A Numerical Study on the Application of Järvi Mechanism to a Four Stroke Engine for Motorcycle Application

In this paper the feasibility of the application of a system conceived by Järvi to a 125 cm³, four strokes motorcycle engine built by Piaggio Company is investigated. This study was carried out using a one-dimensional model built with the well known CFD 1D code Wave and validated in a previous work. An analytical study was performed on the kinematic scheme of the mechanism in order to establish the relationship between control ramp and valve lift. The control ramp shape was then optimized accordingly with the results of the fluid dynamic analysis performed through the above mentioned Wave model.