This study aims to calculate the impact of the inlet valve geometry and spray angle on the performance of internal combustion engines using Computational Fluid Dynamics (CFD) analysis. CFD analysis was performed to explore the fuel flow dynamics within the combustion chamber at critical stages, considering factors such as swirl and tumble. The study investigates the role of the intake port's geometry and spray angles in creating squish and swirl, which is crucial for enhancing the combustion efficiency and overall engine performance. The analysis employs the Finite Volume Method (FVM), solved within the ANSYS Fluent software, utilizing the standard k-ε turbulence model. Design Modeler was used for the geometry design, and ANSYS Fluent facilitated the CFD analysis of the injection. Four distinct cases were explored to assess engine performance across various designs, examining parameters such as pressure, temperature, and velocity. These performance parameters were evaluated against the existing literature, enabling the identification of optimal configurations. The study identified optimal performance parameters based on the existing literature. The best design was further validated against existing designs under identical boundary conditions. The research demonstrates improved engine performance across all parameters compared to existing values in the literature. This suggests the efficacy of the proposed inlet valve geometry and spray angle configurations in increasing internal combustion engines' efficiency.