drauk - only flown a C182 once so far (as my last 2 planned complex differences training trips have been weathered off), but have done some ground school type work with an instructor on this. Fairly obviously, you won't see a variation in the RPM due to the CSU when operating carb heat, so all there will be is a slight change in manifold pressure. Due to the way that carb heat operates, it actually doesn't have a great effect on manifold pressure. I'm not claiming expert status on this and am ready for
and the great and good telling me I'm talking like this
