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Effect of Base Oil on Two-Cycle Engine Oil Performances
Technical Paper
911275
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English
Abstract
Effect of base stock material, especially polybutene, on two-cycle engine oil performance was studied. At first, visible smoke tests were conducted, using test oils of different base stocks. Polybutene showed the best performance among the test oils.
Then, piston detergency tests were performed. Test oil of higher molecular weight polybutene showed poorer results. In addition, piston deposits were analyzed and it was found that polybutene molecular weight was increased during the test. Piston detergency was discussed in relation with the increase in viscosity caused by increase in molecular weight.
Finally, engine startability tests were carried out. Good correlation with viscosity was found only in test oils of same mineral base stock concentration. The increase in engine start torque was attributed to increase in polybutene viscosity caused by selective evaporation of the lower molecular weight portion.
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Authors
- Kunihiko Hosonuma - Nippon Mining Co., Ltd. * Kyodo Oil Technical Research Center Co., Ltd. ** Yamaha Motor Co., Ltd. Japan
- Yasuo Konishi - Nippon Mining Co., Ltd. * Kyodo Oil Technical Research Center Co., Ltd. ** Yamaha Motor Co., Ltd. Japan
- Yasushi Naitoh - Nippon Mining Co., Ltd. * Kyodo Oil Technical Research Center Co., Ltd. ** Yamaha Motor Co., Ltd. Japan
- Yoshinobu Yashiro - Nippon Mining Co., Ltd. * Kyodo Oil Technical Research Center Co., Ltd. ** Yamaha Motor Co., Ltd. Japan
- Hideaki Kawabe - Nippon Mining Co., Ltd. * Kyodo Oil Technical Research Center Co., Ltd. ** Yamaha Motor Co., Ltd. Japan
Topic
Citation
Hosonuma, K., Konishi, Y., Naitoh, Y., Yashiro, Y. et al., "Effect of Base Oil on Two-Cycle Engine Oil Performances," SAE Technical Paper 911275, 1991.Also In
References
- Sugiura Kensuke Kagaya Mineo “A Study of Visible Smoke Reduction from a Small Two-Stroke Engine Using Various Engine Lubricants” SAE Paper 770623
- Yashiro Yoshinobu “Reduction of Exhaust Smoke & Carbon Deposit at Exhaust Port in Two-Stroke Gasoline Engines” SAE Paper 871216
- Kagaya Mineo Ishimaru Mitsuaki “A New Challenge for High Performance Two-Cycle Engine Oils” SAE Paper 881619
- Sakurai Toshio Tamai Yasukatsu “Oyo Kaimen Kagaku” 244 Asakurashoten 1967
- Ohkawara Makoto “Kobunshi no Kagakuhanno” l36 Kagakudojin 1972