Sure Steve: With your 415C, I assume you have the C-75. If so theres not
much you can do on the leaning thing, but I'll get to that presently. Dry
starts refers to normal petroleum based oils that do not adhere to your
engine parts , (bearings and such) and after shut down, drains off. This
causes the engine to start without proper lubrication on critical parts
such
as bearings and valve trains. And historically and NOT arguably causes
80%
of frictional wear in ANY engine. If however, as in the case of Amsoil and
some other "synthetic" oils, they contain a substance called "molly"
(Molybdenum disulfide") {I might even have spelled that right}, then the
oil
will adhere to those critical parts, eliminating those "dry starts".
Also,
most synthetics contain chemicals that absorb moisture. Between the
moisture absorption and adherence of oil to the parts, at least with
Amsoil,
you can store your engine up to a year without any activity, or
"pickling",
or fear of sulfuric acidic corrosion to your bearings. Now that I've
successfully confused both of us, I'll try some more. <Grin>
Proper leaning and Shut down procedure.-- You probably have a lean
"control", but it's not very effective. Continental wants you to run your
engine at "full rich", and rightfully so. If you're flying say at 7500'
however, you may want to lean a little, to maintain power. The proper
procedure, is to lean till you achieve max rpm's, then back off till you
see
a slight decrease in rpm level. This gives you a compromise between max
power and efficient cylinder cooling, keeping your CHT within acceptable
limits. I wouldn't worry about your EGT, because if your CHT is right,
the
EGT will be too.
Shut Down---- Procedure generally varies by Mfgr, but generally, you
should
keep your idle and Taxiing rpm's at or slightly above 1000, 1200 would be
best, mixture "full rich". When at shut down point, run rpm's to 15-1700
for 20-30 seconds, then reduce throttle to 1000 for a few seconds, and
shut
down by pulling "full lean". In your case, pull "full lean" and "switch
off", at the same time.
I hope I haven't confused you too much. I would print it out and digest it
till you understand it. These suggestions come right out of the
Continental
and Lycoming procedure statements, and to are to my knowledge, accurate.
Fly happy,
Doug
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