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From: George Braly <gwbraly@gami.com>
To: "'lancair.list@olsusa.com'" <lancair.list@olsusa.com>
Subject: RE: Efficiency: Auto engine versus aircraft
Date: Sun, 23 Dec 2001 02:08:12 -0600
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Reply-To: lancair.list@olsusa.com

          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>



>>As a result of this general trend of bad experience, the Lancair factory
came out with its own recommendation in their newsletter over a year
ago.  I would guess that the factory has burned more avgas in the
TSIO-550 that many of us combined, so their advice is worth listening
to.  Orin Riddell wrote that they now recommend operating well rich of
peak to get the engine lifetime a customer should be able to expect.
Here are the recommended figures from their newsletter:

100%, 350 HP, take off, Full rich 41-43 gallons per hour
75%, 262 HP, cruise climb, Full rich 27-28 gallons per hour
65%, 227 HP, economy cruise, 100F rich of peak 20-21 gallons per hour
55%, 192 HP, economy cruise, 100F rich of peak 16-17 12.5-13.5 gallons
per hour

Note that 75% power is no longer recommended as a cruise power setting,
except full rich during climb.<<

Those recommendations look like numbers somebody would publish if they
wanted everybody to buy a turbine engine!


I am simply stunned by this recommendation.

For example, I routinely operate my turbo-normalized IO-550 in my Bonanza at
260 to 270 Hp in cruise, at altitude.

My fuel burn is not 27-28 gph.  It is not 20 or 21 gph.  It is typically
18.0 gph.  With the tip tanks, it has typical range in excess of 1300 NM
with reserves.

The hottest CHT will be under 380F. 

If the TSIO-550 in the Lancair is not capable of operating lean of peak and
with CHTs nicely under 400F then, very simply, something is wrong with the
installation.  We now have STCs for the tuned fuel injectors to be installed
in the tuned induction system engines.  With only a few exceptions, these
engines will operate very smoothly and with cool CHTs lean of peak when
properly set up.

Regards,  George 
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
LML website:   http://members.olsusa.com/mkaye/maillist.html
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assist with the management of the LML.

Please send your photos and drawings to marvkaye@olsusa.com.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>