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Bill,
I had a talk with Mistral a while back and the
chief engineer had some concerns with introducing fresh air into the exhaust (
for cooling) as it might initiate burning of residual fuel - hence more heat
rather than less heat.
That's why their cool tube (over the exhaust tube)
is discharged separate to the exhaust.
Although I intend to proceed with out original
design just to see the results.
Do you have any comments on this ?
George (down under)
Earnest,
I
believe that the SuperTrapp muffler is an example of a band gap device and it
worked well, if properly tuned.
I think the large block idea has merit too,
but you will have to allow enough thickness to prevent the tubes that see the
exhaust first to fight the harmonic vibration and heat. Different size
diamonds in the exhaust stream might also help fight harmonics.
Bill
Jepson
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