" wrote:

"C J Campbell" wrote in message ...

Did you try leaning aggressively? An iced up engine will run richer
and richer as the air portion of the venturi is closed off with ice.

Uh .. the section of the carb that ices up is the area around the butterfly valve.
This is located at the junction of the carburetor and the intake manifold. This
section carries the fuel/air mixture. AFAIK, there's no such thing as "the air
portion of the venturi" - the venturi is the section of the carb in which the fuel
mixes with the air.

In any case, the mixture will not change appreciably as the carb ices up, and this is
why it's not taught to students. Carburetor heat changes the mixture, though, and
this *is* taught to students.

George Patterson
If you want to know God's opinion of money, just look at the people
he gives it to.