CHT sensor anomaly

Category: 912 / 914 Technical Questions 3 months ago
  • Re: CHT sensor anomaly

    by » 3 months ago

    Looking at the chart..

    Both CHTs increase after start with CHT1 out running CHT2

    Just as CHT2 reaches 85° where you would expect the Thermostat to open BOTH CHTs temp decrease initially and then equalize.

    As I understand it, when the thermostat is CLOSED it blocks the flow to the radiator.

    How does the bypassed coolant return to the water pump when the thermostat is closed?

    There is a point where the Left and Right flow join together and there might be a strange fluid dynamic issue happening there.


    - - -

    The temperature also started to equalize right after you reved up the engine.

    This would also have the effect of drastically changing the coolant flow and possible changing the flow dynamics.

    It would like to see a warmup plot at constant RPM.  Idle only. 



    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated.

  • Re: CHT sensor anomaly

    by » 3 months ago

    Could you remove the thermostat and see if the problem goes away as a test?

  • Re: CHT sensor anomaly

    by » 3 months ago

    i also suggest the removal of thermostat and after that hot run to see the behavior of CHT (Left and Right).

    and one thing do more , swap the wire connection i.e left side connect to right and vice versa and observe the temperature reading that may confirm if temperature anomaly behavior exist the culprit  is sensor side. Replace the sensor.    

  • Re: CHT sensor anomaly

    by » 3 months ago

    We already did wire exchange, sensor change, sensor is ok, wires are ok.

    Thank you said by: RotaxOwner Admin

  • Re: CHT sensor anomaly

    by » 3 months ago

    We will try to remove the thermostat, I will inform you about the results.

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