In this paper, the situation of KIA pride engine intake valve timing has been investigated. To achieve this goal, the geometry of combustion chamber with intake and exhaust valves and runners has been modeled in CATIA. The developed geometry has been transferred to ICEM_CFD package for mesh generation process. In this package, the appropriate grid has been generated for KIVA-3V code, considering all the limitation (1, 2). The simulation process has been accomplished for different engine speeds and validated using available experimental data. Considering the amount of air in combustion chamber right after inlet valve closes, the best valve timing to have maximum volumetric efficiency has been determined. By applying this modification to intake valve timing, the volumetric efficiency increased about 15 percent at low engine speeds. The results of this research can be used for VVT design for the engine.

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