What is the normal engine speed?

[Jack]

For a normal vehicle, the engine speed generally ranges between 1000 and 3500 rpm. Below are the specific details about engine speed: 1. During cold start, if the idle speed is below 800 rpm or above 1200 rpm, it indicates poor engine condition. 2. While driving, try to avoid letting the engine operate below 2000 rpm. If the speed is too low, the engine will lack power, and the excessive load at low speeds can damage the engine and easily lead to carbon buildup. 3. When the engine operates above 4000 rpm, the combustion time shortens, leading to incomplete fuel combustion, which significantly increases fuel consumption. Using fifth gear at normal driving speed can reach about 150 km/h, which is a relatively dangerous speed. 4. The most economical and optimal engine performance occurs between 2200 and 3500 rpm. It is advisable to maintain the engine speed within this range during regular use.