| Summary: | 碩士 === 國立彰化師範大學 === 車輛科技研究所 === 103 === This experiment is to detect the performance of engine by adjusting spark plug gap. There are 95 gasoline(G) and four fuel mixtures E10(10%ethanol), E20(20%ethanol), E30(30%ethanol) and E40(40%ethanol) in each SI engine test which is in WOT. The experiment can investigate the performance of engine and emission under these condition. This experiment shows that a torque is increased, the emissions CO and HC are decreased and the emissions NOx and CO2 are increased with increasing the proportion of ethanol in gasoline. The amplitude of engine vibration becomes larger, when an engine uses alcohol gasoline as fuel. The reduced plug gap makes the CO and HC emissions less. However the NOx, CO2 and amplitude raise. As the result, when fuel is alcohol gasoline blended fuels, and wide plug gap has the better torque in the engine.
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