Originally Posted by swamp2
The reason you should care about hp/l is not for the performance it gives you in your car but because it is a challenge of extremely difficult engineering. It is simply doing more with less which is univerally valued in just about any endevour.
I've never been a big fan of making a problem artificially difficult by placing made up restrictions on how I was going to solve it.
I could talk about the challenge of typing this email with only my big toe, but why? If making the displacement one L larger gives better results in terms of hp/lbs, powerband, or specific fuel consumption, then not doing that is a mistake.