The central part of an internal combustion diesel engine is the piston. The piston functions as the main driver in an internal combustion diesel engine. Researchers have made several modified piston models in the crown area with the lateral swirl combustion system (LSCS) model in three dimensions. The objective of this study is to determine which model is better between the LSCS 47 piston with a convex edge distance of 18° and the LSCS 47 piston with a convex edge distance of 22.5°. In this research, we will use the finite element method to conduct numerical simulations of modified pistons in internal combustion diesel engines. Simulation tests were carried out on the piston using ANSYS software, creating a three-dimensional CAD model of the piston using SOLIDWORKS software. One static structural simulation was carried out with a pressure of 20 MPa, which produced total deformation, equivalent (von Mises) stress, damage, life, and safety factors. The simulation findings indicate that the LSCS 47 piston, with a spacing of 18° between its convex edges, exhibited certain outcomes, the deformation produced by the piston is 0.12179 mm (max) and 0 mm (min); in the equivalent (von Mises) stress analysis it is 1581.7 MPa (max) and 0.20809 MPa (min), the resulting damage value is 1032 (max) and 10 (min), the life value is 108 (max) and 0 (min) and the safety factor value is 15 (max) and 0.052309 (min). Meanwhile, on the LSCS 47 piston (distance between convex edges 22.5°), the deformation produced by the piston is 0.11052 mm (max) and 0 mm (min); in the equivalent (von Mises) stress analysis it is 225.15 MPa (max) and 0.072245 MPa (min), the resulting damage value is 81544 (max) and 10 (min), the life value is 1e8 (max) and 12,263 (min) and the safety factor value is 15 (max) and 0.36748 (min). The research findings indicate that the LSCS 47 piston with a distance of 18° between convex edges exhibits superior performance in terms of total deformation, equivalent (von Mises) stress, damage, life, and safety factor values compared to the LSCS 47 piston with a distance of 22.5° between convex edges.