"First things first. the new renesis engine in the rx8 is a 2.6L. the older versions of the 13b were 2.6L to. the 12A in the 1st gen rx7 was a 2.3L and the three-rotor 20b is a monstrous 3.9l. if you've been told a 13b was 1.3l, you've been lied to.

"on a four stroke there's only one intake stroke for every two revolutions, so from a breathing standpoint, displacement is how much combustion chamber volume gets sucked in over two revolutions. for a rotary, with one intake stroke per revolution, that means measuring two combustion chambers per rotor, not one, like mazda says. each chamber in a 13b displaces 654cc, so by mazda's two-stroke method, a 13b is 1308cc. by my four stroke, its a 2616cc"