV Melling pump with the stock 5 quart oil pan?
    Ya hear the stories of "sucking the pan dry" with high volume oil pumps.
    Keep in mind this engine is a street application with a rev limiter setting of 6500 rpm.
     
  2. 64 Sportfury

    64 Sportfury FABO Gold Member FABO Gold Member

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    318/390 HV oil pump with stock oil pan. Pick up on the pan floor. About 5000 mi. No problems. Pressure in FL heat 35 psi at idle. 20200712_183541.jpg 20200918_143853.jpg
     
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    • diymirage

      diymirage HP@idle > hondaHP@redline

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      what RPM do you idle at?

      anything under 1000 i wouldnt bat an eye sitting at 15 PSI


      as far as sucking the pan dry, what you are worried about is not how fast the pump gets rid of it, but how slow it drains back
      so look up the "oil mods" sticky and make sure you're block can return the oil back to the pan
       
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      • 64 Sportfury

        64 Sportfury FABO Gold Member FABO Gold Member

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        BTW that's with 10w30 and I drilled extra holes in the oil filter drain back.
         
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        • Plymouth 65

          Plymouth 65 Floorable Deplorable

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          That combination won't be a problem at all. I run the same in my 273 Commando without issue. 65'
           
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          • 512Stroker

            512Stroker We are all here because we are not all there.

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            850 rpm hot idle with the A/C on.
             
          • 512Stroker

            512Stroker We are all here because we are not all there.

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            Are you referring to the oil drain from the head? Got any pic's?
             
          • diymirage

            diymirage HP@idle > hondaHP@redline

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            i wouldnt worry about that one bit
            (rule of thumb, you want 10 PSI per 1000 RMPs, you are seeing 17 PSI per 1000 PRM)
             
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            • 64 Sportfury

              64 Sportfury FABO Gold Member FABO Gold Member

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              No the oil filter adapter.
               
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              • RustyRatRod

                RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                If you want to add more pressure, the HV pump is not the way to do it. Get the MP high pressure spring and put it in the pump you have. But 15 PSI at 800 RPM hot is plenty. If you don't think it is, unscrew the filter while it's running.
                 
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                • 64 Sportfury

                  64 Sportfury FABO Gold Member FABO Gold Member

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                  I installed a windage tray and smoothed the oil pump inlet/outlet?? 20191225_144414.jpg 20191225_133950.jpg
                   
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                  • fishmens67

                    fishmens67 FABO Gold Member FABO Gold Member

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                    This !
                     
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                    • 512Stroker

                      512Stroker We are all here because we are not all there.

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                      Rusty I was advised by a Tech at Melling that the high pressure spring wont gain any more pressure at idle as the relief valve controlled by the spring is closed at idle. He recommended I install the HV oil pump to gain psi at idle.
                      It's the roller lifters using some extra oil causing a small pressure drop.
                      With flat tappet lifters this same pump produced 25 psi @ hot idle
                       
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                      • tonysrt

                        tonysrt FABO Gold Member FABO Gold Member

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                        You do that and you'll have the EPA knocking on your door. They'll probably try to sell you an electric car while they're there.
                         
                      • RustyRatRod

                        RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                        Here's what the HP spring in a stock pump did for my slant 6 at idle.
                         
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                        • 512Stroker

                          512Stroker We are all here because we are not all there.

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                        • RustyRatRod

                          RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                          All that said, I wouldn't touch it. I don't see where you're having an issue. Honestly, if you think 15PSI is low, take my advice and unscrew the filter a thread or two at idle. You'll change your mind real quick.
                           
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                          • 512Stroker

                            512Stroker We are all here because we are not all there.

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                            I'll pass on your filter technique.
                            Those springs are dam hard to find
                             
                          • RustyRatRod

                            RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                          • 512Stroker

                            512Stroker We are all here because we are not all there.

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                          • RustyRatRod

                            RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                            Well yeah.
                             
                          • missing linc

                            missing linc Loose nut behind the wheel

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                            Unlikely you would run dry at that RPM, unless you're running autocross or road racing. I run a Melling high volume pump in my 360, cold start oil pressure pushes 100, hot idling 45 with 10W30 conventional oil.
                             
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                            • Bewy

                              Bewy Well-Known Member

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                              The oil is doing what it is supposed to do with extreme heat: drop oil pressure because it thins out with the heat.
                              I would fix it with oil, not stronger springs or pumps.
                              Try 10w/50 oil. You will get the same cold weather flow with the '10', but higher viscosity at higher temps with the 50.
                              I live in a moderate climate [ similar to LA ] & I use 10w/60, have done for years. Not worried about the 3.768 hp I will lose....
                               
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                              • 66fs

                                66fs FABO Gold Member FABO Gold Member

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                                I ran one with the high pressure spring and windage tray in the 64 Barracuda daily driver for years. 273, spun to 3,000 rpm minimum, 6,500 rpm power shifts, sometimes past 7,000 rpm by accident or incompetence, 100,000 miles on it minimum. No problem. I always run 20w-50 or straight 30 Valvoline VR-1 since the 70's.
                                 
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                                • mario03srt

                                  mario03srt Well-Known Member

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                                  The stock pan is barely capable. If you are not going to drive it like a "normal" person. I would start there myself. The small capacity and in particular the sloshing around under acceleration or aggressive turning makes the issue worse. Tiny Bubbles are not your friend. I have the HV pump on a fresh engine and hot oil pressure at idle is around 40 psi. Also a Milodon Pan w/ baffles etc. Small investment to keep an engine alive under agressive driving.

                                  Marion
                                   
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