Quote:
Interestingly enough, given the original premise of 40% over-square design (stroke = 60% of bore), the 1/3 scale displacement still remains at 133 CC.

Well, yes. Any volume measured on a 1/3 linear-scale model of anything will be 1/27 of what it is on the original. Even on the 1-cylinder Ferrari lawnmower engine in your figures.

Peter