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Dear Sirs, 

 

I've inspected a 582 UL engine for which the owner says that it has its CHT probe sensor in a bolt between the cylinder heads. The measured temperatures in this configuration are in average of 70 º C. But considering the manual, the location of this sensor is relative to Air-Liquid Temperature, not the CHT.

My question is: what is this sensor measuring? It could not be measuring the coolant temperature, right?

The manual refers that for CHT should be measured on the spark plug seats, hence the temperatures will be higher, concordant with the manual declared values (110ºC to 130ºC). 

Could you please clarify which sensor is this, and what are the operating limits?

Waiting for your comments.

Best Regards,

9498_1_image_2022-10-14_161854146.png (You do not have access to download this file.)
  • Re: CHT sensor

    by » 4 months ago


    I believe your measuring coolant temp


  • Re: CHT sensor

    by » 4 months ago


    The Sensor "at spark plug Seat" is CHT
    The "Air and Liquid" Sensor in the head is COOLANT Temp.

    50/50 Ethylene Glycol Coolant is commonly limited to 120°C (248°F) because it will boil over at ~125°C ( ~260°F) in a Pressurized cooling system.
    50/50 Ethylene Glycol Coolant will boil at ~112°C  (223°F) In an Un-Pressurized cooling system.

    So 110 -120°C would be a reasonable Max COOLANT Temp.


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


  • Re: CHT sensor

    by » 4 months ago


    Hi! Thanks for your reply

    So, that sensor location is the only previewed place where should be read the temperature? Or there is another "offiicial" location?  Because, being the coolant temperature, the Operators Manual defines the Max Temp as 80ºC. 

    My only concern was the proper installation of the sensor, regarding the location established by the manufacturer.

     

    Thank you for your cooperation.


  • Re: CHT sensor

    by » 4 months ago


    I have No direct experience with the 582, but according to the Manuals, that certainly appears to be the correct location.
    I find 80°C questionable Low, especially when the Head Temp is allowed to go to 130°C.

    Perhaps someone with Direct 582 experience can comment on typical Coolant Temps.


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


  • Re: CHT sensor

    by » 4 months ago


    Yes, I found it a bit low too. Thank you Bill. Let's wait for a comment on that.

     

    BR


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