REFLECTOR: ceramic coated exhaust pipes

Brian Michalk michalk at awpi.com
Mon Nov 3 13:41:08 CST 2008


They came out with a matte finish.
Not flying yet, but no sign of problems yet with maybe six hours on them.

Alex Balic wrote:
> That is a great idea- as long as you can swing the part in the lathe- how
> did they turn out?
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of Brian Michalk
> Sent: Monday, November 03, 2008 9:52 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: ceramic coated exhaust pipes
>
> 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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