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Engine performance is strongly dependent on gas dynamic phenomena in intake and exhaustsystems. Careful design of the manifolds enables the engineer to manipulate the characteristics. The basicexhaust tuning mechanisms was described w ith respect to a two-stroke single-cylinder engine. Tuned adjustableexhaust pipe for use on two-stroke motorcycle was designed and tested. The dynamometer used incorporateda flywheel of appropriate moment of inertia to simulate the mass of the motorcycle and rider. The test procedureinvolved measurement of the flywheel speed during an acceleration phase resulting from opening the throttle.Calculation of the instantaneous flywheel acceleration gave a measure of the torque and power characteristics.The airflow based values of delivery ratio; trapping efficiency and charging efficiency were not measureddirectly but were culled from the fuel flow values and the Spindt computation of the exhaust gas analysis.Experimental test results were presented for powe.
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