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This work aims study on the method of NOx reduction and performance enhancement by analysis of MPFI multi-cylinder gasoline engine running on LPG using the gas injection system and vaporized water-methanol induction to the intake manifold. For the generation of vaporized water-methanol, heat from the exhaust gas has been used. Different percentages of water- methanol by mass basis were used with variable engine speed ranging from 2000 to 4500 RPM. The outcomes indicated that as the percentage water-methanol induction level of the engine increased, there is a slight increase in percentage of useful work, while the NOx decreased drastically about 47%. Additionally, the engine brake thermal efficiency gains. The mean gain in the brake thermal efficiency for a 20% water methanol with LPG is approximately 1.5% over the use of LPG without water-methanol induction.

A numerical and experimental study on performance and emission characteristics of four-stroke, four-cylinder Multi Point Injection (MPI) engine operating on iso-butanol/gasoline blends was carried out. The study aims at extending the widely used Wiebe function to combustion modeling of alternate fuels. Quasi one-dimensional simulation and experiments were carried out for different blends of iso-butanol and gasoline (0% (pure gasoline), 10% (IB10), 20% (IB20), 30% (IB30), by volume of iso-butanol) at wide open throttle (WOT) condition for five engine speeds in the range of 2000 to 4000 rpm. The computational and experimental results complement each other validating the proposed extension. BSFC of the blends initially drops for IB10 and later rises with increase in concentration of iso-butanol. Compared to gasoline, the blends lead to considerable decrease in the amount of unburned hydrocarbons (HC) and no change of carbon monoxide (CO).