How do you convert 40 hp to cc?

To convert horsepower (hp) to cubic centimeters (cc), you need to know the specific engine efficiency and type, as there isn't a direct conversion since they measure different things. However, a rough estimate often used is that 1 hp is roughly equivalent to about 15 cc in a gasoline engine. Therefore, to convert 40 hp to cc, you would multiply 40 by 15, resulting in approximately 600 cc. Keep in mind that this is a general approximation and actual values can vary based on the engine design.