Here's some interesting read on calculating the runner length for rx7. Gets indept with lots of intake and exhaust math.

http://www.rx7club.com/general-rotary-tech-support-11/heres-how-figure-out-intake-runner-length-199788/

Back to planes, for the 2.85 psru gearing it looks like around 24" gives you the best HP from what I read on Pauls site. What about for Neil's upcoming psru and his 3.xx gearing, do we have a length to aim for? (I forget what the gear size is)

Right now I have 23 inches to play with. I'm just spending the day making a plenum box, not sure if we have a volume we are striving for.

- Matt Boiteau

Side ports. For the P-port I just copied the p-port le mans engine as closely as possible.
If you err on the long side the fuel burn will be slightly lower at cruise.

We need to do more research on Helmholtz resonators. I suspect they would save some
space under the cowl.

Paul Lamar

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