The loss in piston work due to the early opening of the exhaust valve is less than offset by better charging and scavenging of the engine.

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Superchargers and turbochargers are both devices that can increase the power of an internal combustion engine: Superchargers: Compress air above atmospheric pressure without creating a vacuum. This forces more air into the engine, allowing the engine to burn more fuel and produce more power. Superchargers are usually the best choice for smaller engines. Turbochargers: A forced induction device that uses the energy of the exhaust flow to compress the intake air. This forces more air into the engine, producing more power for a given displacement. Turbochargers are better for larger... Show more

The loss in piston work due to the early opening of the exhaust valve is less than offset by better charging and scavenging of the engine.