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Subject: Re: [LML] GAMI lean test IO550N
From: Colyn Case <colyncase@earthlink.net>
In-Reply-To: <list-6575229@logan.com>
Date: Mon, 4 Nov 2013 07:10:10 -0500
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References: <list-6575229@logan.com>
To: "Lancair Mailing List" <lml@lancaironline.net>

Paul,   I take it your engine monitor rounds to the nearest 5 dF on =
EGT's?
If so, it makes it a little harder to tell exactly where the peaks are.  =
 You could have a .9 gph spread or a .5 gph spread depending.=20

You might get a little better data if now that you know the range of =
interest you step through in FF increments of .1 gph from 14.6 to 13.7 =
(stepping through more coarsely from the ROP side to make sure you don't =
miss the first peak)

Colyn

On Nov 3, 2013, at 4:47 PM, Paul Miller wrote:

 I haven't run a lean test on this IO550N before.  I've never removed =
the injectors in 768 hours.

On my way from Calgary to central Florida (one stop in Omaha, never done =
that before) I ran the lean test with the following basic results.  I'm =
interested in any feedback from this graph. I ran this test at 9500 feet =
and by the end the test was getting about 230TAS and all CHTs below 300 =
LOP.   I had good tailwinds so I was grounding 270K and flew Calgary to =
Omaha on 51G of avgas at 13,500.  As usual, I did that entire trip VFR =
with great help all the way from controllers.<Screen Shot 2013-11-03 at =
10.37.00 AM.png>
Paul
Legacy RG

PS: Over the Atlanta arrival route I was asked to remain at 13,500 until =
clear.  I encountered the top of a misty mountain for about 15 seconds.  =
 The windshield had some light crystals which disappeared immediately.  =
The wing leading edge had 1/16 inch of very light rime (I could see the =
line down through the landing light cover) like a white pencil lead =
laying spanwise along the leading edge.  You could barely see it.   I'm =
sure the prop had something similar.  I lost 20-25 knots in a heartbeat =
and never got it back for half an hour.  It was -6C.