Nowadays pollutant emissions in the atmosphere are at stake. In the field of automotive industry, the reduction of CO2 emissions lies mostly on improving engine efficiency. This study about textured surface on micro- and nano-scale aims to diminish the friction losses in internal combustion engine.The main element is the piston ring pack because of the creation of 40 percent in friction losses. This analysis consists in LASER texturing with cavities on the surface of the first piston ring. The tribological behavior of textured surfaces is lead in Boundary and ElastoHydroDynamic (EHD) regime. In EHD regime the impact on load capacity of lubricant and frictional behavior in textured surface show linking between experimental parameters as surfaces cinematic, contact pressure, retention volume of oil, the dwelling time of cavities and the geometrical parameters as diameter, cavity depth and cavity density. In Boundary lubrication, the effect of cavities on tribological behavior has led to confirm the hypothesis of trapped debris in the cavities and to make in evidence swallow network of cavities reducing friction coefficient.
