Could be the twin-turbo Model in the 13B engine made to power the 3rd-generation RX-seven launched in late 1991. Each and every rotor on 13B-REW has a single combustion chamber quantity of 654cc. With two rotors, the entire displacement was 1308cc. Fantastic fit for any Mazda swap or substitute task. https://rotaryenginerx710818.digiblogbox.com/63263317/mazda-13b-motor-for-sale-fundamentals-explained