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A mathematical and simulation model has been developed to simulate a spark ignition engineoperation cycle. The programme written from this simulation model and modified so can be used toassist in the design of a spark ignition engine for alternative fuels as well as to study many designparameters such as the effect of engine design parameter like stroke and diameter of the cylinder onthe performance and exhaust emissions of spark ignition engines. In this paper, the description ofthree type of engines design parameters according to (stroke/diameter) which are called undersquare, square and over square engines using three type of fuel (gasoline, LPG, CNG) singly havebeen taken. The variations of power output, thermal efficiency, specific fuel consumption, ignitiondelay, temperature of exhaust gases, heat loss and the exhaust emissions (CO2, CO, NO, O2) byvolume, were calculated for each type of engine and then comparing the results to investigate how toincrease engine efficiency and reduce exhaust emissions. The accuracy of the present model isconfirmed by comparison with experimental result that have established by previous literatures andthe results were agreement with literatures. The main results obtained from the present study showsthat, the square engines (S/D=1) can be considered as most efficient, modern and suitable design forengines running by gasoline and alternative fuels like LPG and CNG, because of higher poweroutput due to the suitable piston area for pressure distribution. The area of flame front which maycreate higher combustion qualities and higher thermal efficiency through faster burning and loweroverall chamber heat loss, also, the potential of the square engines (S/D=1) for indicate specific fuelconsumption was 4% improved

A SIMULATE MODEL FOR ANALYZING THE EFFECT OF ENGINE DESIGN PARAMETERS ON THE PERFORMANCE AND EMISSIONS OF SPARK IGNITION ENGINES