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Ceramic exhaust coating

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Rick S.

Joined: 12 Feb 2006
Posts: 347
Location: Las Vegas

Posted: Fri Dec 22, 2006 10:53 am Post subject: Ceramic exhaust coating

Anybody want to chime in on the plus and minus of having the exhaust coated?



Rick S.

40185

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Rick S.
RV-10
40185

Deems Davis

Joined: 09 Jan 2006
Posts: 925

Posted: Fri Dec 22, 2006 5:25 pm Post subject: Ceramic exhaust coating

Plus: lower temperature inside of cowl from exhaust radiation. Better 

for fiberglass cowls.

Minus: Harder to pull heat off for heat muff,



Debatable:

Life of the exhaust system, I've had reports of it both shortening and 

lengthening the life of the exhaust.



If you coat the inside of the exhaust (as well as the outside), one 

member from my EAA chapter reported that his EGT temps rose aprox 100 

Degrees.



Deems Davis # 406

Finishing - ( A Misnomer ! )

http://deemsrv10.com/



Rick wrote:



 	  Quote: 	
		  



Anybody want to chime in on the plus and minus of having the exhaust coated?

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Rick S.

Joined: 12 Feb 2006
Posts: 347
Location: Las Vegas

Posted: Fri Dec 22, 2006 6:57 pm Post subject: Ceramic exhaust coating

Sooooooo, Are you going that way Deems?, I think just for looks the exhaust would look good in the Sterling or Jet black colors....I've been looking at Jetglo company.



Rick S.

40185



do not archive

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Rick S.
RV-10
40185

AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Fri Dec 22, 2006 7:44 pm Post subject: Ceramic exhaust coating

The color selected should be conducive to locating future cracks. Black

- though clearly neat looking, might just mask early detection.  No

reference that they will ever develop, just a perspective. Hit the

"delete" key and have a great Christmas.



With the addition of a turbo, there is a risk to ceramic coatings

flaking off and eating impellers.  The subject of coating flakes has not

been addressed in detail on this list. It has been extensive on the

Lancair site.



I personally love the color selection on Scott's (silver) N104XP but

believe it is externally coated only.  The use of coatings, then delays

temperature transfer which leads to 'potential' EGT sensor increase and

certainly would explain increased temps at the discharge point (which

then can affect transfer through the legendary skin and ultimately to

your feet).  One of the major benefits is significantly reduced temps in

the lower (low pressure) cowl. A side  benefit is less convective

transfer through the firewall. Increased scavenging of combustion heat

at the cylinder fins as a result of lower cowl temp reduction, ....

"This is a good thing". Longer life means money in your pocket.



Thermal cycling has far more of a negative impact than dueling over

coatings towards the safety issue of cracks. Scott has some great

'covered' foam induction plugs to stave off cold Utah winds after

shutdown but we haven't gone there either.  Some cracks propagate at the

attachment points from vibration, other are thermally induced.  Know

where to look... Fly Safe, Fly Often. Fly with CO monitoring.

http://www.myrv10.com/N104CD/upgrades/20061120/index.html



John Cox

the Turbanator #40600



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rvbuilder(at)sausen.net
Guest

Posted: Fri Dec 22, 2006 7:44 pm Post subject: Ceramic exhaust coating

Check the archives, this has been discussed a couple times.  Another advantage in keeping the heat in the exhaust is that it helps to keep the exhaust velocity up which aides in scavenging.  I'm still planning on doing it.



Michael



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Deems Davis

Joined: 09 Jan 2006
Posts: 925

Posted: Fri Dec 22, 2006 8:30 pm Post subject: Ceramic exhaust coating

I've ordered a tuned exhaust system from John Forsling, and he ceramic 

coats both the inside and the outside, The color is the same as the one 

on the lancair in this picture : 

http://deemsrv10.com/album/OSHKOSH%202006/slides/DSC03071.html   . The 

picture isn't really that good relative to the color, and I don't recall 

the name, but it's kinds a cross between a pewter and a light charcoal. 

they should be here in a couple of weeks and I'll take and post more 

pictures.



Deems Davis # 406

Finishing - ( A Misnomer ! )

http://deemsrv10.com/



Rick wrote:



 	  Quote: 	
		  



Sooooooo, Are you going that way Deems?, I think just for looks the exhaust would look good in the Sterling or Jet black colors....I've been looking at Jetglo company.



Rick S.

40185



do not archive

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sschmidt(at)ussynthetic.c
Guest

Posted: Fri Dec 22, 2006 10:24 pm Post subject: Ceramic exhaust coating

Your right John, it was only externally coated on my exhaust. 



Scott Schmidt

sschmidt(at)ussynthetic.com



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