Petroleum products with the current consumption rate will be depleting in upcoming decades. Ethanol usage in the transport sector can fulfill the requirement and contribute to mitigate the greenhouse gas emissions of the vehicles. Hence it is better to develop the engine which can work on pure ethanol or add ethanol in the petrol and use the blends of that. This paper aim was to study the effect of ethanol/and blends on Spark Ignition (SI) engine behavior. The experiments were carried out on the 4-stroke spark ignition engine with pure petrol, pure ethanol and 10%, 20%, 40%, 60%, 80% ethanol-gasoline blend. The experiments were carried out at a constant speed of 3000 rpm for various loads of 25%, 50%, 75% and full load and emissions were analyzed. This study concludes that ethanol blending is lowering exhaust emissions with considerable improvement in the performance of the SI engine under part load and full load operations and also promising as a future fuel which can successfully replace petrol and its depletion problem.
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