An X engine is a four-cylinder or four-row single-shaft piston internal combustion engine. The cross-section of the X engine forms the shape of the letter X, hence the name.

An X engine is a special type of radial engine, but if it has only four cylinders, it is also a flat engine.

The Wankel rotary engine probably does not introduce, but in short, it is a type of combustion engine with a rotary piston that converts pressure into rotary motion. The four-stroke cycle takes place between the oval-shaped inner shell and the rotating piston, which is triangular.

The design of this engine has its advantages - the machine is compact, simpler to build (fewer moving parts), and can develop great power for its weight. Despite this, unlike Mazda, no other car manufacturer is dedicated to engine development.