The dynamic performance of engine can be improved by supplying gas intake in the course of intake. Dynamic performances in inlet pipe were analyzed theoretically in engine. Structural parameters of inlet pipes and resonator were calculated and validated in single-cylinder motorcycle engine. Results showed that, in a certain velocity interval, resonance of gas intake can improve the maximum power and torque of motorcycle engine about 6 to 8 percent, and with the changes of resonator’s cubage, the power and torque of engine are changed regularly. It can be concluded that in a certain velocity interval, resonance of gas intake can improve the dynamic performance of single-cylinder engine.
