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The combustion process and NOx emission of the world's largest medium speed diesel engine, the Wärtsilä W64L (W64L), were simulated with the modified Kiva2-CFD code. The following submodels were added to the standard Kiva2 code: The Magnussen EDC (Eddy Dissipation Concept) turbulent mixing combustion model, the extended Zeldovich NO model and a simple rebounding model for the droplet wall impingement. The Tesner&Magnussen soot formation and combustion model was implemented in the code, but it has not yet been used in this stage. The modified TAB model was used for the spray. The simulation results, such as the cylinder pressure, the heat release rate and the cumulative heat release were compared to the measured values of the W64L engine. The spray model correctness was tested by comparing the predicted spray tip penetration with Hiroyasu's correlation at room temperature conditions.