Wankel rotors of 13B The 13B could be the most widely developed rotary engine. It absolutely was the basis for all long run Mazda Wankel engines, and was manufactured for more than 30 years. The 13B has no relation on the 13A. In its place, It's a lengthened Variation of the 12A, obtaining 80 mm (3.My initially time obtaining a used JDM Mazda RX-s