On Jul 13, 9:09 pm, Scott wrote:

Actually, my muffs fit fairly "airtight" around the exhaust pipes. I
actually had to cut and trim a bit to make them fit at all, so I think
the majority of the heat produced is captured inside the muff. However,
I just don't think the two halves of aluminum have enough thermal mass
to provide a ton of heat to the carb, so I think I still need to come up
with a safe way to add mass inside the muff.

Scott

The Aeronca muff often involved a deflector plate, attached to a small
strut across the pipe vee, that prevented the air from travelling
straight across the chamber from the inlet to the outlet. The
deflector made the air flow around the pipes to get from one side to
the other. Lots more heat. Does your have that?

Dan