Gary Wolf wrote:

Mike,
   I have tried the water pressure method of forming 2-stroke chambers and
recommend it for large diameter cross-sections. In the head-pipe diameters
it is less successful, at least it was for me. The difficulty arises in
getting it to form round before the weld springs a leak.

   If you are making horn shapes, where the cross-section is always
expanding, the results are good. On an expansion chamber, there is always a
large pucker where the horn converges to become the parallel section.

   The curvature of the part ends up being nowhere near the pattern shape.
You will have to try a few to get the degree of bend and radius correct.

                                                                Gary Wolf

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