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The paper presents experimental investigation and numerical simulation of a commercial exhaust manifold gasket. Non-linearities in geometric and material behavior make exhaust manifold gasket modeling quite complicated. In the paper, two different FE modeling techniques are compared in order to suggest the best modeling way. Experimental data are collected in order to validate the numerical models. Differences between the two modeling techniques are emphasized and a choice criterion is suggested.

The design, the construction and the experimental characterization of a Continuously Variable Transmission (CVT) based on the rolling contact between conical bodies are analyzed. The studied CVT has been developed in order to allow a wide ratio range (up to 9), high torque capability (up to 500 Nm) and compactness. The main design problems and related solutions are explained focusing on the following aspects: contact area optimization, modular approach and development of different CVT versions to meet the current powertrain market needs. A total mechanical efficiency from 82% to 91% has been measured through experimental testing on a prototype.