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I'm replacing the oil line between the oil pump input and the oil cooler in my 1991 Kitfox 912. The oil pump input has a 3/8" barb and the oil cooler has a 1/2 " barb. The line I took off was 1/2" hose. The previous owner used a hose clamp to compress the hose to fit. I'm not comfortable redoing that technique. I was thinking of using a 3/8" to 1/2" hose barb adapter with a short piece of 3/8" hose since this engine has 1,100+ hours running just fine with this setup. Any comments yea or nay?

Pete Christensen
  • Re: Oil pump input nipple

    by » 8 years ago


    Hi Pete,

    The oil will be slowed at the smallest orifice (the 3/8" fitting). Replace it with a 1/2" and then use your 1/2" hose.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: Oil pump input nipple

    by » 8 years ago


    Just located one. Thanks roger.

    Pete

  • Re: Oil pump input nipple

    by » 8 years ago


    Replacing the tiny bit is the thing to do.
    But I cannot resist to ad that Bernoulli and Venturi suggest that the oil actually speeds up at the bottleneck.
    I found a very similar installation on a fuel line where brute force was supposed to squeeze the connections tight. However, it did not work, surprise.
    If I may ask, did you have any obvious fluctuation on your oil pressure or was it all normal?

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