Um...leaner is cooler, Dan! 50 LOP is about a hot as you can get an engine
without milting it down into slag.

But Matt, you are taking about rich or lean of PEAK.
But we are talking about FULL rich - as in mixture control full in.
That is waaay cooler than getting near peak - I monitor all 6 CHT's and
EGT's on my analyzer. At full rich, lean & temp goes up, richen & it
comes down. Add carb heat and it comes down more.
I also have a digital oil temp monitor - and the oil temp also goes up
as I lean and down as I reichen.

You can go over to lean of peak and it can be a very efficient thing to
do - but you had better be fuel injected with GAMI injectors, or therte
is a good chance you will melt it into slag as you suggest.

Thanks to everyone for their responses on this - I appreciate them

Tony

--

Tony Roberts
PP-ASEL
VFR OTT
Night
Cessna 172H C-GICE



In article ,
"Matt Barrow" wrote:

"Dan Luke" wrote in message
...

"CriticalMass" wrote:
I don't understand why you would want to operate the engine without
leaning. No recommendation I've ever read about post-overhaul break-in
ever included anything like that.

Well, you do want to run the engine at high power settings to seat the
rings
and you don't want to get the cylinders too hot lest they glaze, so
running
rich for break-in is a pretty common precaution against the latter.

Um...leaner is cooler, Dan! 50 LOP is about a hot as you can get an engine
without milting it down into slag.




--

Tony Roberts
PP-ASEL
VFR OTT
Night
Cessna 172H C-GICE