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On longer or grass taxi-ways and if I have to hold for a longer time before lining up the runway the CHT always rises to critical values (120 degr. C or more !!). The coolant is conventional (50/50).
Summer or wintertemp. gives no big differences.
In cruise CHT always comes back to normal values (95-100 degr.C).
The problem exists since new, now I have 90 hours.
What can be the cause ?
  • Re: high 912uls CHT values

    by » 13 years ago


    Hi Frans,

    I few different things could cause it and here are a few to consider.
    Poor coolant circulation i.e. coolant line has a reduction, too tight of a bend (small kink) (how is the oil temp)
    rpm while sitting
    prop pitch (what is your WOT rpm at your normal cruise altitude)(is it too course), prop pitch can have a significant play in temps
    tightly cowled engine with poor air flow

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


  • Re: high 912uls CHT values

    by » 13 years ago


    Sounds like the radiater is not getting enough air

  • Re: high 912uls CHT values

    by » 5 years ago


    Hello
    one of my two sensor of CHT gives very irregular values on my 912uls (VL3). It rise above 130°C several time during the flight, not specially when i'm climbing.
    The other sensor is very constant, oil temperature is also constant.
    I replaced the sensor but i've the same results.
    somebody could help me?

  • Re: high 912uls CHT values

    by » 5 years ago


    Hi,
    I suggest you swap connecting cables to rule out the wiring as a cause for high or erratic CHT values. If the high/erratic reading switches over to another cylinder the cause is neither sensor nor „real“ temp.

  • Re: high 912uls CHT values

    by » 5 years ago


    WHAT is the. minimum value of CHT and oil temp in cruise, ENGINE 914.?
    ENGINE health depends on oil temp. or CHT?
    :woohoo: :kiss:

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