Temperature as symptom of thermal performance in poston-connecting rod correctness of combustion engine

The following article characterizes thermal operation in piston-connecting rod system of combustion engines in an energetic aspect, with regard to oil temperature in its bearings. It has been proposed to use, among others, oil temperature in slide bearings of piston-connecting rod system in combustion engines as symptom of thermal operation correctness. It results from energy exchange with its neighborhood whish is nothing else but gases contained in the combustion chamber and the elements of the piston-connecting rod system of combustion engines. This energy originates from chemical energy transformation of fuel into a thermal one and from friction in movable elements in the piston-connecting rod system of the engine. Special attention was also paid to the fact that the utilization of oil temperature as a symptom requires the knowledge of layer thickness changes, hydrodynamic pressure in the oil film and the load of the slide bearing.