Effect of Enlarged Piston Top-land Clearance on Loc

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Description

Following points were confirmed regarding effects of an enlarged top-land clearance upon the lubricating oil consumption (LOC), by using a cut-back piston for a supercharged diesel engine. (1) It is a misconception that cut-back pistons prevent the ring back pressure drop. (2) LOC increases markedly as an oil scrape-up function if the top-land contacts intensely against the cylinder. (3) No combustion occurs at a narrow (normal) clearance, resulting in hard carbon deposit which in turn contacts intensity against the cylinder, while combustion occurs at a wide clearance, resulting in brittle carbon deposit which is easy to come off without causing any troubles.

Journal

  • Bulletin of JSME

    Bulletin of JSME 29 (254), 2576-2584, 1986

    The Japan Society of Mechanical Engineers

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