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I am flying a Remos GX, Rotax 912ULS,with a Dynon EMS display. While cruising at 6500 feet, 5000 rpm I got two simultaneous warnings - high CHT and high fuel pressure. CHT had gone up to 246 and fuel pressure up to 5.5. Before I could do anythng they both dropped back to normal. 212 for the CHT and 4.3 for the fuel pressure. A mnute later the same thing happened. This time I was watching and both CHT and fuel pressure jumped up nearly instantaneously. Also noted that both EGT's dropped about 400 degrees at the same time. Oil pressure and temp were stable in the green. Lasted a couple of seconds and then back to normal. Happened one more time so I pulled the throttle back to 4600 and flew another 20 minutes without any further problems.
  • Re: High CHT

    by » 12 years ago


    Hi Dick,

    You from Marana, AZ?
    I have seen these do the very things you have stated with Dynon. More time than not with a composite plane it is a poor ground or a loose wire.

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


  • Re: High CHT

    by » 12 years ago


    I have the Dynon D120 EMS hooked to my 912ULS and would agree it sounds like a ground , or chaffed ,loose wire somewhere. If you check out your D120 install manual it lays out what color wire does what , the more than one at a time high readings sounds like a common ground , which can be used on certain sensors. If I remember right the EMS case itself needs to be grounded as well.

    Hope this helps,

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