Design and develop the device of motorcycle engine compression ratio measuring system.

摩托车发动机压缩比测量装置的设计开发。

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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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Still, the new engine gets a 14-to-1 ratio for fuel-air compression, compared with the more common 10-to-1 ratio for engines.

新款引擎的燃料空气压缩率高达14比1，而一般的引擎只有10比1。

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Its Variable Compression Engine can alter its compression ratio (the volume in a cylinder when the piston is up compared with the volume when it is down) from 14-1 to 8-1, depending on the circumstances.

ECONOMIST: Fuel economy