<... a simple way to cut down on the amount of fuel/air mixture during idle ... yet have plenty of reserves at redline rpm ...>
So why do I need primarys and secondarys with different lengths that screw up DIE and generally make life more difficult?
There must be more to this than meets the eye ... Jim S.

echristley@nc.rr.com wrote:

 
> Could someone provide me with a quick and dirty explanation of
> why we have primary and secondary runners, and why we need them
> both for steady state operation?  Seems as if DIE would also be
> greatly simplified if there were only one runner per rotor.
>

Mazda used it as a simple way to cut down on the amount of fuel/air mixture during idle, and yet have plenty of reserves at redline rpm.