) wrote in message . com...
I'll bet you are running unusually rich for whatever reason - even
with carb heat off.

To start off with though, the mixture distribution in carburated
O-470s is poor.


Whenever you pull carb heat on, the mixture gets really rich. You
can get most of the power back by re-leaning.

The distribution in O-470s can be fixed by running the carb heat such
that the carb air temperature is 10C. They will smooth out and even
lean of peak operations can be done. Courtesy of the excellent Advanced
Pilot Seminar course.

You DO have a carb temp gauge on this ice maker don't you?

Bill Hale