C-182 carb-heat causing rough running.

Newps wrote in message ...
R.T. wrote:

Hello all, may be some one could help me out. I purchased a 1967 C-182 K
this summer with a Continental 470.

I also have the 67 182.


When I pull out the carb the RPMs drop
considerably(200+rpm).

Yep.


I believe that it is creating a rich mixture as on a
run up I can get the rpms to come back up by leaning.

Pulling carb heat on any plane always makes the mixture rich.


I guess I'm just not
used to this kind of massive change and I'm wondering if its normal and if
there is anything I can do about it.

It's normal. I don't use carb heat because it's not needed where I
live. Don't use carb heat in the pattern just because the checklist
calls for it. Use it when you need it.

The O-470s in any Cessna I've flown had strong carb heat,
probably too strong, and we used to use partial carb heat unless the
icing risk was high. A carb icing chart is helpful so that you can use
whatever heat necessary without creating carb ice farther up in the
intake manifold as partial heat can sometimes do.

Dan