Potential answers for "Good noise from an engine"

⭐⭐⭐⭐ HUM
⭐⭐⭐ PING
⭐⭐⭐ CHUG
⭐⭐⭐ KNOCK
⭐⭐⭐ VROOM
⭐⭐⭐ ROAR
⭐⭐⭐ PURR
⭐⭐⭐ RATTLE

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