Wankel rotors of 13B The 13B may be the most widely generated rotary engine. It was the basis for all future Mazda Wankel engines, and was generated for more than thirty years. The 13B has no relation for the 13A. As a substitute, It is just a lengthened version with the 12A, obtaining eighty mm (3.In 1974, a brand new method was accustomed to har