The ideal otto engine is something you may learn about in an introductory course of thermodynamics. It teaches important lessons about thermal efficiency, and it's the ultimate unachievable goal of every engineer who's ever worked on internal combustion development. But that certainly doesn't stop Mazda from trying. With their eyes set on the the ideal engine, they made changes from their SkyActiv-G engine to improve thermal efficiency in seven key areas. Most importantly, it's the world's first production implementation of compression ignition in a gasoline engine. More specifically, compression ignition timed with a spark plug: SPCCI. In this video we'll break down Mazda's SkyActiv-X engine, and talk about four of the major improvements they've made in pursuit of the ideal engine.