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Are you running Your Engine 50F Rich of Peak below 8,000'?
Sorry, but that is so old school and quite wasteful actually.
Guess what?
Congratulations,
your engine is in the
Red Box!
Here is the TCM
procedure for Cylinder Compression and Borescope Evaluation:
TCM SB03-3
because you're going to need to be intimately
familiar with this procedure if you persist in operating your engine at 50F Rich
of Peak (the highest pressure and hottest cylinder operating zone).
Hey, don't take my word
for it, read
Mike Busch and
John Deakin's
engine columns and look at their DATA.
CSOBs hate to break or abuse expensive components so you'll find me operating my
IO470Ls on the
Lean and
"Green of
Peak" side, now >750 hours and all is well with my engines and my oil stays
golden brown into the 40 hour zone. Of course if your oil stays a golden brown
color instead of being pitch black, that must mean that it is not being
contaminated by fuel, combustion blow by the rings or mega heat from the high
combustion pressures.
Baron Owner and IA Stuart S. offers the
following simplified explanation of LOP operations:
"The combustion event begins with the spark
and the peak pressure occurs milliseconds later. LOP adds a bit of time to the
event. The higher the RPM, the further past TDC that the peak internal
combustion pressure occurs (ICP), resulting in less CHT."
This is another good reason to climb to your
cruise altitude at maximum continuous RPM!
Hey, but what the heck do I know about such
things???
Read Mike Busch's
#59 Article on Leaning
Or, check out this
LOP PowerPoint Presentation for a
good grounding in why this is the most efficient and effective operating
technique for your air cooled horizontally opposed aircraft engine.
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Running 50F Rich of Peak? (Please Don't!)