akwrencher
Well-Known Member
I found this paper on two strokes that has a lot of useful info in it on designing tuned exhausts for different applications. It's old, from the seventies, and is quite lengthy, but worth a look. The expansion chamber section is a little less than halfway down.
Gordon Jennings Two-Stroke Tuner's Handbook | Two Stroke Engine Tuning
Gordon Jennings Two-Stroke Tuner's Handbook | Two Stroke Engine Tuning