REFLECTOR: Thermal exhaust Wrap

[Brian Michalk]

I definitely had that problem.
Slip joints would not slip after the ceramic coating.
I think you could tell your coater not to coat the inside of the outside 
tube.

What I did was take a dremel to the inside and removed ceramic until 
they fit together.  It was not very difficult at all.

Bob Jackson wrote:
> 
> 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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