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Study of Oil Consumption in Small-displacement 4-stroke Air-cooled Engines

Article of Honda R&D Technical Review Vol.23 No.1

Summary

A causal analysis of oil consumption was conducted for 4-stroke small-displacement air-cooled engines, which experience high temperature operations. The majority of oil consumption occurs as a result of oil loss that goes up into the combustion chamber, and the temperature of the cylinder walls affects the oil consumption rate. Results indicated that it was possible to control the oil consumption rate by reducing the cylinder wall temperature. It was also shown that the reduction of the width of the oil ring assembly and the increase of its coefficient of flexibility, in addition to the alleviation of the piston slap, were effective means to reduce the oil consumption rate. It was further demonstrated that the NOACK volatility of the oil has a significant effect on oil consumption in an air-cooled engine, in every part of which the temperature gets high.

Reference

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Author (organization or company)

Kazuhiro SAWAUMI(Motorcycle R&D Center)、Yasuo NAOI(Motorcycle R&D Center)

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