What are the effects of excessive or insufficient ignition advance angle on the engine?

[Martin]

The effects of excessive or insufficient ignition advance angle on the engine are as follows: 1. Excessive ignition advance angle: The combustible mixture is ignited too early, and the expansion pressure generated by gas combustion will hinder the upward movement of the piston, resulting in reduced engine power, increased fuel consumption, poor idle speed, and sometimes even causing the crankshaft to reverse or break. 2. Insufficient ignition advance angle: It also leads to a decrease in engine power and an increase in fuel consumption. Because the combustion of the mixture is delayed until the working volume of the cylinder rapidly increases, the maximum pressure generated by the combustion gas is weakened, the thermal energy of combustion cannot be fully utilized, more heat is transferred to the cooling water, and the engine will overheat. As a result, phenomena such as backfiring in the exhaust pipe and backfire in the engine intake port often occur.