Disregarding his talk about transmissions, the chart that he shows depicts that developed torque varies with engine rpm,
therefore Engine "A" will develop peak hp at one rpm and peak torque at another rpm,
while Engine "B" of a different design will develop peak hp and torque at completely different rpms.
So using the example you mentioned above, I would estimate that the peak hp (15) was developed at 3600 rpm while the peak torque (27.3) was developed at 3113 rpm.
Going back to the "umph" of the older cubs, my guess is that the older engine design developed the same amount of torque at lower rpm thus giving it the "feel" of power, much like diesel engine vs. gas engine.
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