Here's another tip for carbureted engines only. When operating at full
throttle, it is often helpful to back off on the throttle until you see just
the tiniest drop in MP (if you have a MP gauge, otherwise look for the
slightest drop in RPM), and leave it there instead of fully open. That cocks
the throttle plate just enough to set up a slightly turbulent flow, and that
helps mix the fuel and air for better combustion. A touch of carburetor heat
may help, too.

Using our JPI EDM700 engine analyzer as our guide, we usually can get
all 6 cylinders within 70 degrees of one another using the "pull the
throttle back a hair" method at altitudes from 4500 to 8500 feet.

At full throttle, we're lucky to get them within 150 degrees of
matched.

Never tried the carb heat thing. We don't have a carb temperature
gauge.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"