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Posted for Mark Steitle <msteitle@mail.utexas.edu>:
Kevin,
My design is very similar to yours except I used a 3/8" mating flange. The problem I encountered was how to do the welds where the intake runners meet with the flange. I ended up oversizing the holes and welding them from the inside. (Sorry, no pictures). After welding, I had the flange resurfaced.
Mark
Lancair ES-20B
here's what I have come up with so far. The tubes are just setting there, so a bit misaligned. There appears to be plenty of cowl clearance. I have the cowl positioned such that it will entirely cover Tracy's redrive (14 1/2") and the cowl will have to be augmented back on the firewall side. I plan to
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