Preignition
Preignition is a phenomenon that occurs in internal combustion engines, including those used in aviation, when the air/fuel mixture in the combustion chamber ignites before the spark plug fires. This can be caused by a hot spot in the combustion chamber, such as a spark plug tip that is too hot, or by a foreign object in the chamber that is hot enough to ignite the mixture. Preignition can cause engine damage, including piston and valve damage, and can lead to engine failure. It is important for pilots and mechanics to be aware of the signs of preignition, such as engine knocking or pinging, and to take appropriate action to prevent it.
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