Naturally aspirated engine
Type of internal combustion engine / From Wikipedia, the free encyclopedia
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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]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/3/35/4-Stroke-Engine-with-airflows_numbers.gif/170px-4-Stroke-Engine-with-airflows_numbers.gif)
In stroke #1, the pistons suck in (aspirate) air to the combustion chamber through the opened inlet valve.