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post #1 of (permalink) Old 02-23-2002, 11:22 PM Thread Starter
 
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What exactly is\"carb icing\"?

Ive heard a few things about it,and was wonderin just what it is.Does it happen only when cold?Is it when it feels as if your choke isnt fully opened?

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post #2 of (permalink) Old 02-24-2002, 02:16 AM
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Re: What exactly is\"carb icing\"?

Carb icing occurs when the air temperature cool and your engine has not yet warmed up. As the cold air is drawn through the cold metal of the carb and if the humidity is high enough to reach the dew point ice will form on the carb and intake manifold. This is why there is the the preheat tube running from the exhaust manifold to the air filter. There is also water running through the intake manifold and carb to aid in warming the air fuel mixture.


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post #3 of (permalink) Old 02-24-2002, 04:58 AM
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Re: What exactly is\"carb icing\"?

Carb icing can occure even when the engine is warm. I have had it happen to me before with my Sami and Weber carb. And to answer your question, yes, its as if the choke is still on/closed. As stated, the dew point has a lot to do with it but I think just as important is the temperatures and relative humidity. The icing happened to me the worst when it was somewhat cool(though it does NOT have to be freezing) and pretty humid.

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post #4 of (permalink) Old 02-24-2002, 09:20 AM
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Re: What exactly is\"carb icing\"?

I've solved my Weber from icing up by fabbing a shroud and bringing in a pre-heat hose to it. I also use a bottle of iso-heet at every tankful of gas. This fixed the icing problem.
Carb icing can occur up to 40*F and high humidity. It even can result in a sticking throttle in more extreme cases.

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post #5 of (permalink) Old 02-25-2002, 09:39 AM
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Re: What exactly is\"carb icing\"?

i had this problem this winter when it would be like 35 and drizzling outside. recently discovered that the rad hose to the carb was leaking badly and the carb wasn't getting warm. fixed it and no icing since.

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post #6 of (permalink) Old 02-25-2002, 10:28 AM
 
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Re: What exactly is\"carb icing\"?

Yep, I had the problem too, and it happened when it was around 35 degrees and high humidity. I ended up cobbleing my old heat collector from the stock exhaust manifold onto my header, and running the heat tube over to my air filter. I'm running a TD filter (looks like a K&N). Since doing this, I haven't had a problem. Doesn't look too cool, but it gets the job done, and so far, no more icing. In warm weather, I'll just remove this setup.
And like Crow says, a little Heet in the tank doesn't hurt either.

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post #7 of (permalink) Old 02-26-2002, 06:24 PM
 
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Re: What exactly is\"carb icing\"?

I was doing 70 on the highway and gaining altitude when I got the "frost".
Had to turn around and coast and then used my starter till I was walking distance (battery died) from the house. I had the preheat tube though.... Perhaps the door was defective?
Glad to be out of there, now where it's warmer, I am an air ramming fool

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post #8 of (permalink) Old 02-26-2002, 10:04 PM Thread Starter
 
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Re: What exactly is\"carb icing\"?

Thanks for the handy helps.I found that its my choke.It works fine for a while(open when hot,etc,etc)then for no reason my choke just up and closes.Guess its time for a pony.Ive kinda had it with stock carbs,even after rebuild.I know this has been covered but Are there any special alterations for a pony setup?Dont wanna start new thread,this has been beat to death I know[img]/wwwthreads_images/icons/crazy.gif[/img]

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