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It's the way the air does NOT curl under the lower aft part of the cylinder. It has nothing to do with the oil cooler. The reason is the flat part of the aft section of the cylinder head has little to no fin depth. No air gets past this area to go to the lower fins. Add space between the aft part of the cylinder head and the metal baffle. About 3/8 inch seems to be optimal. This usually fixes it and makes #2 no longer the hottest CHT.
Walter Atkinson
Advanced Pilot Seminars
On Apr 6, 2009, at 11:22 AM, Art Bertolina wrote:
Jim
I put Zetex on the baffeling behind the exhaust pipes. I don't know how much that has helped because it has
been there from hour 1. #2 and #1 are my hottest
cylinders but still are just under 300 in cruise at 17.6gph
LOP
Art
----- Original Message ----- From: "Jim Cameron" <toucan@Satx.rr.com>
To: <lml@lancaironline.net>
Sent: Monday, April 06, 2009 4:41 AM
Subject: [LML] Hot #2 on IO-550-N
Friend of mine is scratching his head over his #2 cylinder on an IO-550-N. Runs about 40 degrees hotter than the rest, although all his EGT's are nearly the same. He spoke to a retired Continental engineer, who told him that a lot of the IO-550's had that problem. My friend has checked all the obvious, baffling leaks, shrouds fitting properly, etc. He tried putting the oil cooler door on and closing it part way, thinking maybe that would push more air over the cylinder. No dice. The problem seems to be not enough air flowing down between #2 and #4 -- that's the exhaust side of #2.
Has anyone else run into this? Any ideas how to push more air through there?
Jim Cameron
Legacy N132X
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