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neat thread! i've not much to contribute except that i've read a lot of SAE papers and Mazda has published a lot of rotary specific info.
particularly 831010 which is the 6 port intake system. the 90032 rotary P port modeling paper. also the S2000 paper is good, although isn't rotary specific. there is an S5 paper too.
the crib notes, we know about the lengths, i think, shorter = higher rpm peak.
they have a graph of plenum size vs VE, and due to the 270 degree cycles the rotary has what they call a tournament effect, when one rotor closes it uses the reflection to charge the other rotor. Mazda found a smaller plenum increases this effect. honda actually found the same, which is why the S2000 has a teeny plenum.
with the Rx8, all the runners (primary, secondary, thirdinary, corollary, arbitrary, and fred), have tuned lengths AND diameters.
from the info provided it really looks like Mazda made something that they could easily change the lengths on, and then they just tried a bunch, easier to do on a P port.
mike
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