The paper describes a mathematical model of gas flow through crevices between the piston, rings and cylinder in internal combustion engines. The model has been developed to study the influence of numerous. design parameters and engine operation condition on piston ring pack behaviour and the exhaust gases blowby from the combustion chamber to the crankcase. The model integrates the gas flow and axial rings displacements in the grooves, and separately treats lands between piston, cylinder and adjacent rings and regions in the grooves behind the rings. The heat transfer between the gas and the surrounding surfaces is calculated and emphasis is placed on considering the influence of wear and thermal deformations of elements on ring pack performance.

The paper presents computer application of the mathematical model of piston- ring-cylinder packing, which was described in detail in the first part of the paper. Methodology of selection of the input data, results of primary calculations and the method of model verification are also shown. The results allow acknowledging the mathematical model as verified.