Since the rotary is capable of running very lean it is apparently 
very important to have a good ignition system.
Here is a chart from Klause Savior's LSE forum at the Golden State 
flyin.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org