Will be the twin-turbo version of the 13B engine designed to electrical power the third-technology RX-seven released in late 1991. Every rotor on 13B-REW has an individual combustion chamber volume of 654cc. With two rotors, the whole displacement was 1308cc. Excellent match to get a Mazda swap or replacement challenge. https://13brotarymotorforsale70000.blogdanica.com/30807799/built-13b-motor-for-sale-an-overview