REFLECTOR: Repairs exhaust Coting

[Mark Magee]

I believe the ceramic coatings are to be applied inside the exhaust manifold. This keeps more heat moving downstream, and doesn't stress the metallic structure by keeping the heat in the metal. Internal ceramic coating is the preferred method vs all others, even vs external wrapping. All external insulators will cause excessive heat build up on any welds on the manifold and could crystallize them over time, leading to failure. 
I once ceramic coated the exhaust manifold on a Cummins 8.3 and Jet Hot gave very easy instructions how to do it right: yes you can do a used manifold. Just tape off all the ports save one and pour diluted sulfuric acid into the manifold (obviously off the engine). Leave it in there a while to etch the metal and the pour it out. Rinse with fresh water and then dry, I think I hit mine with a blow gun. Re-tape the ports save one, mix the Jet Hot and pour it in. Rotate to coat and let dry. It can be cured in an oven or by running the engine.
Not that difficult. Racers of all variety are internally ceramic coating almost everything downstream from the head: exhaust manifold, inside of turbo housing, turbine blades and all exhaust piping all the way to the outlet.
Keeps the heat flowing more efficiently, protects the exhaust system and turbo and reportedly gets much faster turbo spool up.

Mark B. Magee
N34XL
Sent from IPhone 4S

On Sep 25, 2012, at 8:29 AM, "Grover McNair" <grover at mcnairperformance.com> wrote:

> The coating is applied to the outside after thorough cleaning, usually by bead blasting.
> Grover McNair
>  
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Ron N VelocityXLFG
> Sent: Tuesday, September 25, 2012 8:51 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Repairs exhaust Coting
>  
> Is the coating appied to the inside or out side of the exhaust.
> can it be appied to a used exhaust?
> 
> Ron
> On 9/23/2012 10:36 AM, Alex Balic wrote:
>> I agree- I ceramic coated mine, and it helps keep the heat from radiating- the coating I had applied looks like polished SS.
>>  
>> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Douglas Holub
>> Sent: Sunday, September 23, 2012 8:46 AM
>> To: Velocity Aircraft Owners and Builders list
>> Subject: Re: REFLECTOR: Repairs
>>  
>> One other thing I did to keep my exhaust pipes cool was to have them ceramic coated.
>> ----- Original Message -----
>> From: Lou Stedman
>> To: Velocity Reflector
>> Sent: Sunday, September 23, 2012 8:58 AM
>> Subject: REFLECTOR: Repairs
>>  
>> Thanks to all who replied to my repair question on exhaust. After reading your suggestions, I decided to cut an inch off my cowl extensions, exposing about 1/4” of my pipe. At the same time I enlarged the hole so I have better clearance. Hope this does the trick. I’ll will keep you informed.
>>  
>> No one responded to my rudder control horn repair question. Does that mean I am the only one who has had to do this repair? Since I didn’t build this plane, I don’t know what the control horn looks like inside the rudder. I am assuming it is just a straight piece of aluminum with a couple of holes to hold the epoxy. My plan is to use a hacksaw blade and try to remove the epoxy inside the rudder. Once I can remove the control horn, I’ll open up the hole a bit, fill it with epoxy and insert the control horn. Duct tape should hold in the proper position for curing. Any other suggestions are welcome. Thanks
>> Lou Stedman
>> Velocity SEFG
>> N7044Q
>> Olean, NY
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