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This paper investigates the performance and emission characteristics of   single cylinder four stroke petrol engine using unleaded gasoline with   combination of ethanol and diethyl ether. Exhaust emissions were analysed for   CO, HC, NOx, and CO2 by varying engine torque and engine speed. The result   showed that the blend of unleaded gasoline with diethyl ether increases the   octane number which in turn increases the power output which leads to   increase in the brake thermal efficiency of the engine. The CO, HC, and NOx   emissions concentrations in the engine exhaust decreases while the CO2   concentration increases. The use of diethyl ether and ethanol blends as a   fuel additive to unleaded gasoline causes an improvement in performance and   significant reduction in exhaust emission

Influence of diethyl ether blend in spark ignition engine performance and emissions operated with gasoline and ethanol