Is that rust particles or carbon residue?

On Thu, Mar 1, 2018 at 7:42 PM, Sid Wood via KRnet <krnet@list.krnet.org>
wrote:

> I noticed rust particles on the hangar floor under the exhaust exits on
> the 2180 VW.  These exhaust pipes are 4130 steel and were ceramic coated
> inside and outside by Jet Hot.  The guaranty by Jet Hot was for life.  The
> outside of the ceramic coated pipes look exactly like when they were
> received from Jet Hot.  Not so for the rusty inside.
> The engine has not been run for 19 months.  The engine has 12.4 hours TT.
> I held a paper towel under the exhaust pipe outlet and tapped on the pipe
> with a plastic screw driver handle.  The picture shows what I collected in
> a few seconds.  Wonder how much life is left in my current exhaust pipes?
>
> https://s3.amazonaws.com/expercraft/sidwood/8726119685a98bf952327e.jpg
>
> Sid Wood
> Tri-gear KR-2 N6242
> California, MD, USA
>
>
>
>
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