Engine Output Increase of Two-stroke Combustion with Exhaust System Optimization

Original scientific paper In principle, an exhaust system influences the maximum output and characteristic of a two-stroke combustion engine. The first part of the contribution deals with the possibility of transformation in a maximum output and a range of exploitable speed values by means of the change of exhaust manifold length in exhaust pipe section. This knowledge covers an output curve variability of an engine operating speed range. The second part of this contribution deals with the combustion product's temperature influence in an exhaust system for a maximum engine output and a range of exploitable speed. By increasing the combustion product's temperature in an exhaust system, the maximum engine output is reduced overall. There is the transfer of engine output to higher engine speed because the exhaust manifold length is short theoretically. That is why it is necessary to provide the optimum value of combustion products temperature in an exhaust system and so achieve maximum values of outgoing parameters.