Abstract
The author et al. made glass cylinder engine in which closed gap of piston ring could be visualized based on the idea that follow-up characteristic of piston ring to the sliding surface of bore in internal combustion engine, could be evaluated from minute change of closed gap of piston ring. This newly-devised visualized engine was an in-line 4-cylinder engine, capable of running up to 6000 rpm, in which we could observe closed gap of piston ring minutely during operation.As the result of the evaluation of the follow-up characteristic of piston ring with this equipment, it was found that going-up passage of oil was widened and so, oil consumption increased, because abnormal behavior, that is, the separation of piston ring from deformed bore sliding surface at the time of goingdown of piston, happened in high speed area.
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