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Getting high EGTs and high MAP on my Rotax 912iSC, even on relatively cool days. This morning OAT was about 76 degrees, DA was about 1,700' at KSEE. On climb-out (100% throttle) MAP went into the yellow and one cylinder (#4) went into the red, all cylinder EGTs were high but not yet in the red. In an Aeroprakt A32, EGT redline is 1,616 degrees. Reduced throttle to below 90% and the readings both went back to the green area.
Ground Adj prop (E-Prop) is set per factory recommendation - I achieve about 5,500 RPM in level flight. Burning 100LL. Cleaned K&M air filter and re-oiled it per instructions. I was alone in the plane with just under 1/2 fuel tanks. Engine has about 460 Hobbs, 350 Tach.
I will pull the fault logs tomorrow. Not sure what to even look at. Suggestions?

  • Re: High EGTs and high MAP reading

    by » 3 weeks ago


     

    When you get your ECU logs, upload them here, and we’ll take a look to see what’s going on. Also, double-check your air filter to make sure it isn’t over-oiled, as this can cause your MAP to increase due to reduced airflow. Remove the air cleaner and inspect the induction tube and throttle body to ensure there is no residue from air filter oil. Over-oiling the air filter is easier than you might think; even experienced mechanics have done it before.


  • Re: High EGTs and high MAP reading

    by » 3 weeks ago


    Here are the fault logs.

    43091_2_200039_Logs_7705376_2025-02-26_12-20-20.zip (You do not have access to download this file.)

  • Re: High EGTs and high MAP reading

    by » 3 weeks ago


    BTW Thank you for the help.  My first entry above was after I had re-cleaned the air filter and oiled it much more lightly.  I had oiled it too heavily the first time (IAW the K&N instructions).  One suggestion I've received is to reduce the propeller pitch, aim for maybe 150 RPM increase in level flight at 100% throttle.  I think that recommendation makes sense, but I'd love to hear your review of the fault logs first.

    Where is the induction tube?  Is it before or after the throttle valve?  There is no visible oil on the upstream side of the throttle valve.


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