Wankel rotors of 13B The 13B would be the most widely made rotary engine. It was the basis for all future Mazda Wankel engines, and was generated for more than 30 yrs. The 13B has no relation on the 13A. Alternatively, This is a lengthened Edition from the 12A, having eighty mm (3.Probably the most well known 4-rotor engine from Mazda, the 26B, wa