Wankel rotors of 13B The 13B is definitely the most generally manufactured rotary engine. It absolutely was The premise for all long run Mazda Wankel engines, and was manufactured for more than 30 decades. The 13B has no relation to the 13A. Rather, It's really a lengthened Model with the 12A, possessing eighty mm (three.Dilemma: How much time is