On the tuning pipe of a two-stroke engine for scooter-type motorcycles

Abstract

Abstract

Engine performance and simultaneous pressure wave histograms in the cylinder and exhaust port were studied in this experiment. The performance of two-stroke engines for scooter-type motorcycles depended greatly on the length and expansion angle of the tuning pipe. The length of the lead-in pipe dominated the phase of the starting point of reflected expansion waves. The full length determined the timing of reflected expansion waves. The first expansion angle of the exhaust pipe must be limited to a small value and then expanded gradually to give the desired diameter. The effect of the muffler was also discussed. There was an optimal distance between the end of the tuning pipe and the spacer of the muffler to obtain a maximum power output.