May be the twin-turbo version of the 13B engine created to energy the 3rd-generation RX-7 introduced in late 1991. Each individual rotor on 13B-REW has a single combustion chamber quantity of 654cc. With two rotors, the overall displacement was 1308cc. Great in good shape to get a Mazda swap or https://marcoqemjm.webbuzzfeed.com/31416254/new-step-by-step-map-for-13b-rotary-engine-for-sale