What is the working principle of a naturally aspirated engine?

[SanElena]

The working principle of a naturally aspirated engine is that it does not have a supercharger. Air simply passes through the air filter, throttle valve, and intake manifold to reach the cylinders. Gasoline is directly injected into the intake manifold via the fuel injector. Engines include internal combustion engines, external combustion engines, electric motors, etc. For example, an internal combustion engine converts chemical energy into mechanical energy. The term engine can refer to both the power-generating device and the entire machine including the power unit. In a naturally aspirated engine, the air-fuel mixture is drawn in during the first stroke by a naturally formed pressure difference. In contrast, a supercharged engine compresses the gas first to increase its pressure and density. When the valve opens, the pressure difference and the high pressure of the gas itself increase the intake volume, thereby enhancing power output and converting other forms of energy into mechanical energy.