What could improper ignition timing potentially cause in an aircraft engine?

Improper ignition timing in an aircraft engine can lead to preignition, which is when the fuel-air mixture ignites before the spark plug fires. This can occur if the ignition timing is set too early in the compression cycle, causing the fuel to ignite while the piston is still moving upward. As a result, the combustion pressure builds up prematurely, leading to a combination of effects that can harm the engine.

Preignition can cause severe knocking or pinging sounds due to the uncontrolled combustion, which ultimately results in increased thermal and mechanical stress on engine components. This phenomenon can lead to engine knocking, reduced efficiency, and potential engine damage or failure over time. Therefore, maintaining correct ignition timing is critical to ensure smooth engine operation and to avoid the damaging effects of preignition.