Could be the twin-turbo Variation of the 13B engine created to electrical power the third-technology RX-7 launched in late 1991. Every single rotor on 13B-REW has one combustion chamber volume of 654cc. With two rotors, the whole displacement was 1308cc. Best in shape for any Mazda swap or substitution job. https://alexissmoey.blogproducer.com/36211636/13b-turbo-engine-for-sale-for-dummies