George Lendich wrote:

Here is how to relate piston engine tuning to rotary
engine tuning. Basically the equivalent rotary port timing
to a piston engine is the rotary opens its port roughly half as
often so the runner length is roughly twice as long.

Paul,
So that helps to prove the length of the runner using the info off the web
i.e. 79,200 divided by 7,500 ( RPM) = 10.56 " (x 2) = 21.12"
OR tuned for cruise 79,200 divided by 6,000 =  13.2 ( x2) = 26.4"
Do you agree with this rule of thumb exercise?
George (down under)

No I don't.

The problems with that is it does not take into consideration the
diameter of the pipe. Just go with what Mazda discovered on the Lemans
engine. Unless of course you are willing to build 9 combinations
of pipe length and diameter and test them on a dyno.

Paul Lamar
 
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