I don't agree that it will necessarily crack. In any case
no problem. Just put a large slip joint in the muffler itself.
I'll make a drawing soon.

BTW Dave Atkins has been flying with one made from thin Inconel for at

least 400 hours.

As I recall  it weighs four pounds less the flange.

Paul Lamar

Jeff Spitzer wrote:

The one you showed won't crack 'cause it uses the heavy one-piece racing
beat flange.  I'd guess that the one that failed (Finn's?) used separate
flanges.

Jeff Spitzer

Finn Lassen wrote:

Well, the reason mine cracked, I thought, was because the 2 to 3' long exhaust
pipe kept banging against the bottom of the fixed engine mount as the engine
vibrated in it's rubber mounts. The rear support bracket on the muffler had also
broken, supporting this theory. Someone on this list mentioned that the repeated
expansion-contraction of the thin muffler material between the two header pipes
would also contribute to cracking. Don't know if that's really true.

Finn

 
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