1991-11-01

The Method for Evaluation of Irregular Combustion in a 2-stroke Cycle Gasoline Engine 912617

2-stroke cycle gasoline engines are prone to irregular combustion at low speeds and under light loads. In motorcycles, this causes vibration of the body and adversely effects riding quality.A system for quantifying such irregular combustion was established so that the riding quality of a motorcycle could be assessed through a bench test of its engine.It was verified through a series of tests performed on this system that there is a significant correlation between the actual riding quality and σPmi assessed by the system.Accordingly, this system has become an effective means for predicting the riding quality of a motorcycle through a bench test of its engine.Making use of this system, it was also found that some of the typical engine operating factors, such as the air-fuel ratio and ignition timing, have optimum values for reducing irregular combustion in engines under certain conditions.

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