Wankel rotors of 13B The 13B may be the most generally created rotary engine. It absolutely was The premise for all potential Mazda Wankel engines, and was made for over thirty years. The 13B has no relation towards the 13A. As an alternative, This is a lengthened Edition from the 12A, obtaining 80 mm (three.My 1st time buying a utilized JDM Mazda