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I am about to have a set of exhaust
flanges laser cut for my 20B. I played with the shape and have one that a
1 7/8" OD pipe will fit without any significant stretching. I plan to use
the drop from the center as a form to shape the pipe so it will fit the hole
more easily. I'm guessing at this stuff, having never done it
before. I left myself .040" of circumference for slop. My welder
says he routinely stretches pipe to fit the flanges, but I wanted to play with
AutoCAD. I don't know if my exhaust ports match the 13b's, but I have some
geometry to play with here. I shoved clay in the port and measured from
the plug. The first set of 3 flanges cost $65 in 3/8" 304 S/S, so I am
expecting these to be the same price. I couldn't find a way to plot this
file to a PDF, so you'll have to use a freebie AutoCAD viewer to see it.
If anyone thinks they want a set I'll ask about having more cut.
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