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This paper describes recent progress towards Direct Injection Diesel engine combustion simulation, involving both engine data measurements and 3D computational fluid dynamics. Experimental data were obtained in two different engines and it includes LDV measurements as well as an extended engine combustion data base. CFD simulations were performed with a modified version of the Kiva2 code and experimental data were used to get initial and boundary conditions and to validate the numerical results. The initial version of the Kiva2 code was enhanced to allow computation of quite complex geometries with different physical sub-models for turbulence, injection and combustion. The present version of the code can compute the engine cycle from start of intake stroke to the end of combustion with any inflow and wall boundary conditions. Turbulence may be simulated using both a k-ε model and a second order uiuj-ε model which was recently implemented in the code.