* Advanced Timing: If the ignition timing is too advanced (spark plug fires too early), it causes the engine to work harder. This increased combustion pressure generates more heat, leading to higher engine temperatures. The extra heat can overwhelm the cooling system's capacity.
* Retarded Timing: While less common to cause overheating, significantly retarded timing (spark plug fires too late) can also lead to overheating. Incomplete combustion produces less power and more unburned fuel. This unburned fuel can increase the exhaust gas temperature, and over time, could contribute to overheating.
In short, optimal ignition timing is crucial for efficient combustion. Deviation from this optimal point, in either direction, can disrupt the delicate balance of the engine's operation and lead to increased heat generation, potentially resulting in overheating.
