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In the present paper the application of a scavenging model in a two stroke Diesel engine with four radial cylinders and symmetric scavenging forced by a turbocharger is described. Besides the engine model, the turbocharger and pulse converter, where the exhaust pipes end, were simulated as described in the text. The empirical coefficients have been fixed by means of the comparative study of the results obtained with a three-dimensional model. The simulation model has been used in two cases, for the validation of itself, comparing the results obtained with the measurements in a test rig, and for the prediction of the performances of the four radial cylinders of the Diesel engine described in a previously published paper.