May be the twin-turbo version in the 13B engine designed to electrical power the 3rd-era RX-seven introduced in late 1991. Every single rotor on 13B-REW has a single combustion chamber volume of 654cc. With two rotors, the whole displacement was 1308cc. Great suit for just a Mazda swap or substitute https://josueklnid.howeweb.com/30350920/an-unbiased-view-of-rx7-13b-motor-for-sale