A naturally-aspirated engine or (often incorrectly referred to as) normally-aspirated engine (or "N/A" - aspiration meaning breathing) refers to an internal combustion engine (normally petrol or diesel powered) that is neither turbocharged nor supercharged. Most automobile gasoline (petrol) engines are naturally-aspirated, though turbochargers and superchargers have enjoyed periods of success, particularly in the late 1980s and the current 2000s era. However, most road-going diesel-engined vehicles use turbochargers and intercoolers, because naturally-aspirated diesels generally cannot offer suitable power-to-weight ratios to be acceptable in the modern car market.
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