I've heard about some TWO CYCLE small engines also running 22,000 rpm. Coincidence or fuel burn rate limitation?
What is the max rpm anyone else has heard of with two cycle?
Rotary engine?
Sure would like a picture of how those pneumatic valves actuate. What type of "air" do they use? How is the "air charge" for the valves maintained/recharged during a race? PSI?
...and Ken, it's OK to tell US what the "unobtainium" is, our lips are sealed.