Two-stroke expansion-chamber designer
Drawing shows the actual pipe only — Lcyl is not included. Angles are cone half-angles.
| Section | Small Ø | Large Ø | Length | Half-angle | Flat inner R | Flat outer R | Sweep |
|---|
Tailpipe / stinger. Tailpipe diameter is the minimum value it should be for its length to be unimportant — i.e. it can be however long you want it to be without affecting the pipe's performance.
Restrictor. The restrictor is right before the stinger and its diameter is a bit of an educated guess. If you select air-cooled you may want to make the restrictor adjustable and see what works best for you.
Cone development. The original site exported .con
files for the third-party Cone Layout
program. Since that format wasn't archived, the table above instead gives the flat-pattern
development directly: for each cone, mark two arcs at inner R and outer R
spanning the sweep angle, then roll. Straight sections roll from a rectangle
length × π·Ø.