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if i'm mot mistaken, the explanation of the new rotary is already being published in Mazda site http://www.mazda.com/mazdaspirit/rotary/16x/

The current rotary engine in RX-8 is a 2 rotor RE (Rotary engine)1.3L a single rotor have 3 separate combustion chamber. so a 3 rotor RE have 9 combustion chamber!! capacity = 2.0L but power = 4....