Abstract: This study presents the gas flow pressure in the intake port of four-stroke direct-injection compression ignition engine using GT-Suite software for steady-state and transient simulation. To investigate and simulate the intake port gas flow pressure profile of compression ignition engine is using GT-Power engine model were developed in this study. GT-Power is sub-system menu from GT-Suite. The engine model is developed from the real compression ignition engine data and input to software library. In this research, the simulation of engine model is running in variations engine speeds. The simulation output data is collected from the GT-Post results plots and cases RLT in post processing. The simulation results of the intake port engine model are shown the characters in intake port pressure profile of engine in variations engine speeds. The detail performance intake port gas flow pressure is shown in graphs in this study.