A larger displacement *generally* leads to a higher potential horsepower output, but many other factors influence the actual horsepower produced:
* Engine design: The efficiency of the engine design significantly impacts horsepower. A well-designed smaller engine can produce more horsepower than a poorly designed larger engine.
* Compression ratio: Higher compression ratios generally lead to more power.
* Fuel efficiency: The type of fuel used and how efficiently it's burned affects horsepower.
* Supercharging/Turbocharging: Forced induction significantly increases horsepower for a given displacement.
* Valvetrain design: More advanced valvetrain systems can improve power output.
* RPM: Horsepower is measured at a specific engine speed (RPM). A larger engine may produce more peak horsepower, but at a different RPM than a smaller engine.
Therefore, while a larger cc engine *tends* to have more horsepower, you can't directly convert cc to hp. Two engines with the same cc can have drastically different horsepower ratings due to differences in design and other factors listed above.
