Re: Good post

[bearbvd@domain.elided (Greg Hermann)]

>Greg,
>Good post. I like the specifics.
>John H.
>----------

Thanks John!

Just to finish it--the proper names for the appropriate high nickel iron
alloys for this kind of use are Ni-Resist and Meehanite CRS (which should
not be confused with Meehanite GA).

Regards, Greg
>
>The only reasonably available materials that will truly stand up to
>the EGT
>if you insulate an exhaust system are high nickel cast iron and 321 or
>347
>Stainless Steel. Even 304 or 316 stainless will NOT take it long
>term--they
>will crack from intergranular high temp induced stress corrosion. The
>best
>way to keep something near to the exhaust cooler is with a separate
>metal
>heat shield which has decent air flow on both sides of it--something
>like
>the heat shield which was used by the factory on the later Scouts. If
>you
>make the shield out of stainless, so much the better, since shiny on
>both
>sides is a BIG help in reducing radiative heat transfer.
>
>Regards, Greg