The Willan’s line measured for a four stroke, four-cylinder is expressed as:
FC = 0.15 + 0.03 ´ B.P., where FC is the rate of fuel consumption in gm/s and B.P. is the brake power in kW. The bore of each cylinder is 75 mm and stroke is 90 mm and the speed is 3000 rpm.
Calculate indicated power, mechanical efficiency and indicated mean effective pressure, when the engine is developing a brake power of 20 kW.