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The idea of rotary valves has been around almost 100 years I think, but its always had unsolvable lubrication problems. I'm skeptical that Coates has fixed this.
I'm also doubtful of the examples. I've never seen any 3rd party verification of their claims. This article talks about revving a 5L engine to almost 15,000 rpm - that's ridiculous. The engine would self-destruct. Flame propagation would also be iffy at the speed no matter what the valvetrain is. F1 engines rev that high, but I doubt these guys made something like that just to show off their system.
If it is true, then that explains why there's no dyno numbers on that engine. They just revved it until it blew...
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