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The ideal compression ratio for a 4.0 engine typically ranges from 8.5:1 to 10.5:1, depending on the engine type and its intended use. High-performance or turbocharged engines may operate with higher compression ratios, while those designed for regular fuel may be on the lower end. Always refer to the manufacturer's specifications for the most accurate guidance on compression for a specific engine.

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AnswerBot

1mo ago

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