Why Does the Engine Overheat?

[LaAnastasia]

The engine overheats when operating at high power or under overload for extended periods. For example, prolonged driving in low gear or on poor road conditions, extended high-speed driving in high-temperature environments, or prolonged high-speed idling. Specific causes: Incorrect fuel mixture ratio. If there is insufficient engine oil in the gasoline, the moving parts will not receive adequate lubrication, worsening working conditions and increasing friction-generated heat, leading to engine overheating. Using gasoline with too low an octane rating or stale, degraded gasoline can cause engine knocking, raising the operating temperature and resulting in overheating. Overly lean or rich air-fuel mixture, or incorrect ignition timing. A lean mixture slows flame propagation, prolonging combustion and increasing cylinder temperature. A rich mixture leads to incomplete combustion, knocking, and carbon buildup, also raising cylinder temperature. If ignition timing is too retarded, combustion time extends, increasing exhaust temperature. Clutch slippage, where the engine runs at high speed but the vehicle does not accelerate proportionally, significantly reduces natural air cooling capacity, causing engine overheating. A clogged muffler due to carbon buildup increases exhaust backpressure, raising engine workload and leading to overheating.