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Most average-capacity combustion engines (in vehicles) idle at between 1,000 and 2,000rpm. Red-line rev' counts commonly range between 7,000 and 9,000rpm and hazard-level counts between 9,000 and 14,000rpm depending on the vehicle. Motorcycle engines of comparable capacities usually idle faster (1,200 - 3,000rpm) than car engines and are capable of higher safe rev-counts (8,000 - 14,000rpm) Compression (Diesel) engines generally run slower (800 - 1,500rpm) than combustion (Petrol) engines and have far lower top-rev counts (4,500 - 7,500) but produce a greater torque output. Consult an owners handbook or workshop manual for the exact recommended idle speed of your specific engine.

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16y ago

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