Howdy shaggs,
Your not wrong about trying to understand expansion chambers
, i've been told its all about getting the "pulse" of the exhaust flow in balance with the back pressure.
Also same sought of thing with "tuned length" extractors on a car, each "pulse" of exhaust gas from each cylinder has to be perfectly in tune with the "pulse" of the cylinder before and the "pulse" of the cylinder after.
Pretty complicated stuff and far too hard to try and understand on a hot Adealide afternoon.
Regarding your saw,
is the pipe just welded to the cover, or is it inserted inside muffler somewhat?
have you done anything to the muffler internally?
with the decrease in heat did you notice a reduction in fuel consumption?
Cheers mate
