High Quality Content by WIKIPEDIA articles! A naturally-aspirated engine is one common type reciprocating piston internal combustion engine that depends solely on atmospheric pressure to counter the partial vacuum in the induction tract to draw in combustion air. This is in contrast to a forced induction engine, in which a mechanically-driven supercharger, or an exhaust-driven turbocharger is employed to facilitate in increasing the mass of intake air beyond what could be produced by atmospheric pressure alone. In a naturally-aspirated engine; air for combustion (diesel cycle in a diesel engine, or specific types of Otto cycle in petrol engines - namely gasoline direct injection), or an air/fuel mixture (traditional Otto cycle petrol engines) is drawn into the the engines cylinders by atmospheric pressure acting against a partial vacuum that occurs as the piston travels downwards toward bottom dead centre during the induction stroke.

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