The present manuscript highlights the work carried out in order to research and modify the design of engine of an utilitarian powered two-wheeler (PTW). (The term "utilitarian" used hereafter means a vehicle of a very simple and low-cost design applied as transport means exclusively which requires minimum maintenance or service costs). The task of modifying the design is constrained in the manuscript to the problems of fuel consumption and emission decrease in two-stroke combustion engine with 125 cc displacement. The following result of combined measures taken to modify the air-fuel mixture feeding system and gas exchange in the engine, equipping it with the system of air pressure flattening in carburettor float chamber (system is protected by the inventor's Certificate of the USSR) and the system of air-fuel mixture separating reduction of specific fuel consumption by 23 to 31% within the working range of engine speed was registered. Vehicle fuel consumption was considerably decreased, influence of filtering element contamination on PTW operational data was decreased as minimum as possible. An utmost simplicity and originality of technical solutions offered, minimum costs spent to introduce them in existing PTW designs predetermine the application nature of the accomplished research work and value of the work in practice.
Abstract