Just had my powerflo 100 hour inspection

[4RNB]

Went to do a local flight after my powerflo was checked. On run up when checking carb heat I did not notice a drop in RPM. I did three touch and goes, did not notice any issues.

Temp on the ground 30
Dew point 18
49% humidity
DA 1853

Does carb heat always affect RPM, and if so what should I be looking for at this point?
Thanks.

 

[MauleSkinner]

Where was your mixture?

 

[4RNB]

I think reading other stuff pertaining to this, the "hose from the muff to the heat box" was not reattached.

I know it was not reconnected because I was there. A big thanks to Dan Thomas for responding on that other forum!

https://www.pilotsofamerica.com/community/threads/applied-carb-heat-nada.122650/#post-3096464

 

[4RNB]

Where was your mixture?

Full rich.

 

[MauleSkinner]

Full rich.

At full rich here should be a drop, because you’re making an already rich mixture richer.

 

[MBDiagMan]

Rather than speculating based on temps and such, decowl it and investigate. I expect that is the only way you will find the problem.

To respond to your question though, was the engine warm enough yet to apply heat to the carburetor when checked? If it was still cold you were not applying heat. I have flown some planes tha even on a cold day, the box will have heated enough by the time I’m at the run up box to give an RPM drop while other airplanes are not warm enough by that time to give a noticeable drop.

Hope this rambling helped.