May be the twin-turbo Variation on the 13B engine created to power the 3rd-generation RX-7 released in late 1991. Every single rotor on 13B-REW has one combustion chamber volume of 654cc. With two rotors, the overall displacement was 1308cc. Excellent in good shape for the Mazda swap or replacement task. https://rotary13b93579.blogpixi.com/39208620/the-best-side-of-rotary-engine-rx7