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Transactions of Society of Automotive Engineers of Japan
Oil drain holes of a piston affects engine oil consumption, but there is no theoretical guidance for optimal design. This study aimed for clarifying the effect of design of oil-drain-hole on oil behavior under the oil-ring to estimate mechanism for oil pressure generating. The oil pressure variations under the oil-ring in the circumferential direction was measured using a gasoline engine. An increase in oil pressure was found during down-stroke of the piston. The lowest oil pressure was founddoi:10.11351/jsaeronbun.48.59 fatcat:a4khlpfubvc3da7pyy3gu3oo3y