Hi, Paul.....I am almost finished with the wiring for my ECU on my
13B.
A few more other connections, and it should be ready to run it and
begin
 taxi testing. Hopefully within a couple of weeks?   My final obstacle
is the muffler.

I was looking at the inconel exhaust that Racing Beat
made, that is shown on your website, and a picture is also attached
to this e-mail.  I was wondering how well it might work if I were to
have one made similar to this one, with the exception that it would
be for a 2-rotor instead of a 3 rotor, and without provisions for a
turbo.

If I could have it made just terminating in a short, straight
pipe, I could then just attach stainless steel flexible pipe, and it
would be easy for me to try different mufflers, such as the Borla
and Burns Stainless ultra light muffler, etc.  Because it is a pusher,
I would like to have the pipes pointing toward the water pump instead
of toward the flywheel, and from there I could attach stainless flex
pipe in a 180 degree bend, then the muffler. That would fit within my
cowling pretty well.  Any idea how the expansion joints or whatever
they are on this picture were made?  I see that Burns Stainless has
inconel bends, but I don't have a source for the square inconel plates
that would mount to the engine exhaust ports. Possibly I could get
away with stainless if it were thick enough? Thanks for your opinions
and ideas. Hopefully, Ed Klepeis is monitoring.  Paul Conner

This man was big bucks. Something like $3000. I don't think you need
anything
quite that fancy. But you can call Jim Mederer at Racing Beat and ask
him
where he had it made.

There is a trade off between weight and cost. .049" thick
321 SS would work great. Do you have room for a VAM with a steel tube
running
forward to a supply of cold air? If that is not possible a simple
tangential
muffler would also work as long as the exhaust pipe was not aimed
directly
at the prop. If you go the square route 1/4 thick flanges would be
fine.
Paul Lamar

Don't forget that SS 253MA is available.  It will operate without
damage at 2000 degrees.  This is 300 degrees hotter than 321.    I
would build through the first bend with  .059 253MA and then switch to
a thinner 321 for the rest of the system.  Jerry

Steve Brooks wrote:

Another option is ceramic coating.  I had my 321 stainless exhaust coated
inside & out by JetHot.  Their 2000 coating is good (they say) to 2350
degrees.

Steve Brooks
Cozy MKIV 13BT

 
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