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Thread: Scavenge pump oil aeration

  1. #1
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    Scavenge pump oil aeration

    Hi all,

    I am trying to run a scavenge pump on my bottom mount build.

    I am concerned about the aeration of the oil as the pump mixes air\oil from the turbo drain. I tested the pump on a bench and it creates a lot of bubbles in the oil.

    Has anyone had issues with draining the line into the dipstick tube and bubbles making it to the oil pick up? I am hoping they will stay on top and eventually dissipate but I am also afraid of oil pump cavitation and starvation.

    Thanks!

  2. #2
    Join Date
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    Concord, NH
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    I drained to the dipstick tube and later to the top of the pan further back and closer to the scavenge pump. Also returned to side of pan for a while below the oil level. No issues with any return. I think the top of the pan was best. Now draining gravity to side of pan near turbo.

  3. #3
    Join Date
    Jul 2005
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    PEI, Canada
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    2001 330i
    Quote Originally Posted by kalinrs View Post
    Hi all,

    I am trying to run a scavenge pump on my bottom mount build.

    I am concerned about the aeration of the oil as the pump mixes air\oil from the turbo drain. I tested the pump on a bench and it creates a lot of bubbles in the oil.

    Has anyone had issues with draining the line into the dipstick tube and bubbles making it to the oil pick up? I am hoping they will stay on top and eventually dissipate but I am also afraid of oil pump cavitation and starvation.

    Thanks!
    From a volume perspective, the turbo gets about 1% of the total oil flow.

    I would be far more worried about the aeration that occurs from the valve spring getting oil sprayed off them from the cam cap lubrication......or the pistons getting sprayed with oil jets while they move over 4000 feet / second!

    Where does you're concern come from?

    If you stuck a glass window on the side of the oil pan, I think you'd be surprised how much it looks like chocolate mouse.....oil IS a foam under higher RPM engine speeds unless you run a dry sump.

  4. #4
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    Great, thank you both for the info. I figured there would be some air in the oil during normal operation but I didn't know it will be as much.

    The concern came from bench testing the pump and the amount of bubbles I saw in the oil after cycling a quart for a minute or so.

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