The current computational fluid dynamics (CFD) speculate reveals piston bowl geometry’s impact on an immediate base engine execution and discharge. Different bowl shapes, that is, shallow combustion chamber, hemispheric combustion chamber, and toroidal combustion chamber (TCC), were made with a reference compression ratio of 17.5:1. ANSYS V18.1 was used for numerical investigation, in tandem with the wise burning model. It was clearly identified that TCC cylinder bowl geometry delivered the proper air–fuel mixing blend inside the cylinder chamber, which prompts a homogeneous charge. Further, analytical experiments were completed to break down the TCC cylinder bowl geometry by shifting the profundity of the bowls. The case with 1.26 mm decline top to bottom of the bowl from the benchmark TCC and covered with zirconium coating gives better results. TCC produced a very powerful squish over a short period of time. TCC’s fraction of mass in carbon monoxide emissions is down to 0.03 at 25o crank angle after TDC while both hemispherical combustion chamber and shallow depth combustion chamber are measured at nearly 0.1. It was found that TCC gave a better performance compared with the other two designs at full load conditions while operating from medium to high engine speed. Overall, the low-speed application of the engine was suitable for SCC design, and TCC design was suitable for higher-speed application.