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Kiva-3v Release 2 has been used to investigate combustion and emissions formation processes in a direct injection diesel engine with a high pressure common rail injection system. The influence of split main ratio and separation on NO and soot emissions have been of particular interest. Model validation has been based on comparisons with experimental data for heat release and engine-out emissions. Simulations have been carried out to explore the temporal development of combustion processes under typical part-load operating conditions. The results presented are for an engine speed and BMEP of 1600 rev/min and 6.76 bar, respectively.