| Answer | Crossword Clue |
|---|---|
| PINGS | Knocking engine sounds |
| knockless | of an engine, bearing or fuel, producing no knocking sound |
| detonations | The premature combustion of fuel in an internal combustion engine, causing knocking |
| detonation | The premature combustion of fuel in an internal combustion engine, causing knocking |
| RAPS | Knocking sounds |
| CLACKS | Knocking sounds |
| ratatats | a rapid succession of knocking, tapping, or cracking sounds |
| ratatat | a rapid succession of knocking, tapping, or cracking sounds |
