PEEPER on Instagram: "This simple demonstration shows the core principle behind how a diesel engine works. Unlike gasoline engines, diesel engines don’t use spark plugs. Instead, air is compressed inside the cylinder until it becomes extremely hot. When diesel fuel is injected into that high-pressure, high-temperature air, it ignites on its own, pushing the piston downward and producing power. The model simplifies the process by focusing on compression and pressure rather than fuel injection tim