I've noticed that the base area at the bottom of my carb (where it meets the intake) is "sweaty". I can certainly slap some gasket seal on it to stop it but would like to understand why it's happening. It's a new flathead with a single double carb. My initial guess is blowby, but I'm just a FNG so hoping someone can offer some other thoughts or confirmation. PS. It's not fuel so I'm pretty sure I won't blow up. Pretty sure. Posted using the Full Custom H.A.M.B. App!
Quite possibly condensation caused by the heat of vaporization of the fuel. Did you ever notice the "frost" that forms on the air conditioning condenser of a modern vehicle? Same principle. Jon.
It's probably just condensation, on a low humidity day it won't show. Years ago when I ran a blown fuel Chrysler dragster there would be a thin strip of frost along the area where the blower joined the intake manifold. I always thought it strange that the heads would be red hot and the blower would be frosty. It all works like a venturi where the air expands going through an area of high pressure to low pressure and gives up heat.
If the throttle shaft is a bit worn it could be gas seeping out around it leaving an oily stain. Used to be pretty common on old cars.
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