Ignition system for model ic engines1/27/2024 ![]() ![]() Lowering temperatures helps reduce the formation of nitrogen oxides (NOx), which are a regulated pollutant. For instance, by retarding the spark timing (moving the spark closer to the top of the compression stroke), maximum cylinder pressures and temperatures can be reduced. Other goals, like minimizing emissions, take priority when maximum power is not required. This is called spark advance: The faster the engine speed, the more advance is required. This means that the faster the engine goes, the earlier the spark has to occur. But the speed of the pistons increases as the engine speed increases. The time that the fuel takes to burn is roughly constant. The timing of the spark is important, and the timing can either be advanced or retarded depending on conditions. And because the length of the stroke and the area of the piston are fixed, the only way to maximize work is by increasing pressure. So when we're talking about a cylinder, work = pressure× piston area× stroke length. ![]()
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