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Recent market demand enforces on the reciprocating engines to work with the highest possible efficiency. In order to face this challenge the operating parameters of the engines are constantly increasing. This results in the engineering difficulties including development of high temperature materials, high pressure combustion chamber sealing and enhanced wear or fretting of engine components. The work presents a new approach to the problem of selection of the piston sealing ring geometry. The first part of the research focuses on the description of the tool which was delivering the ring geometry. This part also provides the verification of proposed ring geometries using finite element method (FEM) software. The second part of the work presents the optimization of the shape of the piston sealing ring. The aim of the optimization was to eliminate the contact pressure variances between the piston sealing ring and cylinder liner. This methodology permits limiting the wearing of the cylinder liner, improving ring sealing abilities and reducing number of the sealing rings in the piston.