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Date: Thu, 09 Apr 2009 20:24:41 -0400
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From: <zoelt@sio.midco.net>
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Subject: RE: [LML] Re: Hot #2 on IO-550-N
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Snugly.
Charlie Kohler checked it.  The guys at RDD checked it when they  did their
sealing baffling process ($2000) that didn't help.
In my opinion we need to increase upper deck pressure (change cowl,naca
scoop, move intercoolers) or reduce lower deck pressure(open rear of lower
cowl, louver below #2 cylinder, cowl flaps).  I don't know, but I'll let you
know when OATs get warmer and my temps go up.
Tim

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of
Walter Atkinson
Sent: Thursday, April 09, 2009 6:53 AM
To: lml@lancaironline.net
Subject: [LML] Re: Hot #2 on IO-550-N

Does the aft lower baffle wrap snugly around the lower fat fins with  
the space above??

Walter


On Apr 8, 2009, at 9:52 AM, <zoelt@sio.midco.net>  
<zoelt@sio.midco.net> wrote:

Thanks Walter,
What if you've done that and the cylinder is still hot?  30 degrees, all
situations, airspeeds, climb and descent, all EGTs.  I've even  
shielded the
turbos on BOTH sides.
Is next step opening lower cowl? Spring is upon us and I fear I won't  
keep
#2 below 420 when weather gets warmer.
Thanks,
Tim

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of
Walter Atkinson
Sent: Tuesday, April 07, 2009 6:32 PM
To: lml@lancaironline.net
Subject: [LML] Re: Hot #2 on IO-550-N

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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