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Analysis of SI Engine Operation and Emission Characteristics with Low Octane Gasoline and Ether Additive

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Fuel quality is an important indicator for the efficient operation of SI engine. Gasoline fuel is produced in many countries under specifications that did not meet the standard specifications that negatively affect engine operation efficiency. Hence, in this study, the impact of Methyl tertiary butyl ether addition to local low octane gasoline on the performance of spark ignition engines and exhaust emission characteristics has been investigated. The fuel samples prepared with additive ratio selected by 5%, 10% and 15% in addition to local gasoline as a comparison threshold. Engine test has been performed and the resulted data collected at constant engine load and increasing speed. Study results reveal noticeable improvement in engine brake power and BSFC at medium and high engine speed with MTBE additive and the maximum improvement obtained with the addition of 10% MTBE to local gasoline at 3000 rpm engine speed. Increasing MTBE additive with local gasoline results in reducing HC and CO emission for all ratios and the minimum value of these emissions obtained with 15% MTBE over the whole engine speed with an increase in CO2 emission. Based on the obtained results, introducing MTBE at 10% additive ratio is suitable to improve the engine performance and mitigate the engine emissions compared to local low octane gasoline.
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Local Gasoline; Octane Number; Fuel Additives; MTBE; Engine Performance

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