What is the general maximum idle speed of an engine?

1 Answers
Palacios
07/30/25 1:10am
Engine idle speed limit is generally 5000 RPM. Internal combustion engines have a normal operating RPM range: Typically for small cars with 1.5~3.0L displacement, the RPM ranges between 1500~3000, with the most common being around 2000 RPM. Ordinary engines reaching 5000 RPM is basically the limit, while high-performance engines can reach 7,000 to 8,000 RPM. Premium models feature idle protection: Generally, higher-end vehicles are equipped with idle protection function. When pressing the accelerator during idle, the engine RPM won't increase - this is the engine protection feature of the vehicle.
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