In 1998, Single Fuel Concept was adopted by NATO nations for the purpose of using one fuel for the land based military aircrafts, vehicles and equipment. The reason behind such a decision was not because of management and logistic benefits. This decision was also for smooth engine operation in the battlefield. JP-8 which is kerosene type turbine fuel and containing several additives for the military purpose was selected as the single fuel. JP-8 is originally used in the combat aircrafts, but it can also be used in CI engines, as its basic characteristics are similar to that of a diesel fuel. Although there have been a lot of experiments and studies on the use of JP-8 on CI engines, more research on the JP-8 combustion on CI engine is required for a better understanding about of the combustion process and preventing air pollution. Thus, this present study attempts to find out the optimal operation conditions that have a similar or better engine performance and lower exhaust emissions compared to the conditions of diesel fuel combustion. This study evaluates the effects injection timing, injection pressure, boost pressure, EGR rates, and engine load on a four-cylinder CI engine containing JP-8 with displacement volume of 2.2L