How Does a Combustion Engine's Valvetrain Work?

Take a look at what really happens as the valves usher fuel and air into the engine and let the exhaust out.

Dan Carney, Senior Editor

December 5, 2023

This installment of Toyota's Engines 101 series takes a closer look at one of the most critical parts of an engine: its valvetrain. The video establishes what parts comprise a valvetrain, looks at variable valve timing technology, and considers the effect of alternatives to the Otto cycle valve timing scheme, such as the Atkinson cycle.

Prius_2ZR_FXEcutaway_8FA1061C1BDF5969346FD8DA025C7DE46F7D6DB3.jpg

This cutaway image reveals the secrets of Toyota's 2ZR engine. TOYOTA

About the Author(s)

Dan Carney

Dan Carney

Senior Editor, Design News

Dan’s coverage of the auto industry over three decades has taken him to the racetracks, automotive engineering centers, vehicle simulators, wind tunnels, and crash-test labs of the world.

See more from Dan Carney

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