Exhaust emissions especially from light duty gasoline engine\nare a major contributor to air pollution due to the large number of vehicles\non the road. The purpose of this study is to experimentally analyse the\nexhaust pollutant emissions of a four-stroke port fuel spark ignition\nengines operating using secondary butyl alcoholââ?¬â??gasoline blends by\npercentage volume of 5% (GBu5), 10% (GBu10) and 15% (GBu15) of\nsecondary butyl- alcohol (2-butanol) additives in gasoline fuels at 50% of\nwide throttle open. The exhaust emissions characteristics of the engine\nusing blended fuels was compared to the exhaust emissions of the engine\nwith gasoline fuels (G100) as a reference fuels. Exhaust emissions analysis\nresults show that all of the blended fuels produced lower CO by 8.6%,\n11.6% and 24.8% for GBu5, GBu10 and GBu15 respectively from 2500 to\n4000 RPM, while for HC, both GBu10 and GBu15 were lower than that\nG100 fuels at all engine speeds. In general, when the engine was operated\nusing blended fuels, the engine produced lower CO and HC, but higher\nCO2.
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