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I own a 2008 CTLS, with Rotax 912 ULS. It has about 500 hours, with not a problem at all; and is a joy to fly around the islands. It is hangered, and is pampered way too much. As to the above topic, my CHTs always stay in the green....so far....

Now; it is recommended that each cylinder has a probe to measure each CHT, so that if the temperatures slowly and inexoriably climbs above 400 deg towards 450 deg--perhaps a very rate occurence but a "signature" for developing detonation on the path to pre-ignition, that an aware pilot can do something about it before having serious engine problems.

My EMS only displays two CHTs; I believe one on for cylinder 2 and the other for cylinder 4 ( I "assume" that these are normally the hotest cyclinder heads, hence their designation ).

Has anyone heard of an ULS going into detonation / pre-ignition, and if so under what conditions? ; And further, are my two CHT probles on what I think are the hotest Cylinder Heads sufficient to get early warning and avoid this serious problem ?

Thanks

Scott
Kona, Hawaii
  • Re: CHT gauges

    by » 10 years ago


    Hi Scott,

    I own a CTSW and I'm a service center for FD. You are just fine with the two CHT's. These are on cylinders #2 & #3. Normal CHT in your CTLS for your temperature climate range is between 190F - 220F. You do not need all 4 CHT's. No CT is been to detonation that I know of. There are 1800+_ CT's worldwide and none are having a problem with detonation so long as you don't alter your carbs and or engine setup.

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


    Thank you said by: Scott Church

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