The present study provides a feasible strategy for minimizing automotive CO2 emissions\nby coupling the principle of the Atkinson cycle with the use of bioethanol fuel. Motor cycles and\nscooters have a stroke to bore ratio of less than unity, which allows higher speeds. The expansion\nto compression ratio (ECR) of these engines can be altered by tuning the opening time of the intake\nand exhaust valves. The effect of ECR on fuel consumption and the feasibility of ethanol fuels are\nstill not clear, especially for short stroke engines. Hence, in this study, the valve timing of a short\nstroke engine was tuned in order to explore potential bioethanol applications. The effect of valve\ntiming on engine performance was theoretically and experimentally investigated. In addition, the\napplication of ethanol/gasoline blended fuels, E3, E20, E50, and E85, were examined. The results\nshow that consumption, as well as engine performance of short stroke motorcycle engines, can be\nimproved by correctly setting the valve controls. In addition, ethanol/gasoline blended fuel can\nbe used up to a composition of 20% without engine modification. The ignition time needs to be\nadjusted in fuel with higher compositions of blended ethanol. The fuel economy of a short stroke\nengine cannot be sharply improved using an Atkinson cycle, but CO2 emissions can be reduced using\nethanol/gasoline blended fuel. The present study demonstrates the effect of ECR on the performance\nof short stroke engines, and explores the feasibility of applying ethanol/gasoline blended fuel to it.
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