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The purpose of the paper is to present injection results of heavy fuel spray at room temperature conditions and combustion predictions in a medium speed diesel engine using the k-ε turbulence model in KIVA2. The work consists of two main parts. In the first, the heavy fuel spray is simulated at cold test chamber conditions in which the density of gas is of the same order of magnitude as in the engine at the end of compression. The predicted spray tip penetration and droplet sizes are compared to the measured values. The second part deals with the combustion simulation using the Magnussen and Hjertager ( M&H ) or Magnussen Eddy Dissipation Concept ( EDC ) turbulent diffusion combustion model. The cylinder pressures and heat release in the simulation are compared to the measured values.