Looks like the same low torque design that plagues the rotary. But at least the rotary can rev - this thing would probably fly to pieces. I drove an RX7. The gas mileage was terrible and the heat loss was amazing. That's why I'm still a fan of the piston.

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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