16X
Also known as the Renesis (2), made its first and only appearance in the Mazda Taiki concept car at the 2007 Tokyo Auto Show, but has not been seen since. It featured a lengthened stroke, reduced width rotor housing, direct injection, and aluminum side housings. The 16X Renesis rotary engine is said to be capable of up to 300 hp.
Read more about this topic: Mazda Wankel Engine