What is the normal engine starting speed?
2 Answers
Engine starting speed is appropriate at around 1200 to 1500 revolutions per minute (RPM). RPM refers to the number of times an object moving in a circular path rotates around the center of the circle per unit of time. Its functions include: 1. Timely reflecting the operating condition of the engine; 2. Allowing the driver to better coordinate with the transmission gear and throttle position; 3. Maintaining the car in a good working state; 4. Reducing consumption and extending the engine's lifespan. The significance of engine speed is: the level of engine speed relates to the number of work cycles per unit time or the size of the engine's effective power, meaning the engine's effective power changes with different speeds. The car's tachometer is located on the instrument panel, symmetrically placed with the speedometer.
I remember when I started my car, the tachometer would immediately jump to around 1200 RPM, especially when the engine was cold, like the first start in the morning. After a short while, it would gradually drop and stabilize between 800 to 1000 RPM, and the engine sound would become much quieter. This is because the engine needs to warm up and lubricate quickly after starting. A higher RPM may consume a bit more fuel temporarily, but it's fine for a short period. If it's too low, say below 700 RPM, the car might shake violently or even stall—I’ve experienced unstable idling due to carbon buildup. Maintaining a normal RPM not only saves fuel but also extends the engine’s lifespan. In summer, a hot start might directly settle at 900 RPM, unlike the higher RPM in winter. I recommend not ignoring the idle state—get into the habit of listening to the engine sound and fix any issues promptly.
