May be the twin-turbo Variation in the 13B engine created to energy the third-era RX-seven released in late 1991. Each and every rotor on 13B-REW has an individual combustion chamber volume of 654cc. With two rotors, the full displacement was 1308cc. Great fit for any Mazda swap or substitution project. https://13b-turbo-2-engine-for-sa48147.worldblogged.com/35658048/everything-about-rx7-motor