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In this study, a computer program has been developed which predicts the variation of the volumetric efficiency with the change of design of the intake system effectively by the analysis of the flow in each part of a multi-cylinder compression ignition engine. For the calculation of the flow in the intake and exhaust systems, the method of characteristics has been used, and the double Wiebe's function has been adopted for the calculation of the heat release rate in the cylinders. The accuracy of presented method has been proved through the comparison between the simulation and the experimental results over the various engine speeds and intake pipe lengths.

The objective of this study is to find the effect of the dynamic pressure wave on the volumetric efficiency by analyzing the fluid flow in the intake and exhaust manifolds, and to get the optimal design criteria for the intake manifold. This study showed that five to ten percent of volumetric efficiency could be increased by the optimum design of the intake manifold without modification of the engine main body. A finite difference model was developed using two-step Lax-Wendroff method to solve the governing equations of air flow in the intake and exhaust manifolds. The results of this study are summarized as follows: 1. The optimum length of intake manifold for the maximum volumetric efficiency can exist for each specified engine speed and manifold diameter. 2.