Carb freezing while D17 is running?

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   So the other day, I used my D17, series II to pull my drag harrow across the garden a few times. When I parked it, there was a thick later of frost on the top of the carb and the bottom of the intake manifold, while it was still running. Any ideas on this? I know I need to rebuild the carb this winter, but this honestly has me stumped. I have replaced the float, and that is all I've done to the carb. Temps at the time were in the 40's. The Venturi did seem loose when I had the carb apart, still don't know if that is normal, I would assume not.
As always, any help is greatly appreciated. Thanks in advance!

Edited by D17SeriesIV - 02 Apr 2015 at 8:40pm

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D17SeriesIV Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 26 Jan 2015 Location: Hartwell, GA Points: 82	Post Options Post Reply Quote D17SeriesIV Report Post Thanks(0) Quote Reply Topic: Carb freezing while D17 is running? Posted: 02 Apr 2015 at 8:40pm
	So the other day, I used my D17, series II to pull my drag harrow across the garden a few times. When I parked it, there was a thick later of frost on the top of the carb and the bottom of the intake manifold, while it was still running. Any ideas on this? I know I need to rebuild the carb this winter, but this honestly has me stumped. I have replaced the float, and that is all I've done to the carb. Temps at the time were in the 40's. The Venturi did seem loose when I had the carb apart, still don't know if that is normal, I would assume not. As always, any help is greatly appreciated. Thanks in advance! Edited by D17SeriesIV - 02 Apr 2015 at 8:40pm

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DougS Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 03 Nov 2011 Location: Iowa Points: 2490	Post Options Post Reply Quote DougS Report Post Thanks(0) Quote Reply Posted: 02 Apr 2015 at 9:13pm
	It was a cool humid day?

Dakota Dave Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: ND Points: 3971	Post Options Post Reply Quote Dakota Dave Report Post Thanks(0) Quote Reply Posted: 02 Apr 2015 at 10:46pm
	Carburetor icing normaly occurs in temps between 40 and 80 degrees and the temp dew point spread is 5 deg or less. Air rushing thru the Venturi lowers the pressure and cools the air. That is why carbed airplanes have a carb heat knob. The worst conditions are flying in the clouds at about 60 deg. I've had the engine go from running great to no power output in a couple seconds. Edited by Dakota Dave - 02 Apr 2015 at 10:49pm

Gerald J. Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: Hamilton Co, IA Points: 5636	Post Options Post Reply Quote Gerald J. Report Post Thanks(0) Quote Reply Posted: 03 Apr 2015 at 5:28am
	Carbs get cold. There's nothing wrong with the carburetor, you just need some carburetor heat. That's sometimes why there's metal to metal contact between intake and exhaust manifolds. Carb heat tends to be supplied by exhaust manifold heat, sometimes guided by tin work. Or by arranging the intake air to be warmed by the exhaust manifold. E10 fuel should help keep the inside passages from freezing up but might need the mixture richened slightly for best running. Gerald J.

Dave H Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 11 Sep 2009 Location: Central IL Points: 3583	Post Options Post Reply Quote Dave H Report Post Thanks(0) Quote Reply Posted: 03 Apr 2015 at 7:24am
	I would not even give it a second thought unless it is effecting engine performance.