Nowadays car manufacturers must face the continuously tightening of greenhouse gases and pollutants emission regulations. Global warming threatens humans and planet health, forcing engine development for new technologies and solutions to be as fast as possible in order to comply with governments requirements on emissions. Therefore, CAE (Computer Aided Engineering) is becoming a very important resource in automotive industry. The possibility to reproduce systems behaviour with ever-growing reliability software enhances testing of new strategies while saving costs and time. Goal of the work was to define a new and innovative methodology to perform a dynamic simulation of a variable valve actuation system.