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4-Stroke-Engine-with-airflows numbers

Typical airflow in a four-stroke engine:
In stroke #1, the pistons suck in (aspirate) air to the combustion chamber through the opened inlet valve.

A naturally aspirated engine, also known as a normally aspirated engine, and abbreviated to N/A or NA, is an internal combustion engine in which air intake depends solely on atmospheric pressure and does not have forced induction through a turbocharger or a Supercharger.[1]

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