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Large rpm drop when applying card heat..

 
Comanche Engines and Propellers
Last Post by Kate 5 years ago
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 Kate
Admin
Joined: 5 years ago
Posts: 138
Topic starter 10/04/2020 2:15 pm  

 

  • February 12, 2020 at 03:16 #107125 Trash | Reply
    106696

    Participant

    With engine running and 1500rpm there is a large rpm drop (300-400rpm) ..Removed the scat hose between the heater shruod and the air intake .. the same rpm drop was noticed when carb heat re-applied..I assumed with no hot air from the heater there would be no noticable rpm drop.

  • February 18, 2020 at 01:51 #107147 Trash | Reply
    William Hughes

    Participant

    Now that is interesting. The rpm should change a bit but a large reduction in rpm at high idle with the carb heat applied and NOT routed through the heater is interesting. Might be that it was still pretty hot in the engine cowling so it was still drawing in higher temperature air?

    William

 


   
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 Kate
Admin
Joined: 5 years ago
Posts: 138
Topic starter 10/04/2020 2:21 pm  

My previous post did not include the aircraft is a PA260 engine is a 540E


   
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