Therefore, you need to be careful about over specifying the compression ratio.

因此，应该注意不要指定过高的压缩率。

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Ideally, an ethanol engine needs a compression ratio of 19:1 instead of the 10:1 typical of petrol engines.

理想情况下，乙醇发动机需要的压缩比是19：1，而不是典型汽油引擎的10：1。

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The main focus of this group is to achieve the highest compression ratio.

这类压缩器主要侧重于实现最高的压缩比。

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This means that the compression ratio of an ICE using ethanol can be taken up to 24:1 compression ratio before preignition begins to happen.

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The higher the compression ratio, the higher the power output and the higher the thermal efficiency.

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The higher the octane number, the greater the resistance to preignition making a higher compression ratio possible.

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