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The combustion and flow results of experimental and numerical investigations conducted on a stationary direct injection engine are presented in this paper. Experiments are conducted at a speed of 1500 rpm with the standard hemispherical piston at full load condition. A three dimensional finite volume model of the baseline engine with hemispherical piston (HCC) was created and the reacting flow simulation for it provided good agreement with experimental data. Further simulations are conducted for the reacting flow with modified pistons of shallow combustion chamber (SCC) and torroidal combustion chamber (TCC) configurations. In the design perspective, the geometric dimensions of the pistons are chosen so as to maintain the same piston bowl volume. From the numerical study, tt was revealed that both modified pistons generate higher pressure, with TCC piston producing a highest pressure for the same quantity of fuel injected.