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912ULS carb compensating tube

in 912 / 914 Technical Questions 6 years ago
Hi - the metal manifold/carb compensating tube linking my intake manifolds needs replacing. Is there any reason why you would need that exact metal tube (I don't use the pressure gauge fitting on it) or can I simply use some rubber hose to connect?

  • Re: 912ULS carb compensating tube

    by » 6 years ago

    Not sure how that would get damaged, but I'd just buy a Rotax one from a distributor.

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

      
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  • Re: 912ULS carb compensating tube

    by » 6 years ago

    Between you and me, I doubt you need to use an exact replacement.
    However, you should probably not reduce it ID and/or its volume.
    Appearantly, the larger the ID/volume the smoother and lower (if set so) the idle (and vice versa).
    Give it a try and let us know about your practical experience.
    Peter
      
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  • Re: 912ULS carb compensating tube

    by » 6 years ago

    I can see how the tube can get damaged when you consider how the hoses grip onto it when you try removing them for carb syncing. I always wondered why Rotax didn't just use a hose instead of the tube.
      
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  • Re: 912ULS carb compensating tube

    by » 5 years ago

    I just found mine damaged!  Almost wore a hole clean through the aluminum.  How?  It was sitting atop the aluminum-foil-fire sleeves that come standard on TL Ultralight airplanes, including my 2007 Sting.  After 2,600 hours sitting (and obviously getting continuously "rubbed") there, doing its job, I removed it to install a new 66mm rubber hose on each end.  The photo shows what greeted me!  Needless to say, there's now some insulation there to prevent the repaired tube from "getting rubbed raw" again.  lol.

    damaged cross-over tube

      
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