REFLECTOR: ceramic coated exhaust pipes

[Brian Michalk]

I got some vibratory media used for cleaning parts in a vibrating 
container.  Partially filled the manifolds, and taped them closed.  Then 
chucked them in the lathe set at the slowest speed possible and tumbled 
each one for a few days.

Alex Balic wrote:
> Part of the prep for the coating process is bead blasting- so unless the old
> pipes are damaged, they should be fine to coat.
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of Scott Derrick
> Sent: Monday, November 03, 2008 8:45 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: ceramic coated exhaust pipes
>
> Yeah, there must be something to this.  I searched for info that was 
> negative about ceramic coating and couldn't find anything, other than it 
> not sticking.
>
> I wonder how well it would stick in used pipes.  I'd hate to have it 
> slough off and run through my turbo..
>
> Scott
>
> Tom wrote:
>   
>> Al, there are some advantages, particularly for those with updraft 
>> cooling. You're correct about the outside coating not doing much. A 
>> good, inside coating is needed which only a few places do well. I've got 
>> the short stacks from Velocity and since they slip apart, they were able 
>> to get a good coat on the inside.( Jet-Hot) I did gain over 100 static 
>> rpm after install but I believe that was mostly due to the exhaust 
>> system change. It's definitely cooler under the cowling, cooler CHTs and 
>> less risk of heat damage on tightly closed cowlings. I can hold my hand 
>> on the exhaust shortly after shutdown.
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