Abstract: In this study, the simulation results obtained by using the AVL FIRE code for a spark ignition (SI) engine are compared with experimental data. Computational fluid dynamics (CFD) is able to significantly reduce the number of experimental tests and measurements and lower the development time and costs. However, some parameters which are needed for CFD calculation must be achieved experimentally such as turbulence length scale. The CFD simulations demonstrated good agreement to the measured data. The Results show that, applying appropriate constants of each combustion model including eddy break up model (Ebu), probability density function (PDF) and coherent flamelet model (Cfm) causes the computational results to be in agreement with experimental results. Furthermore the results show that the nearest prediction in comparison with experimental results is by applying the Ebu model.