Up to the present， many problems on the startability of a diesel engine have remained to be solved. In this paper， the compression characteristics of a diesel engine with a divided chamber were made clear thermodynamically.0ur intent was then to improve the startability by shortening the ignition lag derived from the compression characteristics theoretically. As the result of experiments， an optimum condition of startability was obtained at a characteristic value Kopt which agreed with the theoretical one.
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