The oxygen concentration is measured with an Oxygen analyzer fitted between air box and inlet manifold of the engine. The test engine is coupled to Magtrol (model-4WB15)-eddy current dynamometer. The main measuring instruments used were; a mass balance with an accuracy of 0.01 g to measure the fuel flow rate, a bomb calorie meter to measure the calorific value of fuel, a thermocouple to measure the temperature of exhaust gas, inlet air, a TDC marker (a magnetic pickup) and an rpm indicator. A Kistler piezo electric transducer measures the combustion chamber pressure (it is a mean value of 50 consecutive cycles) with an increment of 1° crank angle using an AVL data acquisition system (AVL indicom compact). Exhaust gases were measured by HORIBA MEXA 548L five gas analyzer and gases are measured based on non-dispersive infrared principle. The Analyzer measures nitrogen oxides (NOx) with a resolution of 1 ppm, total unburned hydrocarbon (HC) also at a resolution of 1 ppm, and carbon monoxide (CO) with a resolution of 0.01%. An AVL smoke meter of model AVL 437C is used to measure the smoke opacity with a range of 0 to 99.99% of smoke opacity with the resolution of 0.01%.