360 engine how far should oil pressure drop at idle?

Small Block Mopar Engine

  1. coalman

    coalman Well-Known Member

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    Engine at normal temperature At 750 rpm, what should oil pressure read at the minimum? Thanks
     
  2. fishmens67

    fishmens67 Well-Known Member

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    10 psi minimum, but most have a least 25 to as much as 60 stock.
    My 73 W200 360 stock has 45 hot idle.
     
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    • jay27

      jay27 Well-Known Member

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      Is it and old engine or rebuilt?
      What oil are you running?
      HV oil pump or a stocker?
      There are many variables , what is your hot oil pressure at idle?
       
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      • 67Dart273

        67Dart273 FABO Gold Member FABO Gold Member

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        AND WHAT are you using for a gauge?
         
      • coalman

        coalman Well-Known Member

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        10w30 oil, 20 psi hot idle 650 rpm in drive stopped at traffic light. 60 psi driving, high performance engine was built about 7 seven years ago, in the car when I purchased it five years ago, not many miles on it. Auto Gauge direct reading gauge. Thanks to all
         
      • 318willrun

        318willrun Utube channel 318willrun

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        that is normal, no worries
         
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        • coalman

          coalman Well-Known Member

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          Thanks!
           
        • MOPAROFFICIAL

          MOPAROFFICIAL FABO Gold Member FABO Gold Member

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          650 is low idle, that's half of why its 20.
          750 would make it closer to 30, change to 30 or 20/50 and it would be mid high 30s.
          Reasons for variances.. bearing clearance/applies to failure or or general running clearance, engine oil temp, leakage, OIL WEIGHT.
          30 is what I recommend for nice weather.
          Extreme ends hot/ cold, 20/50
           
        • coalman

          coalman Well-Known Member

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          Thanks, I was thinking about both oils..
           
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          • coalman

            coalman Well-Known Member

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            Tried the 20W50 oil.
             
          • MOPAROFFICIAL

            MOPAROFFICIAL FABO Gold Member FABO Gold Member

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            So what did you see?
            About 10 psi increase in hot idle or ?
             
          • coalman

            coalman Well-Known Member

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            I am going to drive it again, I think the idle psi was higher than that, going down the road it just about equal to the 10W30. Thanks
             
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            • MOPAROFFICIAL

              MOPAROFFICIAL FABO Gold Member FABO Gold Member

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              Makes one feel a lot better. Glad to help.
               
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              • coalman

                coalman Well-Known Member

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                Took it out, 30 to 34 psi at idle. Thanks
                 
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                • RustyRatRod

                  RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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                  20 PSI at 650 hot with 10w30. I'd say you're good to go.
                   
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                  • furrystump

                    furrystump Well-Known Member

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                    I’m about 25 hot idle, about 900-1000 rpm idle. I do a bunch of idling through the pits so I have a higher idle for more splash oiling for the cam, 20w50 Brad Penn grade 1, and shift at 6700 rpm. Have had no issues.
                     
                  • Nat

                    Nat Well-Known Member

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                    I idle at 850-900 and about 40 psi with 10-30 valvoline VR1 synthetic , i would not worry with 20 at 650 as long as it goes upwith the RPMS
                     
                  • DARTLARRY

                    DARTLARRY Well-Known Member

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                    20 psi. at 700pm idle 15W40.
                     
                  • coalman

                    coalman Well-Known Member

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                    I have 20W50 in it now, will see how that goes. Thanks for all the input.
                     
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