This thing is a sealing nightmare. It has to be air-cooled since you can't put a water jacket around it. Just like a rotary, any little foreign matter that scars the inside of the donut will instantly trash the whole engine. Its a nice website and intrigueing design, but they don't show the bigger outer structure thats needed to hold those moving cams and levers in place. I don't think it will see the light of day.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma