In renewable energy resources, although biodiesels have occupied the top place as an alternative for compression ignition engines, their high NO<sub>x</sub> discharge causes concern. Retarded fuel injection is a probable solution to reduce NO<sub>x</sub> emission. In the present work, tests are conducted with corn seed methyl ester (CSME) blend at standard and retarded fuel injection timings. Improvement in brake thermal efficiency and reduction in NO<sub>x</sub> emissions are observed due to the retardation of fuel injection timing. DIESEL-RK engine simulation software is used as a potential tool to simulate retardation conditions, and simulation results are compared with experimental values. It is seen that along with the performance and combustion parameters, the simulated NO<sub>x</sub> emission results are in good agreement with experimental values. Hence, the modeling used in the DIESEL-RK software captures the experimental observations well.