Effect of Ethanol Blends on a Spark Ignition, 4-Stroke, Internal Combustion Engine (original) (raw)
An increasing number of spark ignition, 4-stroke internal combustion engines use ethanol blends in the United States. Environmental concerns as well as the need for renewable energy sources have driven the government to encourage the use of ethanol blends. The reality is that the majority of the engines that use low percentage ethanol blends are designed to run on gasoline. The objective of this research was to determine the effect of ethanol blending on the performance and emissions of internal combustion engines that are calibrated to run on 100% gasoline. Experimental tests were performed on an engine using pure gasoline, 10% ethanol and 20% ethanol blends. The results of the study show that 10% ethanol blends can be used in internal combustion engines without any negative drawbacks. The fuel conversion efficiency remains the same, while CO emissions are greatly reduced. 20% ethanol blends decrease the fuel conversion efficiency and brake power of an engine, but still reduces CO emissions.
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