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Extensive research is being carried out to improve the volumetric efficiency of the engine by improving port flow. Port flow characteristics plays vital role in determining the overall performance of SI engine. Higher volumetric efficiency demands the flow capacity of the ports. Steady-state flow bench testing and CFD steady flow simulation analyses are widely used promising tools in the process of port development for flow optimization. CFD port flow simulation adds cost effectiveness to the port modification process. With help of port flow information obtained from the flow bench testing, the engine power curve and system dynamics can be roughly estimated. However actual engine running is transient in behavior, i.e. the pressure difference varies widely during the whole cycle whereas the port flow testing on flow bench is steady state in nature. In the flow bench testing, the effects such as cyclic acceleration and deceleration of fuel-air column are not accounted.