An intake manifold is the essential part of internal combustion engine regarding the performance. The intake manifold consists of plenum chamber and runners. The function of the manifold is to evenly distribute the combustion of air-fuel mixture to all intake port in the cylinder head. This equal distribution is important to optimize the performance and efficiency of the S.I engine. Uneven air distribution leads to low volumetric efficiency, power loss and increased fuel consumption. The study

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... f various research works indicating increase in volumetric efficiency and even distribution of air-fuel mixture to all runners with different methods. There is scope to change the shape and geometry of intake manifold plenum chamber and increase its volumetric efficiency. Such review will help in forming the basis for a proposed research work in the similar direction. The computational fluid dynamics (CFD) software is used to analyse the intake manifold performance of multi cylinder S.I engine.