The cylinders fire sequentially according to the firing order 1-2-4-3.
i Draw the cyclic variation of the total crankshaft torque for the engine (i.e. total
crankshaft torque vs

) at 3000 rpm. Also indicate the mean value of this torque
on your diagram.
[7 marks]
2
ii. Hence, find the moment of inertia of the flywheel necessary to keep the engine
speed fluctuation within
 0.1%
of the mean speed, under a constant resisting
torque.