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What is normal range for CHT on 912 ULS?

in 912 / 914 Technical Questions 11 years ago
I understand the max is 150 deg C but is there a 'normal' cruise range. I am currently cruising at 83/78 on the 2 cylinders with probes. As we go into winter, what would be considered too low?

  • Re: What is normal range for CHT on 912 ULS?

    by » 11 years ago

    Steve,

    That is about the same temp range as my engine at cruise. So far, I haven't seen a lot of drop in temps with winter flying. A friend of mine uses the high tech solution of duct tape on the radiator but so far I haven't seen the need to do anything.

    Bill.
      
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  • Re: What is normal range for CHT on 912 ULS?

    by » 11 years ago

    Thanks Bill, lets see how winter goes. I have just put a sleeve on the oil radiator so I can get it up to 100.
      
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  • Re: What is normal range for CHT on 912 ULS?

    by » 11 years ago

    Hi Guys....I am running a new 912uls with revised heads and I have a higher cht limit and I am told it is due to the probes now running directly in water and no longer in a air void (older engines)----before 95 degrees c and now 105 degrees c......hope this is ok....anyone with knowledge about this please advise and why do these engines run without a thermostat???
    BR ...Kappi
      
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  • Re: What is normal range for CHT on 912 ULS?

    by » 11 years ago

    Hi Andy,

    The 105C (221F) should be fine and is more accurate now with your new heads. What are your CHT's running? If you are using a 50-50 coolant mix then 248F should be the max temp. Some of the coolant temps from plane to plane will differ because of radiator size and air flow over the radiator which of course depends on radiator placement and of course OAT. Winter time coolant temps will be much lower than hotter summer temps. It will be different with Evens coolant verses 50-50 and there are a couple other minor factors. You're better off with 50-50.

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

    Thank you said by: Andy Kaspersen
      
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  • Re: What is normal range for CHT on 912 ULS?

    by » 11 years ago

    Andy,

    Kevin mentioned a device for thermostatic control under the general discussion heading. I haven't used one myself but have seen them in operation. They work like the oil thermostats in that they bypass fluid around the radiator. If they fail, they simply no longer bypass and you run cooler. Pretty much failsafe and easy to install.

    I have never had to use anything like that in my system. My engine is a fully exposed pusher installation and the temps do fluctuate summer to winter but never enough to be a problem since our winters in NC are usually pretty mild.

    Odd as it sounds, one thing that will bring winter coolant temps up somewhat is an oil thermostat. Easy to install, relatively cheap, and they consideradably shorten your preflight warmup time.

    Bill.
    Thank you said by: Andy Kaspersen
      
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