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Hi

My EGTs on my RV-12 with a 912ULS have always been about 1370 degrees F in cruise between 5200 and 5300 rpm.  Coming out of a recent annual with no carb work other than weighing the floats my two EGTs were only 450 degrees F from idle to cruise.  I checked one with a heat gun and got it to 500.  I then slaved in a new probe with no change in temps.  I have confirmed in the DYNON SKYVIEW EMS SETUP both probes are setup for type K thermocouples.  We did swap in new spark plugs and the engine runs just fine.  Is it possible to have such low EGTs and run fine?  Any ideas on what to try next?   CHTs are between 160 and 170 degrees as usual.  Any help is appreciated. 

Thanks

Bill Gardner 

  • Re: Really Low EGT Readings

    by » 3 months ago


    EGT temp readings vary based on the distance from the exhaust port. Temperature drops about 100 deg F for every inch from the exhaust port. They will last longer at the lower temps. I think you have nothing to worry about.


  • Re: Really Low EGT Readings

    by » 3 months ago


    There is no way that EGT's went from 1370F to 450F. Gas will at 495F and that's at standard atmospheric conditions which aren't present inside your cylinder so you'd need to increase that temp for continued combustion. Gasoline can burn at temps around 1500F depending on some other factors. I doubt all your probes went bad at the exact time and at the exact same temp. Check for an issue beyond the probes.


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


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