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Compensation Tube

in 912 / 914 Technical Questions 13 years ago
I'm installing a manifold pressure gauge on my 912UL. I have the old style compensation tube without a vacuum hookup. The new style compensation tube is big bucks. What would be the best way to "T" a vacuum line on the old compensation tube??? Any ideas????

  • Re: Compensation Tube

    by » 13 years ago

    Hi Russel,

    That aluminum balance tube is $110.
    You could shorten yours on the long end and use a longer rubber tube and cut it in the middle and install a small barbed fitting for your new tube.

    You know you really don't need manifold pressure for a 912UL. It won't really help you with much. Most people with 912 engines don't have them.

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

      
    Report

  • Re: Compensation Tube

    by » 13 years ago

    Thanks Roger for your reply. I have an inflight adjustable prop and live in the desert. Rotax recommends a manifold pressure gauge for adjustable props. When cruising in the summer, temps begin to rise with a coarse pitch. I'm having a hard time finding the proper sized barbed "T".Your suggestion is exactly what I'm doing if I can find the "T".

    Thanks
      
    Report

  • Re: Compensation Tube

    by » 13 years ago

    Hi Russell,

    I should not have just assumed you had a ground adjustable prop. :blush: I'll try to be a little more intuitive next time. :)

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

      
    Report

  • Re: Compensation Tube

    by » 13 years ago

    You could cut out about 3 or 4" of the tube. slip a piece of rubber tubing over each end of a brass tee and put the whole thing in the gap you cut out. To get the ends of the tee assembly to match the compensation tube you may have to make the tee. You could use an all female brass street tee, 1/4 npt, and screw into that whatever size hose barbs you need. you can get it all at Lowes or Home Depot. If you want to get really fancy, you could use an aluminum AN917 tee and aluminum AN840 hose barbs of the appropriate sizes. The aluminum fittings from Aircraft Spruce are actually cheaper than the brass.

    Bill.
      
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  • Re: Compensation Tube

    by » 13 years ago

    Bill

    Great minds think alike!!! I'm holding in my hand those AN fittings. It's just that they are kinda big. I was hoping to find a barbed T 1/2X1/2X1/4...brass, aluminum or steel that was all in one. It would be smaller.

    Thanks
      
    Report
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