Resisting torques at different sections.
Based on this consideration and the firing order, the cylinder
#3 would lag by 90 degrees from the absolute cam pulley
rotation. Further, cylinder #4 and cylinder #2 would lag by 180 degrees and 270 degrees of the absolute cam pulley
rotation respectively. Considering this the torque variation at
various sections on the camshafts was calculated including
the resultant torque variation being observed on the cam
pulley (as a result of resisting torque induced in each of the
cam lobe). The sections considered for calculation of
resisting torque variation are as shown in Figure 9.