I wouldnt bash on him for asking a stupid question (weve all asked those kinds) but being around cars, he should know by now that theres very limited options for small displacement without positive displacment added on from a vaccum 
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"Ah! What music! They could have never imagined, those pioneers who invented the automobile, that it would posses us like this, our imaginations, our dreams. Men love women, but even more than that, men love CARS!"-Lord Hesketh
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