As saying among people who know internal combustion engines. To have an engine produce more power, you have to get it to burn more fuel/air mixture in a given amount of time. The easiest way to do this is to simply have more displacement, more space to hold the mixture. Now, it's possible to bungle even a motor with a lot of displacement (normally measured in cubic centimeters nowadays), like, say, a 1200cc Harley, can be enfeebled if one really goes out of one's way to do so.

However, in modern engine design, there simply is no substitute for size. You can add turbocharchers, more valves, better cam configurations (allowing for more RPMs), better fuel, lighter components, whatever you can think of. But bigger is better.

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