Morse Test Essay

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Morse Test The i.p. and the mechanical efficiency of a multi-cylinder auto engine is found out in a very short time by this test. During the test the engine is run at a constant speed and at same throttle opening. First the b.p. of the engine with all cylinders operative is measured by means of dynamometer. Next, the b.p. of the engine is measured with each cylinder rendered inoperative one by one by shorting the spark plug in case of petrol engine or by cutting off the fuel supply in case of diesel engine. When any cylinder is rendered inoperative, the speed abruptly goes down. Before taking any reading, the initial speed must be restored by adjusting the load. It is assumed that the f.p. of the inoperative cylinder remains the same as it were when the cylinder was operative. Considering the case of a 4-cylinder engine, |[pic] | When cylinder No.l is rendered inoperative, it does not develop any power; on the contrary |[pic] | some power is lost due to movement of piston inside the cylinder. Then, [pic] When the Morse test is carried out: (i) The b.p. should be measured as soon as possible after making cylinder inoperative. (ii) The dynamometer load should be adjusted soon to bring the speed to its constant value for the test; otherwise the engine may race. In order to plot i.p., b.p. and r\m a series of tests should be conducted at predetermined engine speeds because b.p. varies with load and

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