The writer's meaning of 'efficient' was power per unit displacement.
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The F1 organizers know this and have limited output by limiting the number of cylinders.
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No. In the 3.5L era ('89 to '96), there were no rules limiting the number of cylinders.
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There is an SAE paper on this subject, it shows an increasing output (hp/l) for multicylinder engines as cylinder size drops from 400 cc to below 50 cc.
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Where can I find this?