– Why can V6 engines not just get “smaller” for fuel efficiency vs going Turbo V4?

Question

I guess what about having extra pistons makes mpg worse vs. 1.8L, 2.5L, 3.5L, etc.?

In: 168

Answer 1

Smaller pistons = more friction per CC.

Same with any 3d shape.

You also have 50% more con rods, 50% longer crankshaft and cam shafts, 50% more valves, etc.

It’s a lot of extra friction and rotating mass that doesn’t gain you anything.