Abstract
The reduction of lubricating oil consumption in the internal combustion engines is important for clearing the emission standard and environmental problem, especially the hydrocarbon and particulate matter. Recently, it is reported that lubricating oil which exist near the piston ring or piston crown effects strongly for occurrence of pre-ignition in highly supercharged spark ignition engines. This paper describes results of a study on the mechanism of lubricating oil consumption from the top ring with piston motion. The experimental and calculated data show that it is effective the surface treatment of piston ring to reduce lubricating oil consumption. The wetting angle on the piston ring and the viscosity of the lubricant oil are key parameters for lubricating oil consumption from the top ring.
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