The present work has been developed in POWERTECH Engineering S.r.l., an important consulting firm in the field of the fluid dynamic simulation in collaboration with Alfa Romeo-Maserati (ARM). The reference engine is the V6 spark ignition engine already equipped on the Alfa Romeo Giulia Quadrifoglio. The present study is aimed to exploit the unquestionable advantages of the virtual simulation in terms of reliability of results and quickness of data gathering, for the representation of the thermal inertia and surface temperatures of the engine, as well as the heat rejected to coolant. Starting from the engine model provided with a 3D mesh for the evaluation of the thermal behaviour, instead of the simplified representation, the activity was firstly aimed to the calibration of the same thanks to the experimental data provided by the customer.