“Big-bore” engines have large-diameter pistons combined with short strokes. These long-stroke engines generate more torque but have worse HP to cc ratios. The smaller the cylinder bore, the longer stroke the engine has. The bore and stroke of the engine are no less important. There are also many important factors like engine materials, design, tolerances, and compression ratio that significantly affect the HP per cc ratio. Supercharged and turbocharged engines burn much more fuel, delivering more power than naturally-aspirated power sources. The general rule is that the more cylinder the engine has, the more power it can deliver.Įngine aspiration also has a major effect on performance. Liquid-cooled engines are also more efficient than their air-cooled brothers, so they crank out more HP with the same displacement.Īnother key factor is the number and the dimensions of the cylinders. 2-strokes usually have a better cc/HP ratio than 4-strokes due to their design. One of the most important factors is the type of engine. Materials, tolerances, and compression ratio.Numbers and dimensions of the cylinders.Many different factors affect an engine’s cc/HP ratio, but the major ones are as follows:
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