This research focuses on the effects of ignition timing on the combustion process in a 4-stroke internal combustion engine, analyzed using ALV-BOOST simulation software. Ignition timing, a critical parameter in engine operation, directly impacts cylinder pressure and temperature, which are key factors influencing engine performance and emissions. The study examines changes in these parameters by varying the ignition timing angle and evaluating the resulting effects. The results reveal that delaying the ignition timing reduces cylinder pressure as the combustion process begins later in the cycle, resulting in a less pronounced pressure buildup during the power stroke. On the other hand, the temperature within the cylinder increases, reaching a peak of approximately 1450 ℃, as the delayed combustion process provides less time for heat dissipation. This rise in temperature promotes faster engine heating and quicker activation of the catalytic converter, leading to improved exhaust gas treatment. These findings highlight the potential for optimizing ignition timing to enhance engine efficiency, reduce harmful emissions, and align with environmental sustainability goals while maintaining engine performance.