I've come to a dead end. Let me begin with the assumption that some people here are familiar with "tri-y" (a.k.a. 4-2-1) headers? I'm trying to figure out:
1. a reliable formula for determining pipe lengths, both absolute and proportionate (primary/secondary)
2. a reliable formula for determining relative diameter of secondaries (other than the "classic 20%" rule)
3. any reason why this should not work on 2 cylinder motors
Before you answer, yes, I've already read A. G. Bell and D. Vizard without finding an answer in either.
Any comments, links to good site, etc. most welcome as always.
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