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Oil system pressures of KA motors

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  • Oil system pressures of KA motors

    .

    So there has been some oil pressure drops with just a thermostat oil plate adapter, -10AN lines/fittings and an Earl's 19 row cooler. The pressure drop is mainly noticed at idle and was noted as low as 9psi. When the engine is under load the oil pressure raises and operates "normally". The pressure gauge is connected to a fitting (cylinder with pressure gauge at the end of it) that goes to the OEM oil pressure location. The oil feed line comes out of the side of this fitting.

    We're looking to expand this setup to incorporate an accusump unit as well- which according to the companies recommendations, should utilize -10AN line to/from the accusump unit. Also we'd like to switch out the sandwich plate for an adapter to use a 4-port thermostat and relocate the oil filter and oil pressure gauge for a more accurate reading.

    Is -10AN line too big for the KA motor's oil pump? Should -8AN line be used instead where ever possible?


    .
    "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: [email protected]

  • #2
    What weight oil? what engine/oil temps did this occur?

    If the oil is hot and you're using 5w30, then ~10psi isn't a big deal really, as long as your pressure at higher engine speeds is normal.

    Maybe go to a 10w30 or a straight 30wt to give it a bit more pressure at idle...
    Originally posted by SoSideways
    I don't care what color they are as long as they are LONG AND HARD.
    '04 G35 Sedan 6MT- The DD
    '96 240SX- The Track Toy

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    • #3
      .
      At the time the engine was filled with 10W30, but the engine/oil temp wasn't noted. The pressure drop was noticed after the engine was up to normal operating temperature though, and pressure drop occurred after the thermostat was open (this particular oil thermo opens @ ~160-180 deg F).

      It was weird though because without the sandwich plate and oil cooler installed the oil pressures were higher- nothing else was changed; new/same oil, even used the same brand and model oil filter. Just to confirm this, the cooler and sandwich plate was removed and the oil pressures returned (increased) to "normal" pressures.

      *oh, one more important detail... the oil cooler was installed upside down, with the ports on the bottom:


      .
      .
      "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: Clean[email protected]

      Comment


      • #4
        there are some additional frictional losses when you have that much line to deal with. not entirely out of the ordinary. I doubt decreasing the size of the lines will help, since that only increases pumping losses..
        Originally posted by SoSideways
        I don't care what color they are as long as they are LONG AND HARD.
        '04 G35 Sedan 6MT- The DD
        '96 240SX- The Track Toy

        Comment


        • #5
          .
          huh, thanks for mentioning this; I haven't even considered friction and line length as possibilities. The total line length is about 4 ft 7in (one 22"line, one 33"line), so it does have some significant distance to travel.

          So in general, fluid pumps loose efficiency over further distances because of what you had mentioned. "Head loss is unavoidable and is present because of the friction between the fluid and the walls of the pipe and is also present between adjacent fluid particles as they flow along the pipe."-vccs.edu

          ^ this statement supporting quote was in the beginning of an online lecture, which seems to be full of all kinds of fun math and stuff haha.

          If anyone is bored or interested, here's the link:
          http://water.me.vccs.edu/courses/civ240/lesson6.htm

          .
          "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: [email protected]

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