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The motivation of this paper is to describe the effects of variable valve timing (VVT) events on diesel engine performances. The paper describes an investigation into the effects of inlet and exhaust valve gas dynamics. In particular, effects on the pressure-volume cycle, and reverse flow through the intake and exhaust valves are studied. Computer simulation results show that VVT is much more useful for gasoline engines as compared with diesel engines for reducing the pumping losses. But, for diesel engines, VVT could be useful for the reduction of exhaust emissions such as NOx by using internal exhaust gas recirculation. The role of VVT in gasoline and diesel engines are described and compared.