Hi Angus
While I can offer no first hand experience, I am aware of relatively
fast pipe degradation with all 3 common types of steel exhaust tubing
when wrapped with heat tape. And of course once it is wrapped you likely
won't see any problems before they become severe. Road driven
"performance" vehicles do not run their exhaust systems anywhere near as
hot as your airplane for extended periods of time. Those cars and short
duration race vehicles with budget restrictions probably get away with
wrapping.
In a similar vein I'm not sure if a ceramic coating on only the exterior
of plain steel or 304 stainless is a great idea. At least you would be
able to inspect the pipes frequently but why make those metals even
hotter? If you are going to have someone else do it, I'd want the
interior treatment. I have heard it claimed that if you are only going
to coat the exterior anyway, some of the do it yourself coatings work
fairly well so I wouldn't hesitate to try one of those on 321 stainless.
For 304 stainless some claim it is a good idea to avoid exterior only
treatments closer than about a foot to the exhaust port. I don't know if
that really matters but that section of pipe can indeed run hot enough
to start degrading 304 over time according to what I've read. No problem
at all if the interior has also been treated of course.
Even untreated stainless pipes will be better than plain steel for
keeping heat out of the cowling of course.
Let us know what you decide.
Ken
Angus McKenzie wrote:
I am having a new 2" stainless exhaust built locally (0-320-A2B with
high oil temps and going on amphibs) and have been looking for a company
in the SW Ont. to coat it for me.While searching for a shop to do this I
have been in a local shop that does performance work for the formula
race car market.They recomended wrapping the exhaust with heat tape
(about $1.p/ft) as a more efficient solution from the coatings they have
seen applied to headers in their market.Then I spoke to a local business
that sells to the N/CASCAR market and they said stay away from tape and
cer-coat the headers inside and out.They said Morton Coatings in London
do their V-8 headers for around $400. Any comments, anyone?
...................Angus
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