The Ford Barn

foxfire42 · 07-18-2010, 01:53 PM

I have my A up in Western Washington for the summer and it’s running very rough. It runs like a top in Arizona. I’m being told (by a well respected mechanic) my carburetor is icing up from the moisture in the air and it has to warm up before it will run right. Any suggestions for speeding up this process or illuminating the need to for a warm up period? I know later cars (in the 50's) had a heat riser from the manifold to the carb but I don’t know if this option is available for the Weber. ANY suggestions appreciated. I’ll be driving it up to the BC meet and don’t want to waist gas and time warming before I can go anywhere.

Franchise_24 · 07-18-2010, 02:06 PM

Maybe let it run for a minute or two before you head out on your drive?

V4F · 07-18-2010, 02:50 PM

we used them on motorcycles . icing was a norm before warm . didnt seem to hurt anything . made em fast ! ................. steve

Old182 · 07-18-2010, 05:13 PM

FWIW: My Farmall Cub (updraft, potmetal carb) used to ice up all the time while plowing snow at around 30F. Typically, icing occurs when the temp is slightly above the freezing mark. The low pressure created by the venturi lowers the temp inside the carb and, should any moisture be present, well, it freezes. Carbureted piston-engine aircraft have carb heat for such situations. For the Cub, I made a simple light-weight aluminum baffle that I attached to the engine just forward of the carburetor to keep fan air from hitting it - did the trick nicely. You might consider trying something like that for the A.

Flathead · 07-18-2010, 05:25 PM

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If the icing is inside the carb throat you need to direct some warm air from around the exhaust manifold area into the carb. That should solve the problem. I had this same problem on a Pinto engine (years ago) and after repairing the OE heated air tube to the carb air cleaner the problem was solved. This car was factory equipped with that same weber carb.

07-18-2010, 01:53 PM	#1
foxfire42 Senior Member Join Date: May 2010 Location: AZ and WA Posts: 764	Weber Carbuetor Icing up on my A I have my A up in Western Washington for the summer and it’s running very rough. It runs like a top in Arizona. I’m being told (by a well respected mechanic) my carburetor is icing up from the moisture in the air and it has to warm up before it will run right. Any suggestions for speeding up this process or illuminating the need to for a warm up period? I know later cars (in the 50's) had a heat riser from the manifold to the carb but I don’t know if this option is available for the Weber. ANY suggestions appreciated. I’ll be driving it up to the BC meet and don’t want to waist gas and time warming before I can go anywhere.

07-18-2010, 02:06 PM	#2
Franchise_24 Senior Member Join Date: May 2010 Location: Lexington, Ohio Posts: 782	Re: Weber Carbuetor Icing up on my A Maybe let it run for a minute or two before you head out on your drive?

07-18-2010, 02:50 PM	#3
V4F Senior Member Join Date: May 2010 Location: ca. Posts: 2,522	Re: Weber Carbuetor Icing up on my A we used them on motorcycles . icing was a norm before warm . didnt seem to hurt anything . made em fast ! ................. steve __________________ V4f

07-18-2010, 05:13 PM	#4
Old182 Senior Member Join Date: May 2010 Location: Newburgh, NY Posts: 222	Re: Weber Carbuetor Icing up on my A FWIW: My Farmall Cub (updraft, potmetal carb) used to ice up all the time while plowing snow at around 30F. Typically, icing occurs when the temp is slightly above the freezing mark. The low pressure created by the venturi lowers the temp inside the carb and, should any moisture be present, well, it freezes. Carbureted piston-engine aircraft have carb heat for such situations. For the Cub, I made a simple light-weight aluminum baffle that I attached to the engine just forward of the carburetor to keep fan air from hitting it - did the trick nicely. You might consider trying something like that for the A.

07-18-2010, 05:25 PM	#5
Flathead Senior Member Join Date: May 2010 Location: Southern Maine Posts: 1,497	Re: Weber Carbuetor Icing up on my A Sponsored Links (Register now to hide all advertisements) If the icing is inside the carb throat you need to direct some warm air from around the exhaust manifold area into the carb. That should solve the problem. I had this same problem on a Pinto engine (years ago) and after repairing the OE heated air tube to the carb air cleaner the problem was solved. This car was factory equipped with that same weber carb.