Why Do Four-Cylinder Cars with the Same Displacement Have Different Horsepower?

[Emil]

Four-cylinder cars with the same engine displacement can have different horsepower outputs due to the two different operating conditions: naturally aspirated and turbocharged. Main Function of Turbocharging: Turbocharging increases the engine's air intake, thereby enhancing the engine's power and torque, making the car more dynamic. Horsepower with Turbocharging: When a turbocharger is installed on an engine, its maximum power can be 40% or more higher than without the turbocharger. This means the same engine can output significantly more power after being turbocharged. Taking the most common 1.8T turbocharged engine as an example, after turbocharging, its power can match that of a 2.4L engine while still maintaining a 1.8-liter displacement. In this scenario, the engine's horsepower is much higher than that of a naturally aspirated 1.8-liter engine.