Abstract

In this paper, by predicting the real time variation in wears of piston-ring face, ring-groove and cylinder bore altogether, the changing end gap of each ring and the changing volume of gas reservoir are calculated. Next, the calculated amount of parts’ wear and oil consumption are compared with the amount of normal wear of each part and normal oil consumption. Then, the durability limit of a piston-ring pack-cylinder bore system is predicted. Finally, the life time of a test engine in terms of abnormal oil consumption caused by the accumulated wear of ring faces and cylinder bore is estimated.

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