John,



#2 was also my hottest cylinder.  First I installed the concave insert that
was listed in one of the on-line articles that allows the air to flow around
the shallow fins on the oil cooler side of #2 (is that what you are calling
the “hat box”?).  However, even with the concave insert, #2 was still my
hottest.  At that point I remembered that my engine, which I got from a
salvage of Adam aircraft inventory, came with a piece of baffling for the
oil box that had a scoop installed inside the oil box that directed air
around to the lower right side of the cylinder.  The scoop was ¾” deep at
the top and flush at the bottom, and about 3” wide (the width of the long
fins on the cylinder).  I moved this scoop from the discarded Adam baffling
piece onto the Lancair oil box (the hole was nearly the same size as the
previous concave shaped part I had installed before).  Not only did this
solve my #2 CHT problem (it is now one of my coolest cylinders), but it did
not noticeably affect oil temps.  A win-win.



Pete



From: John Barrett [mailto:jbarrett@carbinge.com]
Sent: Saturday, May 26, 2012 12:35 PM
To: lml@lancaironline.net
Subject: hot #2 Cyl TSIO 550 revisit



Hello all,



In April I asked some questions about this issue of  managing the cooling
flow for #2 cylinder and there was a prolific and enlightening response that
helped a lot.  The most common piece of advice was to build what was termed
a “hat box” in the forward wall of the oil cooler box to allow more air
around the back and bottom of this cylinder.



Someone posted a photo of that fix and it was excellent.  Now I’m ready to
go to work on this project and I’ve searched my data bases in different
computers for that photo for a couple of hours to no avail.  I’m hoping that
whoever was kind enough to post that picture will resend.



Thanks in advance.



Regards,



John Barrett, CEO

Leading Edge Composites

PO Box 428

Port Hadlock, WA 98339



www.carbinge.com