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balance tube

in General Tech Discussion 11 years ago

  • Re: balance tube

    by » 8 years ago

    Totally agree. But never the less, they should not foul after a few carb syncs ... Will use a special "tube pinch" plier from now.
      
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  • Re: balance tube

    by » 8 years ago

    Hi Willy,

    What caused the fouling? If it was crimped on only the rubber hose, the hose was under 5 years old then what caused it to be a problem? I have never seen one of the balance tube hoses have an issue.

    I to prefer to separate the carbs. I usually take the hose off on the left carb and hook up my gauges there. Then I know there are no leaks between the carbs and no crushed hose.

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

      
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  • Re: balance tube

    by » 8 years ago

    Hi Roger,
    No idea what caused it. The engine (and tube's) are new (jan 2016). I believe It is better to take the hose off. But as I understand, using a plier is standard practice on a rotax. The tube was weakened and even collapsed during flight causing vibrations. Bringing back the throttle to 4000 rpm reduced the vacuum and so the tube resettled and the vibrations disappeared. On ground the engine vibrated between 2500 and 3500. Same vibration you feel during carb sync procedure.
      
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  • Re: balance tube

    by » 8 years ago

    You sure the tube is a stock Rotax rubber hose balance tube? Those will not collapse under operation.

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

      
    Report

  • Re: balance tube

    by » 8 years ago



    Should be. New engine (140 hrs) ...

    Collapsed due to the damage.
    balancetube.jpg (You do not have access to download this file.)
      
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