Quote Originally Posted by hemmjo View Post
Yes, the pistons where larger than they are in today's engines, but those old engines also had very LONG stroke, which allowed them to make lots of torque at low RPM.

Also remember when you double the bore, keeping the same stroke, you quadruple the displacement. So a small increase in bore along with a longer stroke, gives the large displacement.
Yes, long stroke = loads of torque. And a hourglass instead of a tachometer.