How the Combustion Engine Works (and Why It Matters)
 

The basic process of the four-stroke engine is the same as it was in 1876 when Nikolaus Otto invented it. The only differences between an engine that powers the 2017 CTS-V with 640 horsepower (HP) and the 3 HP engine created in 1876: efficiency and capacity. It boils down to compressing air and gas into a tiny space, lighting it on fire and transferring that energy into mechanical motion.

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