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Vibration

in 912 / 914 Technical Questions 7 years ago

  • Re: Vibration

    by » 7 years ago

    I had a similar problem and it turned out to be one of the throttle cables binding very slightly. As I slowly advanced the throttle one carb would lag slightly until that cable got past the higher friction point and the spring would catch it up with the other carb. It only happened when slowly advancing the throttle. The cable was pulled through the friction point easily but lagged a bit when it was pushed through it.
      
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  • Re: Vibration

    by » 7 years ago

    Thanks Tom, I'll take another look at the throttle cables for binding.

    Roger, still wondering about the gearbox oil leak. Do you think this is coincidence? Certainly unusual for an engine with only 10 hours on it... my mechanic is suggesting a gearbox tear down and inspection.
      
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  • Re: Vibration

    by » 7 years ago

    If the gearbox is leaking it needs to be fixed. Just pull it and you can do a cursory inspection just to see if it warrants a deeper inspection.

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

      
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  • Re: Vibration

    by » 7 years ago

    On RV-12 the right EGT usually runs about 100F hotter because of close proximity to oil tank.
      
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  • Re: Vibration

    by » 7 years ago

    EGT's aren't affected by oil tank temp. Only fuel burn within the cyl. as those hot gases exit out the exhaust. This like air intake to a cyl., fuel to that cyl. and EGT probe location usually shows up on screen numbers. The oil tank is only in the 200'sF and the EGT's in the 1250-1475F range.

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

      
    Report
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