“Normally aspirated” is a fancy way of saying an engine isn’t turbocharged or supercharged.
Aspiration means drawing in by suction, which explains how a typical engine brings air into its intake manifold and then its cylinders. Turbochargers and superchargers, on the other hand, force air into their engines’ intake manifolds at greater-than-atmospheric pressure. Such an engine would be referred to generally as a forced-air-induction engine.
Information for this was taken from the Cars.com’s glossary, written by Joe Wiesenfelder.
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