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KISS primary tube volume / size
so to maximize exhaust scavenging at partial load / cruise
it looks like the primary tube volume should be about equal to the volume of 1 cylinder's displacement or a little more .
and the primary pipe diameter should be the size that allows the flow to be around 240 fps
( as per the formula s posted already )
AT the rpm that optimum efficiency is sought at
but this does not take into account the reduced VE that will be there at partial load ....
is this resolved in the value of "X" you said to ask about ?
and what about the collector ?
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