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I really do appreciate all the posts in
the last month or so on cooling and insight gained from Ada. However, I did find
it all a bit disjointed but was able to pull bits a pieces of info from all the
posts. This subject is very hard to verbalize, but I will try.
Cyl.# 1- Always has been very cool (170
C) ,so it is a non issue.
Cyl# 2-The hottest (200 to 210 C) in
cruise. I actually had to replace it at 850 hours due to it being "out of
round".From the List I learned that you have to drive the air down thru the
FRONT on # 2, at the flat spot, where there are very small to no cooling
fins. This was very easy to do by cutting 3/4" off of the 45 degrees ramp that
is actually touching the cylinder. This opened up a gap about 1/4" directly in
the front center of # 2. No air was going over the front lower quarter of # 2.
Now air is going over and under # 2. The result is a 10 to 15 degree C drop in
temp. The piece that I cut off has no structural value to the baffling and looks
like it was designed to force the air up into the plenum
area.
Cyl # 4- Always ran cool like # 1 ( I
need 4 ahead of 3 as a reference)
Cyl # 4 has a curved baffling
piece about 1/2" from the flat spot in the very rear of the engine
that allows air to be forced downward at the very place it needs the most air.Again, a
flat spot with very small if any cooling fins.
Cyl#3- Always hot like # 2. Looking at
the rear of # 3, you can see how the air cannot go through the top rear of
3 # (guess what, the flat spot).It should be a fairly simple matter to make the
rear of # 3 look like the rear of # 4 ( a curved piece that stands off from the
top rear of # 3)
I'm sorry that this is so wordy, but that
is the nature of conversation. Also, I really love my airplane, but feel that
Lancair let us down in the design of the baffling. I will report on the
progress of # 3 next week.
Sincerely, Fred N. Baron, Lancair 9BF
(Don't fly like my brother)
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