REFLECTOR: Exhaust/cowling

[Alex Balic]

Tom-
I got some ceramic fiber material from McMaster Carr- it is only about
1/16-1/8" thick- you might need to put some insulation directly against the
glass- then some sort of reflective shield in between that and the pipe
helps if you can get some air moving in there too

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Tom
Sent: Monday, December 24, 2007 2:49 PM
To: reflector at tvbf.org
Subject: REFLECTOR: Exhaust/cowling

Had a funky 4 into one exhaust (single crossover), mild steel with no 
slip joints. I knew that this wouldn't work for long and it let go just 
before I needed plane for Christmas travel to be with family (wife is 
pissed). Anyhow I called Velocity and was told the two pipe, 2 into one 
system should be an easy install (IO-360). Bolted up nice and easy but 
the cowling was hitting the pipes at the #1 cyl (left, rear). Cut a slot 
in lower cowl and added a blister with 1/2" clearance, wrapped the 
exhaust and test flew. After landing cowling was bubbling and smoking. 
Tried some insulation on a 2nd test flight but it was touching exhaust 
and had similar issues. 2 questions:
1) how much clearance do you need between exhaust pipe and cowl?--I'm 
working on a larger blister now
2) what's a good insulation material that's not too wide?? thx Tom
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