In future, we suggest continuing conducting simulations and experimental tests to assess its performance. The proposed piston profile presents adequate results and behaviors. However, with the proposed piston, it was possible to reduce the effort and the material. Numerical simulations in the base piston and the new piston redesign proposal presented similar behaviors and results. Both models were evaluated and analyzed using the finite element method, where the most relevant physical conditions were temperature and pressure. Changes were applied to the profile of the piston head based on previous research and a new model was obtained. A commercial piston (base piston) was selected as a reference model to assess the piston head’s redesign. The methodology used was the mechanical engineering design process. The objective was to improve the combustion process and reduce polluting emissions using biodiesel blends as the fuel. In this study, the geometry of a piston head for a diesel engine was redesigned. However, technical problems must be solved, one of them is to improve the combustion process. Biofuels represent an energy option to mitigate polluting gases.