The two major engine types in use are spark ignition (gasoline engine) and compression ignition (diesel engine) which use different types of fuel.

常用的两大类内燃机是火花点火式(汽油机)和压缩点火式(柴油机)内燃机，他们使用不同种类的燃料。

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The result show that performance of engine will be improve by increasing compression ratio of engine and using best ignition advanced angle.

试验结果表明提高发动机压缩比和选择最佳点火提前角后，发动机性能有一定提高。

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Improper combustion, due to a rich mixture, defective ignition system, loss of compression in the engine, a cold engine, and so forth, will result in carbon deposits on the exhaust valves.

因混合气过浓、点火系统有故障、发动机内压力损失、冷机等导致的不正常燃烧都会形成气门积炭。

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