Carb icing

by Louis Mego in 912 / 914 Technical Questions 10 years ago

I have over 750 hrs on my 912 and have never experienced carb icing. Can I assume that the Bing carb is immune to icing?
Regards, Louis.

Re: Carb icing

by Roger Lee » 10 years ago

Roger Lee

131 5.38k 5.44k

Hi Louis,

It isn't immune and it can happen, but doesn't seem to happen as frequently in the variable throat carb as a standard carb. It is a good idea to have carb heat of some sort. Some areas of the world would be less likely than others to get it. I live in a very dry warm climate so I wouldn't be as prone to it as let's say someone in the U.K. where temps and humidity may make it more likely.

Maybe Rob or Conrad can chime in here with more real time science and experience.

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

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Re: Carb icing

by Rich Provenzano » 10 years ago

Rich Provenzano

20 59 30

Louis,

I picked up carb ice with the 912 ULS 100HP in a Sting S-4 going to NC and return to PA and I have the hot water jackets installed around the carb bodies.

I believe I was at 4500 and 5500 respectfully on those trips when I had a 150 RPM drop from 5250 to approx 5100. It took full throttle and a minute or so,if I remember correctly,until the RPM's came back to 5300.

Some rising moisture was present, not much at all, just enought to rise into a haze layer above.
OAT were in the >40*F range.

I may have had an air lock in my water jackets, as the engine was removed and replaced. I never had experienced carb ice before that in 135 hrs of operation.

I was surprised but it does happen.

Remember my aircraft may be cowled differently than yours and my air filters are exposed to open air under the cowl. I do not have an air box.

Rich

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