Quote Originally Posted by pl4yboy View Post
.7L of displacement vs 1.3L. Like zebra said. Like a 4.3 to a 6.0.
Or think of it this way.......

The old 3.8 V6 from Olds/Buick cars is almost the same as a 5.0 V8 with 2 fewer cylinders.

3.8 = .6333333 L per cylinder
5.0 = .625 L per cylinder

So, if you can imagine the difference between those 2 motors, that's roughly the difference an extra 1.2L makes. Not exactly, mind you, just a point for comparison.

The 1.2L difference in going from a V6 to a V8 in my comparison would actually be a bit less dramatic than a 1.2L larger V8......because in the V6 to V8 scenario, part of the HP increase will also be absorbed by the larger rotating mass of the extra 2 cylinders. You will probably add rotating mass with a larger V8 as well (larger pistons), but not as much as 2 whole extra cylinders' worth. One way to get around, or at least somewhat mitigate the increased rotating mass issue is to use lightweight forged pistons in the larger motor. That of course requires rebalancing of the whole rotating assembly, yadda yadda yadda.