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Polishing intake manifolds

in General Tech Discussion 7 years ago

  • Re: Polishing intake manifolds

    by » 7 years ago

    Here is example of balancing tube on VW based engine
    ScreenShot2018-11-24at20.48.04.png (You do not have access to download this file.)
    ScreenShot2018-11-24at20.44.38.png (You do not have access to download this file.)
    Thank you said by: Garrett Wysocki
      
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  • Re: Polishing intake manifolds

    by » 7 years ago

    This may sound like a wet blanket, but

    The two key words here are VW engine. You can't use Continental, Lycoming, VW, Hurth or Jabiru when try to apply all their applications towards a Rotax. That VW is different than a Rotax and there are far too many things to list. It's loose tolerance, air cooled low compression, ect, ect.... It's just a different animal and has different specs and needs. Rotax has spent millions of dollars and man hours testing and designing and couple that with more than 5 million run hours and more than 50K engines and all running the majority portion of light aircraft in the world. Unless someone has dyno testing and thousands of hours on a different spec Rotax engine it would be just guess work at best as to any benefits.

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

      
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  • Re: Polishing intake manifolds

    by » 7 years ago

    We are in experimental aviation and this was very good experiment. If someone not comfortable with this one - no need to change anything at all. It was improvement for sure on my engine. Time will tell.
    fullsizeoutput_12d9.jpeg (You do not have access to download this file.)
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    IMG_1008.JPG (You do not have access to download this file.)
      
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  • Re: Polishing intake manifolds

    by » 7 years ago

    Just curious, What instruments and test did you run before and after to know it was better?

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

      
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  • Re: Polishing intake manifolds

    by » 7 years ago

    If it helps with the vibration I am all for it. Eric Tucker a Rotax factory expert explained and acknowledged the vibration (especially in the midrange RPM's) in a heavy maintenance class, it has to do with the with the different length of the intake manifold tubes between the front and back cylinders. This engine should have come with a vibration sensor and a warning light or meter on the panel. Motor vibration causes everything attached to wear out prematurely. It is good for Rotax parts and service business.
      
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