I realize that the carb is a little richer at full throttle, but I can lean
to a higher peak EGT at half throttle than I can at full throttle.

Brian Kraut
Engineering Alternatives, Inc.
www.engalt.com

-----Original Message-----
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
Behalf Of jscott.pi...@juno.com
Sent: Friday, November 25, 2005 7:03 PM
To: kr...@mylist.net
Subject: Re: KR> O-200 EGT



On Fri, 25 Nov 2005 09:15:54 -0600 "Mark Langford" <n5...@hiwaay.net>
writes:
>
> Brian Kraut wrote:
>
> I don't know Jack about 0-200 engines, but I do know that many (if  not
most)
> aircraft carbs are set up to enrich the mixture at full throttle  for
> detonation resistance during takeoff.  That's my guess.  It probably
depends
> on your exact carburetor more than anything else.
>
> Mark Langford, Huntsville, Alabama
> see KR2S project N56ML at http://home.hiwaay.net/~langford
> email to N56ML "at" hiwaay.net
> --------------------------------------------------------------

The stock Facet (Marvel Scheibler) MA-3SPA carb is set up to enrichen the
mixture at full throttle to augment cooling and, as Mark said, to help
prevent detonation.  The EGTs on my O-200 also drop at full throttle.
Since I fly high altitude all the time (including take off), I always
lean for best performance.  When I reduce from full throttle, the engine
will run a little bit rough until I enrichen the mixture a bit.

Jeff Scott
N1213W - Los Alamos, NM

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