Morse Test

The Morse Test is performed to find the power developed in each cylinder in a multi cylinder internal combustion engine. It basically gives the relationship between indicated power and brake power. It is assumed that friction and pumping losses do not change and remains same when the cylinder is in firing condition as well as in inoperative condition. Using this test frictional losses in the ic engine can be easily calculated . It is a simple approach to find the mechanical efficiency of the engine. first power developed by all the cylinders is determined experimentally. Then using the power supply cut off to the spark plug of cylinder, power developed by individual cylinders are determined. then for the remaining cylinders, power developed by engine is determined experimentally and obtained value is subtracted from the first value and this gives power developed in the cylinder whose spark plug was cut off. in the similar fashion, this test is performed on all the cylinders of the engine individually. The following relation is used in Morse test ; Indicated power = friction power + brake power