john smith wrote:



Dan, I have a couple hundred hours behind the normally aspirated 0-470
Continental in C182's.
Anytime there is significant moisture in the air, the carb will ice up.

Not true. I recently sold my 182 after having put 1000 hours on it.
Never had it ice up, even after trying. I would go out on those rare
days here when we had fog and fly just as it lifts, still 90 somethun'
percent humidity. Couldn't make it happen.


I will not fly with carb heat on constantly.
I read somewhere in the past (years ago, don't recall where) that flying
with constant carb heat moves the ice farther down the throat where no
heat will be available to melt it.

Old wives tale. Cessna Pilots Assoc reccomends whatever amount of carb
heat is necessary to keep the carb at about 45 degrees in cruise. Also
has the effect of evening out the fuel mixture so the engine ran smoother.