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In this research, a computer analysis has been developed for predicting the pipe pressure of the intake and exhaust manifold in a small single cylinder engine. To get the boundary conditions for a numerical analysis, one dimensional and unsteady gas dynamic calculation is performed by using the MOC(Method Of Characteristics). The main numerical parameters are engine revolutions. to calculate the pulsating flow which the intake and exhaust valves are working. The distributions of the exhaust pipe pressures were influenced strongly to the cylinder pressures, and the shapes of exhaust pressure variation were similar to the inside of cylinder pressure. As the engine revolutions are increased, the intake pressure was lower than ambient pressure. The amplitude of exhaust pressure had increased and the phase of cylinder pressure Pc is delayed and the amplitude of cylinder pressure were increased.

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Abstract
Nomenclature
1. Introduction
2. The method of numerical solution and model
3. Results and discussions
5. Conclusion
Acknowledgements
References

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UCI(KEPA) : I410-ECN-0101-2009-559-013743089