Re: Ceramic coating EM's

[Gerard <gerard@poboxes.com>]

> Regarding inside v outside.  I'm with Jeff G on this one,
> inside only.  Doing the outside can trap the heat in the manifold,
> increasing the heat cycle delta of an already prone-to-cracking
> manifold.

Okay. I've been thinking about it a bit and I think that if
I'm going to be getting a new piece like this then I should go
full out and do some extra coating. Some of it to help get rid
of any heat.

To finalise, would the following be a good plan:

	1) coat inside of EM with thermal barrier ceramic
	   coating. Lowers heat levels which the EM metal
	   is subjected to.

	2) leave outside of EM as is, no thermal barrier, allows
	   any heat passing the inner coating to be dissipated
	   as normal from the exhaust manifold.
	   -or-
	   coat outside of EM with a thermal dissipating coating,
	   helps disperse the heat passing into the manifold
	   metal. Also helps prevent surface oxidation and
	   scaling and looks pretty darn good (but I think it
	   might be in black only to act as a radiator)! :)
	   (something like http://www.brookscoatsit.com/dispersent.html)

	3) do same to turbo turbine housing. To me this would
	   mean also less heat transfer to EM from turbine.

	4) don't suppose the connecting pipes need a coating? :)

To me this dissipating coating I see on the coating websites
would be ideal to help get rid of any excess heat that
would be building up when the motor is switched off. While
running, the heat should be transferred off by air moving
through the engine bay.

I'm not thinking of other "performance" coatings to
things like the impeller housing, inlet pipe and
inlet manifold. Maybe later, but right now the investment
is towards the exhaust manifold. Most of these just
seem like they need a dissipating coating which will
most likely be black to help get rid of any heat
passing into the thing.

G.
Audi 200 1990 (motor and body only 9km apart!)