I was explaining the differences between engines to my friend the other day after she heard me say 2.0 liter, 5.7 liter, 6.0 liter......she asked what does the liter mean? What does the liter measure, and how when refering to engine size? All I know is that the bigger the liter the bigger the engine. I may know my cars but the internals of an engine I do not know. Can any of you help me out with this one?