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Here's an interesting data point on the issue of ceramic coating of engine components. IIRC, this is a highly respected builder of Lyc aircraft engines with no motivation to make outlandish claims about this stuff.
Charlie
-------- Original Message --------
Subject: RE: RV-List: Re: Exhaust wrap
Date: Wed, 29 Jun 2005 14:26:14 -0500
From: BPA <BPA@bpaengines.com>
Reply-To: rv-list@matronics.com
To: <rv-list@matronics.com>
--> RV-List message posted by: "BPA" <BPA@BPAENGINES.COM>
Hi George,
I've been following this exhaust wrap debate all morning and decided I
would get a word in. Now, I am not an expert on exhaust systems, my
specialty lies in the building of high performance Lycoming engines
(certified also), but I have on more than one occasion eye witnessed two
different engines being tested on dynamometer using the ceramic coated
exhaust systems. One engine, a TSIO-520 running on a test cell at
another engine shop down from ours and a High Performance highly
modified IO-540 300 HP engine on our own dyno. On both occasions, the
mild steel pipes were ceramic coated inside and out. I could literally
hold my hand within 1 inch of the pipes before I could feel any radiant
heat from the pipes, and this was at full power. The shop responsible
for these systems is Forsling Aviation in Co. We are working on some
stuff for the RV-10 together, and doing some different testing with
different types of exhaust packages. If you would like to talk with
them, I would be more than happy to pass his number along. Regards,
Allen Barrett
Barrett Precision Engines, Inc.
www.barrettprecisionengines.com
(918) 835-1089 phone
-----Original Message-----
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of
gmcjetpilot@yahoo.com
To: rv-list@matronics.com
Subject: RV-List: Re: Exhaust wrap
--> RV-List message posted by: <gmcjetpilot@yahoo.com>
Here is the con of the Exhaust wrap as I understand it. I asked a two
manufactures of custom aircraft aircraft exhaust and was warned not to
use wrap. Apparently the exhaust pipe is put under more stress (thermal)
and leads to early failure. Also wrap can collect oil and cause a fire.
Apparently it is not an uncommon problem. Wrap at your own risk. I like
the idea, but if it increases the fire danger or chance of an exhaust
crack, I will pass for now.
The other scheme to reduce heat under the cowl is ceramic coatings. I
was told flat out buy one exhaust manufacture that he would not warranty
my exhaust with ceramic. Again more likely to crack.
It make sense. If you keep the exhaust super heated and unable to cool
it may fail earlier. As far as ceramics there may be a whole different
mechanism in causing cracks in exhaust pipes.Any technical data or
experience with wrap. I am only going on what the people who make
stainless steel exhaust say. Is thick walled mild steel better with
wraps or coatings?
Cheers George Time: 06:43:08 PM PST US From: "RV6 Flyer" <rv6_flyer@hotmail.com> Subject: exhaust wrap --> RV-List message posted by: "RV6 Flyer" <rv6_flyer@hotmail.com>
Been using the stuff Aircraft Spruce sells since about 50 hours.
I leave it natural in color. I have found that stainless steel hose clamps
work best. Have tried the strap bands sold for the job and safety wire. The
hose clamps do the best job.
I have never wrapped any wield or joint so that these items can be
inspected. When you wrap a join or get a break in the pipe, it
will BLOW through the wrap. I have never had a break in my pipe yet but know
on RV-3 with an OLD Toole (spelling) exhaust that did.
Gary A. Sobek
"My Sanity" RV-6 N157GS O-320 Hartzell,
1,690 + Flying Hours So. CA, USA
http://SoCAL_WVAF.rvproject.com
----Original Message Follows----
From: Louis Willig <larywil@comcast.net>
Subject: RV-List: exhaust wrap
--> RV-List message posted by: Louis Willig <larywil@comcast.net>
Hi gang,
I just removed the exhaust wrap that was applied by the builder of
my RV-4,
IO-360. After nearly 500 hours, the wrap had deteriorated and
could be torn
off by hand. I never liked the wrap because I always believed that
it might
be hiding underlying problems. BUT, now that it's been removed,
I realize
how effective it has been. Since there were no problems found
after
removal, I think I will replace it. So, does anyone have a
suggestion
concerning the best brand(s) to use and what color to use. All
suggestions
will be considered. Thanks.
Louis I Willig
1640 Oakwood Dr.
Penn Valley, PA 19072
610 668-4964
RV-4, N180PF
190HP IO-360, C/S prop
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