Carb icing up?

Jim in Ma. · Jul 30, 2013

The carb on the Massy Mustang is icing up all over the outside. I know I have read somewhere why that happens but don't remember where.
Does anyone have an idea?

robgIN · Jul 30, 2013

it is caused by the gas vaporizing as it goes through the venturi, changing states from a liquid to a vapor resulting in a rapid temperature drop. Same principal that makes your ac work.

Ellis Kinney · Jul 30, 2013

It is normal. My M Farmalls all do it, even on a warm day. Ellis

Frank 41 · Jul 30, 2013

Our 7700 gas combine used to do that around 40 degrees with the humidity just right. Deere had a kit to get heat from the radiator to the carb that eliminated the problem. Years ago we had a ford that did it when it was hot. Some said to put a clothes pin on the gas line. My dad did the right thing. He got rid of it.

cole in mo · Jul 30, 2013

It happens on roads too, ever read a sign that says, bridge may be icy?

souNdguy · Jul 30, 2013

make a cheap-o heat riser from some aluminum foil and make a 'tent; around the carb and exhaust manifold. should help it if it is freezing up bad.

grs0820 · Jul 30, 2013

robg is correct, Gas vapors at a very low point , like 100 deg. A ac is 134 being changed to a gas to a liquid to a gas .and the cool air is a byproduct of this change.On a carb , If I see this I know it is working right, wouldn"t worry bout it..

Andy C · Jul 30, 2013

Certain older aircraft are pron to this in certain conditions (NOT a good thing!) The solution there is to feed heated air through the carb.....less dense air means less power but that is infinitely better than an ice cube in the venturi!

FBH44 · Jul 30, 2013

My understanding is taht the vaporization of gas from a liquid to a vapor, and the accleration of the gases as they go thru the venturi tube, soak up a lot of BTU"s heat. That loss of BTU"s cools down the metal of the carb, and in humid ordinary weather you"ll see dew or moisture condensing on the outside of the carb. Means everything is OK. In fact, the cooler the outside, or the more moisture in the air, the closer the dew moisture is to forming ice, and that also is OK. Means it is OK.

rusty6 · Jul 30, 2013

Carburetor icing can be a problem here, more often in winter but it can happen any time of year if the humidity is right. The secret is to get that intake manifold and carburetor warmed up enough that ice will not accumulate. Just shut the engine down for a few minutes allowing the engine heat to warm up the intake manifold and melt the ice. After that mine work just fine with no more icing.
And that clothes peg on the gas line thing... it was supposed to be a cure for vapor lock, a totally different problem than icing..

old · Jul 30, 2013

Caused by the atomizing of the gas as it flows up and goes from liquid to vapor. If it did not do that you would have a problem. Back before there was electricity and A/C etc the Indians of the south west use it for cooling with water and hides. So if your carb does not do that you have problems and just normal

Pete in MD · Jul 30, 2013

Not the same thing Cole.

D beatty · Jul 31, 2013

I have put a jacket around muffler and a pipe from jacket to top of air intake. It will stop icing and in winter the tractor run like it was middle of summer. I disconect mine in summer.

Carb icing up?

Jim in Ma.

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robgIN

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Ellis Kinney

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Frank 41

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cole in mo

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souNdguy

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grs0820

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Andy C

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FBH44

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rusty6

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old

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Pete in MD

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D beatty

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