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In order to increase the efficiency of internal combustion engines, Schaeffler Technologies recognized that it is necessary to identify the sources of energy losses, quantify such losses and to study ways to minimize them. Based on this premise, the Front End Accessory Drive parameters had to be investigated to locate where further potential enhancement is hidden. This paper aims to analyze and discuss about the main sources of energy losses occurring in FEAD and propose ways to optimize the system to the optimal range of efficiency and durability. Investigations showed that there are some loss points of the basic belt drive components which have good potential to be reducible, e.g., losses at bearings and belt.