Abstract-- Considering pollution problems today, investigations have been concentrated on lowering the concentration of toxic components in combustion products. The purpose of this project is to experimentally study of using Naphtha which is produced in Annajaf city refinery as an alternative fuel instead of the commercial gasoline which is imported to Iraq from the neighborhood countries. In this project, experiments have been done to measure the performance and emissions of a 4-stroke S.I. Engine, one by using the commercial imported gasoline, another by using the Annajaf city naphtha, and finally by using the naphtha-methanol blends. Results showed that; the use of 7 vol. % of methanol blending with the naphtha appears to be a good option for replacing any oxygenate additives in the naphtha, where the CO, CO2, and HC are minimum and the fuel consumption of the blend is lower than of the commercial gasoline. Also, the noise results showed that; the engine runs smoother at 7 vol. % methanol blend than the commercial gasoline. That is mean increase in engine life due to the lowering vibration
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