Fuel conversion efficiency and simultaneous reduction in emission are the major challenges in front of automotive research. Improving the air motion like swirl in CI engines and tumble in SI engines increases the air fuel mixing and thereby combustion efficiency. The main objective of this article is to investigate the ways to improve swirl characteristics of CI engine through different configurations of intake valve. This study aims to achieve improved air/fuel mixing by replacing conventional valves with swirl enhancing guide surfaces incorporated onto the inlet valve and compare the proposed geometries. Three modified inlet valves, namely flat vane - curved vane 1 and curved vane 2 - have been investigated. To quantify the effects that are caused by these valves, a 3-dimensional numerical study of the in-cylinder flow conditions is performed using CFD (Computational Fluid Dynamics) technique. Each design is analyzed for swirl characteristics at different sections of the cylinder head, followed by an experimental validation of the analysis using steady state air flow bench test to analyze the swirl generation. The swirl parameters were evaluated in the modified geometries of the intake valve and compared with reference engine valve. A swirl ratio increase of 0.5 was observed on curved vane - 2 when compared to the conventional poppet valve. The results of the experiment are then compared to the numerical solutions to analyze the trend. It was observed that the proposed valves show better swirl characteristics than the conventional valve. © IAEME Publication.