Mailing List lml@lancaironline.net Message #5644
From: J. N. Cameron <toucan@The-I.net>
Subject: Leaning the IO-550-G2B in the ES
Date: Sun, 28 May 2000 15:52:29 -0500
To: Lancair List <lancair.list@olsusa.com>
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    Well, 100 degrees lean of peak sounds like a bit much, but I did run
mine about 50 lean of peak for economy cruise.  All the CHT's were good, the
oil temp stayed cool, the engine was smooth, and the plugs were just the
right color when inspected at about 80 hours.  The difference between 50
lean and 50 rich was about 2.5 gph in mine (12 vs 14.5), so I was saving
almost 20% on fuel with only about an 8 knot speed penalty.  If the CHT's,
EGT's, and oil temps all stay in the good green, I don't see a problem.  The
whole point of the re-worked intake manifold was to even out fuel/air
distribution so the engine could run lean.  Worked for me.



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