REFLECTOR: ceramic coated exhaust pipes

[Jim & Sharon Beck]

I have not had good luck with the Jet hot coating sticking on used pipes. I 
have the standard 2 into 1 slip joint on my IO 360 Lycoming. The first 
coating peeled off in large chunks. I sent them back last spring for a redo, 
( which they charged me for since they had changed hands ) and now the 
second coating is coming off also.  Don't know what could be wrong as they 
did all the prep work.  these went to the AZ  plant.  Also for fire warning 
I have used the aux channel on my EE fuel flow gauge to mount a temp probe 
in the engine compartment . Normal temps run about 170 there so I set the 
alarm for 200 .
 Don't know what the temps ran before coating the pipes.

Jim

----- Original Message ----- 
From: "Brian Michalk" <michalk at awpi.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Monday, November 03, 2008 7:52 AM
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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