On Thu, 16 Sep 2004 22:16:31 -0400, "Morgans"
wrote:

"john smith" wrote in message
. ..
If I go a few degrees lower, the engine sputters.

Do you have GAMI injectors? If not, "Thou shalt not run LOP!"

Follow engine manufacture's instructions, if you can't get down to their Max
CHT's.

I strongly agree. If you cannot reach lean of peak without having the
engine run rough, then don't.

Because of your particular fuel/air distribution situation, it appears
you will have to run rich of peak at all times in order to achieve
smooth running. I suggest you lean to peak and then richen for the
POH suggested temps and just accept the higher fuel burn than running
lean of peak offers. It's not good to be running CHT's higher than
400F. It's not great to be running even that high, you should try to
keep them under 400F.

This is all spelled out in minute detail in John Deakin's AVweb column
"Mixture Magic". See below.

http://www.avweb.com/news/columns/182084-1.html

Corky Scott