Pre-ignition

Definition of Pre-ignition

Pre-ignition refers to the early ignition of the air-fuel mixture in a reciprocating engine cylinder, which occurs before the normal ignition spark takes place. This phenomenon can result in serious engine damage, including melted pistons and cylinder heads. Pre-ignition is caused by a hot spot in the combustion chamber, such as a piece of carbon or a spark plug that is too hot, which ignites the fuel before it is intended to. It can also occur due to a high engine temperature, incorrect fuel octane rating, or incorrect ignition timing. Pre-ignition should be avoided as much as possible to maintain engine health and prevent expensive repairs.