REFLECTOR: Thermal exhaust Wrap

[Jim & Sharon Beck]

I had Jet Hot do my exhaust for a IO360 and they did not coat the outside 
surface of the inner pipe in the slip joint and everything fit just fine.
They did make a mistake and coated in the Sterling silver instead of the 
extreme as I requested. They told me about it before shipping and
said that it should hold up just fine. It started flaking off in about 10 
hours and they will redo them for me but that requires some down time to 
ship back and redo. I would suggest the higher temp coating rather than the 
standard.
Jim Beck
173 RG 29RP
----- Original Message ----- 
From: "Bob Jackson" <bobj at computer.org>
To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
Sent: Tuesday, October 09, 2007 9:52 PM
Subject: Re: REFLECTOR: Thermal exhaust Wrap


>
>
> We considered ceramic coating the insides of our exhaust pipes, but got 
> hung
> up on how to handle the areas around the slips joints.  We put slips in 
> our
> exhaust design near each cylinder outlet to improve pipe life.  A normal
> ceramic job coats the entire pipe and the reduced diameter of the inside 
> of
> the outer pipe prevents the inner pipe portion of the slip from fitting
> inside.
>
> It might be possible to tape off those parts of the slip joints so ceramic
> is not depositing there.  Did anyone else that ceramic coated their pipes
> have trouble with the slips?  How did you handle the ceramic coating 
> around
> the slips?
>
> Another advantage of ceramic coating (or wraps) on a turbo engine (like
> ours) is that it delivers more of the exhaust heat to the turbo, thereby
> improving turbo energy extraction.  We ended up not ceramic coating, but
> instead making loose-fitting circular shaped wraps with fiberfax type
> insulation (like is used behind the firewall sheeting) sandwiched between
> inner and outer layers of stainless foil (using rivets to hold the
> 'sandwich' together).  The wraps stand out from the exhaust pipes by about
> an inch all the way around.  Our SS foil is about twice as thick as
> household aluminum foil.  We have not yet flight tested our design yet.
>
> Bob Jackson
> Turbo Velocity XL
> N2XF
>
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of Alex Balic
> Sent: Tuesday, October 09, 2007 11:41 AM
> To: 'Velocity Aircraft Owners and Builders list'
> Subject: Re: REFLECTOR: Thermal exhaust Wrap
>
> I ceramic coated my exhaust before wrapping it- it still got blistering 
> hot
> even with the ceramic- I have used exhaust wrap on heavy equipment for 
> over
> 15 years- these vehicles have semi-exposed engines and exhaust systems 
> that
> get wet every time it rains- I have not noticed any degradation in any
> exhaust system as a result of the wrap. On my aircraft engine system, I 
> over
> wrapped the pipes with self sealing silicone tape in lieu of the silicone
> spray that they sell for the same purpose- do not have very much run time 
> on
> the system yet, but it all seems to be holding up well
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of Tom
> Sent: Tuesday, October 09, 2007 8:22 AM
> To: reflector at tvbf.org
> Subject: REFLECTOR: Thermal exhaust Wrap
>
> Ceramic coating is the long term way to go,( you can also coat the
> inside) The wrap will work but has two drawbacks:
> 1) It will greatly curtail the life of your exhaust system
> 2) you need to play with it every so often as it will start falling
> apart in spots
>
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