Example. Design a plain carbon steel Centre crankshaft for a single acting four stroke single cylinder engine for the following data: Bore = 400 mm; Stroke = 600 mm; Engine speed = 200 rp.m.; Mean effective pressure = 0.5 N/mm²; Maximum combustion pressure = 2.5 N/mm²; Weight of flywheel used as a pulley = 50 kN; Total belt pull = 6.5 kN. When the crank has turned through 35° from the top dead centre, the pressure on the piston is IN/mm² and the torque on the crank is maximum. The ratio of the connecting rod length to the crank radius is 5. Assume any other data required for the design.

Calculate the indicated power of a cylinder and the engine, if the mechanical efficiency of the engine is given as 75 % Calculate the brake power and friction power of the engine. Provide your answer in kW and hp. Study the power if the engine is a four stroke type. Cylinder bore 500 Piston stroke 2,050 Stroke/bore ratio Speed range Mean effective pressure = 2050/500 124-99 19.5 Maximum cylinder pressure Numbers of cylinders 5 to 8 Feedback: Correct answer = 155 mm mm rev/min bar bar