Department of Mechanical & Aerospace Engineering

Q.4	(a) (b) (c)
The BMW M6 has a V10 cylinder engine with each cylinder having a bore of 92mm and a stroke of 75mm. Calculate: The piston area; The cylinder and engine’s total displacement; If the cylinder has a compression ratio of 12:1 calculate the clearance volume and the total volume of the cylinder. (7 Marks) If the above engine has a Brake Mean Effective Pressure of 1167 kN/m^2 at 7750 rpm calculate: The break power being produced; The engine torque produced at 7750 rpm; The mean piston speed for the engine at peak power; and The specific power output. (10 Marks) If a 6 cylinder Porsche 911 Turbo having a cylinder bore of 100mm and stroke of 76.4mm produces 333 kW (450bhp) at 5700rpm, calculate: The specific power output; The mean piston speed; and When comparing the technical performance of the BMW M6 and Porsche 911 engines, which of these do you consider to be superior and why. The technical performance of BMW M6 is superior to that of Porsche 911 engine. The BMW has higher specific power output of compared to of Porche indicating it makes better of cylinder bore and thus engine size. The BMW has a faster mean piston speed as opposed to of the Porsche meaning more fuel mass i (8 Marks)

END OF ASSESSMENT

16263

Page of