The application of a tribological coating such as the Dylyn~RPlus offers the possibility to reduce factional losses in the valve train system. Besides the valve train, there are other parts of the engine where these coatings could help in friction reduction (e.g. the piston assembly). Through the experience gained from the racing industry we can estimate for future reference that one could even consider the use of lighter materials to decrease the moving mass, and therefore reduce friction and fuel consumption. Again, the wear resistance and low friction properties of the coating are the key parameters.In any case, it is necessary to consider the use of Diamond Like Carbon coatings at the beginning of the development phase. In order to integrate these coatings into a successful design, the substrate has to be selected in relation to the function of the coating that will be applied afterwards. Parameters like substrate material, heat treatment and surface roughness are of prime importance to allow the coating to reach the maximum performance. When all these elements are taken into account, this allows coatings to be used in a cost efficient way, thus increasing their penetration in high-volume automotive engine components.
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