Spark plugs only ignite the fuel mixture near the spark gap, reducing the combustion efficiency, and the metal that makes them up is slowly eroded as they age.

火花塞只点燃火花隙附近的燃料混合物，这就降低了燃烧效率，并且随着使用年限增加火花塞中的金属慢慢被侵蚀。

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Another model, the "Oorja", developed by BP and the Indian Institute of Science, has an integrated battery-powered fan to direct air to wood pellets in the combustion chamber, improving efficiency.

另一个模型，“Oorja”，由BP和印度科学院开发，拥有一个内置的电池驱动风扇来使空气对准燃烧室内的木球，从而提高效能。

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The way fuel is "atomised" has profound effects on the efficiency of combustion engines.

燃料被“雾化”的方式对于内燃机效率有着深远的影响。

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High-efficiency internal combustion engines combined with lightweight materials can dramatically increase fuel efficiency in cars and trucks.

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The key to thermal efficiency for internal combustion engines is compression ratio.

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Now, it's true that amazing gains are being made in the efficiency of internal combustion engines, both gas and diesel: direct injection, cylinder deactivation, stop-start, eco-mode throttle mapping, to name a few of the recent applied technologies.

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