ROMANCE all we like about grunty V8s, creamy-smooth straight sixes or punch-above-their-weight fours, the primary purpose of all internal combustion engines is as mundane as simply pumping air. Without air, and its key constituent oxygen, you can’t combust either petrol or diesel. And without combustion you can’t convert the potential energy in petrol or diesel in to mechanical energy to propel your vehicle. It’s as simple as that.
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