What is a common consequence of prolonged pre-ignition in an aircraft engine?

Prolonged pre-ignition in an aircraft engine can lead to engine knocking and potential damage because pre-ignition occurs when the air-fuel mixture ignites prematurely, before the spark plug fires. This premature ignition can create uncontrolled combustion events within the engine cylinder that generate excessive pressure and heat. As a result, this can result in increased engine knocking, which is a form of abnormal combustion characterized by a sharp knocking or pinging sound. This can ultimately lead to serious engine damage, including piston scoring, burned valves, and even complete engine failure if not addressed promptly.

The other options are less relevant in the context of pre-ignition. Improved fuel efficiency, enhanced throttle response, and reduced fuel consumption do not occur as consequences of this issue; instead, they often become more compromised as the engine experiences the detrimental effects of pre-ignition.