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High EGT

in 912 / 914 Technical Questions 5 hours ago

High EGT at low air speed & engine rpm

I think I know the answer to why the above occurs on occasions but would like to know for sure

Aircraft details; Sonex Legacy,  Rotax 912 ULS, Airmaster Constant Speed propeller.

In circuit

Airspeed: 80-90 knots

Engine speed: 4800- 5200 rpm

Prop: Take Off mode.

When I apply more power & rpm, the EGT responds immediately, by going down.

Please explain😈

 

  • Re: High EGT

    by » 2 hours ago

    It runs leaner down in the 4K rpm's and richer in the higher 5K rpm's.  So lower EGT'S in the 5K rpm's.

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

    Thank you said by: Sean Griffin
      
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  • Re: High EGT

    by » one hour ago

    Thanks Roger,

    Thats interesting - here was me thinking that the CS prop was loading the engine below peak torque, causing the EGT to rise ahead of CHT/Coolant.

    My previous 912 ULS, with ground adjust/fixed pitch, never had this indication (that I recall) Could loiter all day in the low 4000 rpm's.😈

      
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