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To:  lml@lancaironline.net
Date: Fri, 10 Apr 2009 20:23:04 -0400
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From:  <toucan@satx.rr.com>
Subject: RE: Hot #2 on IO-550-N
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Thanks, Fred, I'll pass along the message and pictures.  They're very helpful, and I appreciate you taking the time to send them.

Jim Cameron

---- lml@lancaironline.net wrote: 
> Cylinder No. 2 is hard up against the entry air box for the oil cooler.  The
> air can not flow from top fins to bottom fins in this position.  The sheet
> metal at the front of the air box blocks air from passing around the
> cylinder from top to bottom on the back side of the cylinder.  On other
> cylinders, the flow can go over to the adjacent cylinder, and then back
> again.  It is a known problem.  
> 
> The solution is either to cut a window in the front of the oil cooler inlet
> box to air flow to the bottom of the no. 2 cylinder cooling fins
> (problematical with the oil door opening and closing) or to cut the window
> and put in a fibreglass blister in the front wall of the box to allow air to
> bypass the portion of the cylinder where the fin depth goes to zero. 
> 
> I have attached a photo of my oil cooler inlet air box with the blister
> installed.   To get oriented, note oil cooler door at top. 
> 
> Fred Moreno
> 
> -----Original Message-----
> From: Jim Cameron [mailto:toucan@Satx.rr.com] 
> Sent: Monday, 6 April 2009 7:41 PM
> To: lml@lancaironline.net
> Subject: 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
>