ノッキング

noun, noun or participle which takes 'suru', intransitive verb

engine knocking; knock

Refers to the abnormal combustion noise in an internal combustion engine, also called detonation or pinging. Used as a noun or with する to describe the occurrence of knocking.

• エンジンがノッキングを起おこしている。

  The engine is knocking.

• 低ていオクタン価かのガソリンを使つかうとノッキングしやすくなる。

  Using low-octane gasoline makes knocking more likely.