I know a guy like the OP. He busies himself pondering things like this.
He once wanted to discuss the subject of sprinklers and how a model with a finer spray pattern may be detrimental due to the water droplets being so small, they might be lost to evaporation rather than watering the lawn.
Bring a subject like this up to a woman and you'll get a look like this:
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In short, an engine is like an air pump. The more air that goes in, the more power that it can potentially make.
A 426 Hemi makes about 423 more HP than a Briggs and Stratton lawnmower because it moves a tremendous amount of air by comparison.