As the exhaust gas  moves away from the exhaust port, it must be
cooling.   Is this significant enough to utilize in our designs.
For example,  if the muffler is  twenty inches downstream instead of
two inches,  is it a lot cooler or just barely cooler?         Jerry

That was what I thought, and the answer is NO!
(that caused me an oil fire and having to re-skin the bottom of my airplane -
had routed oil line close - 1" - to the exhaust pipe - after muffler - and the
radiated heat burned a pinhole in the high pressure oil line).

Finn

 
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