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-10 AN or -8 AN???

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  • -10 AN or -8 AN???

    I'd like to ask your opinion on line/ hose size for expanding the oil system of an engine, utilizing only the OEM oil pump.

    Without having a great surplus of time and "test" engines to experiment with pressures, this is what we know:

    •OEM oil setup- regular 17-20 psi idle
    • about 7 ft -10 AN lines, -10 AN fittings, sandwich thermo, 19-row cooler (mounted upside down...found to possibly be trapping air) - 10-12 psi idle, sometimes as low as 8psi)

    With 10+ ft of -10AN hose, oil filter relocation and oil cooler would the pressure drop be too much? would -8AN be better? worse? and has anyone used -8AN size hose for their expanded oil system setups? (seems like the standard is -10AN).
    "A pessimist thinks the glass is half-empty, an optimist thinks the glass is half-full, an engineer says that glass is twice as big as it needs to be"
    instagram:@cleantune ; Twitter: Cleantune@Cleantune2

  • #2
    -8 an will have more pressure drop, all things equal.
    '18 Chevrolet Volt - Electric fun hatch for DD duty!


    DefSport Koni Sleeve and Spring Perch Buy!!!
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    • #3
      Thanks for the response.

      So is the pressure drop because of something weird/normal the pump does?

      My thoughts were that by decrease diameter, decrease flow, but increase pressure.

      🙆
      "A pessimist thinks the glass is half-empty, an optimist thinks the glass is half-full, an engineer says that glass is twice as big as it needs to be"
      instagram:@cleantune ; Twitter: Cleantune@Cleantune2

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      • #4
        Originally posted by cleantune View Post
        Thanks for the response.

        So is the pressure drop because of something weird/normal the pump does?

        My thoughts were that by decrease diameter, decrease flow, but increase pressure.

        🙆
        It's from the internal friction in the fluid caused by pumping it through additional lines at high speed. The -8 AN lines are smaller in diameter than the -10 AN lines, so the speed is higher on the -8's, which gives more pressure drop due to this friction. It'll increase at roughly the velocity increase squared.

        It's like blowing through a short straw vs. a long straw. The long straw offers more resistance due to the friction created by the longer straw.

        The pump will do the same thing it always does, you'll just have a little less pressure at the engine after the cooler. -10 AN lines have been proven to be fine.
        '18 Chevrolet Volt - Electric fun hatch for DD duty!


        DefSport Koni Sleeve and Spring Perch Buy!!!
        http://www.nissanroadracing.com/showthread.php?t=5902

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        • #5
          Awesome, great info, thank you!
          "A pessimist thinks the glass is half-empty, an optimist thinks the glass is half-full, an engineer says that glass is twice as big as it needs to be"
          instagram:@cleantune ; Twitter: Cleantune@Cleantune2

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          • #6
            Have one more quick question that I was hoping maybe someone could please help with:

            How do you guys install/ get all the air out of long oil lines without starving the motor?
            (long= a little under 10ft of -10AN)

            I plan to fill up the oil cooler, the oil filter and any lines possible (depending on angles). I was also planning on bleeding out the precharge on the accusump, pushing the piston down, filling it with oil and then with the valve open, reset the precharge to push oil into the motor.

            Is there an easier way to help beed out air in the oil lines without causing harm to the motor? It just seems like with this much hose, it could create an oil pressure problem with trapped air.

            .
            "A pessimist thinks the glass is half-empty, an optimist thinks the glass is half-full, an engineer says that glass is twice as big as it needs to be"
            instagram:@cleantune ; Twitter: Cleantune@Cleantune2

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            • #7
              All thermostats I've seen slowly flow on the oil cooler circuit while the engine is running. It won't hurt anything.
              '18 Chevrolet Volt - Electric fun hatch for DD duty!


              DefSport Koni Sleeve and Spring Perch Buy!!!
              http://www.nissanroadracing.com/showthread.php?t=5902

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              • #8
                .

                even without a thermostat installed would it be ok?

                And just to clarify: So it would be okay to just fill everything possible with oil and run the motor to bleed out any leftover air in the system?
                "A pessimist thinks the glass is half-empty, an optimist thinks the glass is half-full, an engineer says that glass is twice as big as it needs to be"
                instagram:@cleantune ; Twitter: Cleantune@Cleantune2

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                • #9
                  Sure. Most of the oil valleys drain anyway on shut off. Do some prelim filling and itlll be fine.
                  '18 Chevrolet Volt - Electric fun hatch for DD duty!


                  DefSport Koni Sleeve and Spring Perch Buy!!!
                  http://www.nissanroadracing.com/showthread.php?t=5902

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                  • #10
                    Awesome, thanks!
                    "A pessimist thinks the glass is half-empty, an optimist thinks the glass is half-full, an engineer says that glass is twice as big as it needs to be"
                    instagram:@cleantune ; Twitter: Cleantune@Cleantune2

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