We have been here before (...I think), you want to know
everythig about LOP operation got to: http://www.gami.com
Also the following reading is a good primer on the
subject:
If not everything, at least the parts that concern
detonation can be applied directly to the rotary ( or to any engine for that
matter).
I didn't finish reading the turbo articles yet, but
through #2, they are very intersting! SO I just post the rest right away
too!
If you got that far you might just read on through all of
John Deakin's Pelican's Perch articles....
FOr me it will be LOP as often as possible, however please
note that it is pointed out, morwe than once, that you will need rather
precise indication equipment and well balanced injectors. How ever as most on
this list run Electronic engine controls, this is mostly basic equipment anyway.
Setting up the controller corectly for LOP is the challenge, .....I think
:)
Thomas Jakits
----- Original Message -----
Sent: Wednesday, May 04, 2005 5:04
PM
Subject: [FlyRotary] Re: EGT temps
David Carter wrote:
A point I like to think of is that 50 or 80
degrees "from" "peak" on the rich side and on the lean side is, the same
temperature. For piston engines, running 50 deg lean of peak is the
same temp as running 50 deg rich of peak, so the valves are seeing the same
temp - so why are some engine "gurus" so adament about cruising 50
deg rich of peak? It makes no sense to me.
So, I believe there is no such thing as "EGT
too high". There is only "peak EGT", whatever it is for your
installation.
David
If you look
at the lycoming temp/power graphics that seem to make their way around this
board, you will notice that while 50..(or 80) degrees rich OR lean of peak are
the same temperature, their effect is NOT the same. The Cylinder Head Temps in
the rich of peak equation have been documented to be hotter, and "best power"
occurs on the rich of peak side, not AT peak EGT or lean of peak. Now, we HAVE
water cooling to help attenuate the temps the block attains.. but the lesson
to be learned is that running on the rich of peak side results in more heat
generation which is more heat that must be dissipated.
The air
cooled guys dont/shouldnt climb lean of peak primarily to avoid detonation and
to use fuel for cooling. We probably could, but it helps to be aware of the
events at play.
Dave
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