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Now-a-days graphical user interface (GUI) is becoming an aided tool to simulate any engineering system. This is particularly true for IC engine simulations. In this paper a GUI has been developed using Matlab to predict the performance of four-stroke SI engines, and is named as Graphical and Numerical Engine Software Hub (GANESH). Using the developed software, the trends of the performance, as a function of some important engine variables are simulated. A limited amount of validation has been done. Additionally, parametric studies have been carried out to analyze the engine performance. The results obtained by solving appropriate process using thermodynamic equations are presented in the form of graphs. For progressive combustion simulation, three simple thermodynamic models have been employed. GUI assisted computer simulation models developed in this work provides results consistent with the experimental data as can be seen from validation. All processes involved in a four-stroke SI engine are simulated. The user friendly software developed can be used with ease and will be particularly useful for getting performance results which will reduce the development time.