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Rotax 912uls Failure of both CDI modules

in General Tech Discussion 11 years ago

  • Re: Rotax 912uls Failure of both CDI modules

    by » 11 years ago

    We all know the CDI modules are substained to high temp rought conditions. So why doesn`t rotax develope some that arent that heat sensitive :D ? I bet the potential market would be huge !
      
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  • Re: Rotax 912uls Failure of both CDI modules

    by » 11 years ago

    I'd like to throw this out there just to see what you think.

    Lots of owners have moved the oil pressure sensor off of the engine and mounted them to the firewall to eliminate sensor failures due to vibration. It would seem that the same could be done with the ignition modules to avoid heat and vibration. It appears to be just a matter of extending the module wiring. Any reason this couldn't be done?

    Bill
      
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  • Re: Rotax 912uls Failure of both CDI modules

    by » 11 years ago

    Bill, I have moved both cdi's and coil behind the engine with blast tubes on.
    The DynAero MCR's also does this.
      
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  • Re: Rotax 912uls Failure of both CDI modules

    by » 11 years ago

    There shouldn't be any physical reason this couldn't be done. It would be just wiring and a finding a suitable mounting spot. With 22+ years of 912's out there the percentage of this failure has to be extremely small or most of us would be having issues all over the world, whether it be a certified aircraft or some type of a light non-certified aircraft. That's tens of thousands of engines. I'm sure some suffer, but is it worth all the time and effort for a couple of aircraft? I don't know?

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

      
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  • Re: Rotax 912uls Failure of both CDI modules

    by » 8 years ago

    Hi Everyone. My name is Jerry Stirton and am Marcelo's american brother-in-law. Marcelo asked for my help as he is Brasilian (Portuguese spelling) and has sometimes had problems in understanding English (slang, abbreviations like SB, etc.).

    I am a retired mechanical engineer with extensive time working with truck transmissions and plenty of time with forklift trucks and their Continental and Ford cyl industrial engine.

    This is Marcelo's 3rd plane. The owner of the Rotax Service Center is a long time personal friend of ours. The mechanic has been with him for years and he said all work on the engine was to Rotax specs.

    Marcelo and his father bought the second plane (all of which are from the same manufacturer - our friend who used Rotax and the Service Center). Marcelo's father was killed when the engine stalled at take-off. He plowed into a berm and the destruction was too severe to find a cause.

    This engine failure was in-flight but Marcelo was able to land the plane without damage. He said he was at cruising speed in a straight flight from the airport.

    Although I agree the photo's indicate a connecting rod failure of the forward starboard piston, it is hard to understand why, with the people I know servicing the plane. The one strange thing I noticed was the rod's connecting bolt tabs on both sides were broken off but I am in Michigan.

    By this message I am asking Marcelo to find the connecting rod's bearing cap (the part that holds the rod to the crankshaft) and send me a photograph. Get as many pieces as you can. Also, check the crankshaft journals and see if the lubrication holes are clear so oil was able to lubricate the connecting rod journals.

    We want to thank everyone who will participate because knowing the people involved I am suspicious of the engine and you all would be less biased.
      
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