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The continuous increase of the green house emissions in conjunction with the limited and finite fuel resources make the improvement of efficiency of all engines, converting fuel chemical energy to mechanical energy, imperative. Even small increase in engine's mechanical efficiency, can be proved significant in economical and environmental terms. Towards this direction, the tribology studies of the Internal Combustion Engines, mainly used as propulsion, power generation and auxiliary drives, are considered important for the design of new engines and the improvement of existing ones. The objective of this paper is to present a simplified (analytical) model for the prediction of the instantaneous friction, developed on the main components of the piston-crank-slider mechanism of an internal combustion engine, including complete piston ring packs, piston skirts, connecting rod bearings and crankshaft main bearings.