| 1. | Initially it had a naturally aspirated engine but later versions were Turbocharged.
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| 2. | An engine without forced induction is considered a naturally aspirated engine.
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| 3. | The new rules allowed 1500 cc supercharged and 4500 cc naturally aspirated engines.
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| 4. | A distributor-operated ignition system was provided for naturally aspirated engines in some markets.
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| 5. | Such an engine cannot be achieved by normally-aspirated engine design alone.
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| 6. | This is also claimed to be the most powerful production 1.6l naturally aspirated engine.
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| 7. | High compression on a naturally aspirated engine can reach the detonation threshold fairly easily.
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| 8. | He was the only one with a normally aspirated engine.
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| 9. | Initial engine choices included 1.6-, 1.8-and 2.0-liter naturally aspirated engines.
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| 10. | The SLS AMG was also Mercedes-Benz's last naturally aspirated engine.
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