Knocking

{
  "id": "MLC-T-IND-003205",
  "term": "Knocking",
  "field": "Industrial and trades",
  "definition": "The audible metallic sound produced by an engine when abnormal combustion occurs, specifically when the air-fuel mixture ignites spontaneously before the spark plug fires. This uncontrolled combustion creates pressure waves that impact engine components, potentially leading to damage. It is often a symptom of incorrect fuel octane or advanced ignition timing.",
  "subject": "Automotive",
  "translations": {
    "de": "Klopfgeräusch",
    "es": "cascabeleo",
    "fr": "cognement"
  },
  "url": "https://mlchart.com/terminology/industrial/knocking/"
}