Abstract
This work investigates the effects of ethanol-blended gasoline fuels on a motorcycle engine's power performance and emission reduction compared with conventional gasoline fuel. Experiments were conducted on different ethanol-blended fuels E0, E30, E50, E85, and E100 for a spark-ignition motorcycle engine at various engine speeds and loads. The brake power increased with the ethanol blending ratio; E100 fuel produced the highest brake power, and E0 fuel made the lowest. The rise of ethanol in blends contributed to the retarding of ignition and reducing the peak combustion pressure and maximum heat release. The CO emission for E100 and its blends was less than gasoline fuel. The HC emissions decreased with the increase in ethanol blending ratio, and the difference was more considerable for E0 and E100 fuels at low engine speed than at higher engine speeds. Compared with E0 fuel, ethanol blends had lower NOx emissions and greater reduction levels.
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