1. Introduction
Ananalysisoftheengineperformanceaswellascriteria for developing of the inletand exhaustpipe system require the deep knowledge about acoustics of the both systems. The up-to-date known information from this area can be summarized into several conclusions.
In many scientific articles there are presented experimental results and theoretical models of the acoustic waves and their impact on global efficiency of the piston combustion engines. The fundamental information sources about the instable gas dynamics in internal distribution channels of combustion engines were presented during the 1950sof the last century.Measuringmethodsofthe local throughput in the pipe, together with computerised calculations, were improved considerably during the 1980s [1]. A complete overview of topical knowledge oriented to the analysis and proposal of the inlet (suction)