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- Renewable gas fuels such as biogas and landfill gas are obtained from the biodegradable organic wastes so that they inherently have carbon-neutral nature which can respond global warming. Therefore, atten-tions are paid to use this renewable gases as a main fuel for i nternal combustion engines. However, the compo-sition of the fuel varies by its origin or conversion process, it is necessary to make stable combustion and ac-complish high efficiency when used in power generating spark ignition (SI) engines. In this study, efforts have been made to investigate the effect of the composition of renewable gas fuel on the engine performance and ex-haust emissions. In addition, a new spark plug with a long electrode was tested and compared with a base spark plug as a way to improve engine efficiency and reduce harmful emissions. Key words : Biogas, Landfill Gas, Gas Engine, Renewable Gas, Spark Plug 1) † Corresponding author:sunylee@kimm.re.kr Copyright ⓒ 2013 by The Korean Institute of Gas

Effects of Spark Plug Changes on Performance of an SI Engine Fueled by Gaseous Fuel