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Influence of Ca-, Mg- and Na-Based Engine Oil Additives on Abnormal Combustion in a Spark-Ignition Engine
- Kenta Miura - Nihon University Graduate School ,
- Kento Shimizu - Nihon University Graduate School ,
- Norikuni Hayakawa - Nihon University Graduate School ,
- Tomomi Miyasaka - Nihon University Graduate School ,
- Akira Iijima - Nihon University ,
- Hideo Shoji - Nihon University ,
- Toshimasa Utaka - Idemitsu Kosan Co., Ltd. ,
- Kazushi Tamura - Idemitsu Kosan Co., Ltd. ,
- Hideki Kamano - Idemitsu Kosan Co., Ltd.
ISSN: 1946-3936, e-ISSN: 1946-3944
Published November 17, 2015 by Society of Automotive Engineers of Japan in Japan
Citation: Miura, K., Shimizu, K., Hayakawa, N., Miyasaka, T. et al., "Influence of Ca-, Mg- and Na-Based Engine Oil Additives on Abnormal Combustion in a Spark-Ignition Engine," SAE Int. J. Engines 9(1):452-457, 2016.
One issue of downsized and supercharged engines is low-speed pre-ignition (LSPI) that occurs in the low-speed and high-load operating region. One proposed cause of LSPI is the influence of the engine oil and its additives. However, the effect of engine oil additives on pre-ignition and the mechanism involved are still not fully understood. This study investigated the influence of engine oil additives on abnormal combustion in a spark-ignition engine. A four-stroke air-cooled single-cylinder engine with a side valve arrangement was used in conducting combustion experiments. The research methods used were in-cylinder pressure analysis, in-cylinder visualization and absorption spectroscopic analysis. Engine oil additives were mixed individually at a fixed concentration into a primary reference fuel with an octane number of 50 and their effect on knocking was investigated.