This is not an MG question, but I figured someone like Barney may have
background knowledge on this. I have a car with downdraft IDA weber carbs
- one per cylinder - no chokes. It's a little tough to start cold, but it
works. Anyhow, twice, my car has started to run crappy in the snow. When
I stopped driving I opened up the engine compartment to see that there was
frost on the outside of carbs. The first time it was one carb. Today it
was 3 of the 6 showing frost on the outside of the carb. I haven't had
the opportunity to look inside, but suspect its icing in there too. What
I don't know is this - what exactly causes icing?? I know it's the
venturi effect, evaporation, and moisture - but is there a lean or rich
condition that also increases the likelyhood of icing?? What is the
effect of carb icing - do I end up with a chunk of Ice going in my
intake?? Or maybe a jet blanking off due to ice and then a lean mixture??
Phil Bates
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