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Subject: LOP operation
Date: Thu, 27 Dec 2001 10:20:03 -0800
Message-ID: <D32786B4C9CB8C4AB70680F761506575030EA6@dewey.Cadwell.cadwell.com>
Thread-Topic: LOP operation
Thread-Index: AcGPA2c/IxYCwj82RiOGMZlN1cHnOw==
From: "Carl Cadwell" <CarlC@Cadwell.com>
To: <lancair.list@olsusa.com>
Reply-To: lancair.list@olsusa.com

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My Understanding:  In extensive discussions with Orin and the folks at
TCM, LOP operation should only be used when operating the TSIO-550-E at
or below 65% power.  To do it at higher power settings is going to
significantly shorten the life of the engine.  If you are going to run
at higher power settings, the fuel flow needs to be set to yield
readings of 50-75 degrees ROP.  The greatest danger zone is 50 degrees
ROP to peak.

It is my conclusion from reading and discussing this with the GAMI
folks, that they claim there is no shortening of the life of the engine
to run the engine at higher power settings lean of peak as long as you
are using their injectors.  TCM does not agree and TCM has to warranty
the early cylinder failures. =20

Performing the power vs. temperature curve on the E model in my plane
shows very little variance in the peak temperatures across the
cylinders.  So in my opinion, very little would be gained in using GAMI
injectors.

So currently I am running 75 degrees lean of peak at cruise.  I am using
2400 rpm and 29" manifold pressure.  I burn 15.5 gph.  With 90 gallons
of fuel I can fly 4 hours with 25 gallons of fuel remaining.  My TAS
speeds at various altitudes are:=20
9000	 	209 kts
	18000	234 kts=09
	21000	246 kts=09
	25000	264 kts
I used the following site for the calculations flying 3 cardinal
directions and recording the GPS groundspeed.
http://www.reacomp.com/true_airspeed/index.html=09

My TIT is typically 1510-1540.  The hottest cylinder is #5 at 310.  I
adjust the oil door to keep the oil at 170.

In climb, I use full rich, 30" and 2500 rpm and see 1200-1400 fpm.
Hottest cylinder #5 is 370-380

And it runs very smoothly, even smoother now with my MT prop dynamically
balanced.
I also add 4 oz. of Marvel's Mystery Oil per 10 gallons.
I make certain my oil temperature is 30 degrees or warmer before any
start.

My disclaimer:  I am just a guy out in the sticks of Eastern Washington
still trying to figure out life and having fun.

Carl Cadwell =20
N25CL, IVP 120 hours
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Please send your photos and drawings to marvkaye@olsusa.com.
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