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Influence of the Piston Ring Shape in a Free State on the Efficiency of Sealing the Combustion Chamber

One of the most common reasons for failure of piston machines in general and internal combustion engines in particular, is a violation of the sealing of the “cylinder liner - piston ring” interface. This article provides an analysis of calculation methods highlighted in open literature, which showed that all known methods have their own errors due to generally accepted assumptions that significantly affect the accuracy of the calculation. For the method, noted in the sources as the most accurate of the known at a given time, an analysis of the results was carried out, which showed that it also contains inaccuracies.