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What is the RPM at 120 km/h?

2 Answers

Leanne

09/04/25 3:44am

At a speed of 120 kilometers per hour, the engine RPM for most cars ranges between 1800 and 3500. The RPM is also related to the car's displacement and the gear position of the transmission. Generally, a larger displacement results in relatively lower RPM. The relationship between car speed and RPM: The speed of the car is mainly determined by the engine RPM and the transmission ratio. If the difference in tire diameter is considered, then the tire must also be factored in. This can be expressed by the formula: Speed = RPM × Transmission Ratio × Tire Circumference. Reasons for the inconsistency between car speed and RPM: Due to the presence of the transmission, which consists of multiple gears with varying tooth counts and sizes, if a small gear drives a large gear, the overall RPM decreases, and vice versa. This principle enables gear shifting in cars. Some cars use continuously variable transmissions (CVT), where the gear diameter changes continuously, allowing for different speeds at the same engine RPM depending on the gear. A faster car speed necessarily means a higher engine RPM, but a higher engine RPM does not always mean a faster car speed. For example, when in a low gear, pressing the accelerator may not significantly increase the speed, indicating that car speed and engine RPM are not directly related.

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VanLayla

09/16/25 4:52am

At 120 km/h, the engine RPM actually varies depending on the car you're driving. From my personal driving experience, when I used to drive a manual transmission car with a small 1.5L engine at 120 km/h on the highway, the tachometer would jump above 3,000 RPM, roaring so loudly it made my ears numb. Later, I switched to an automatic SUV with a 2.0L engine, and at the same speed, the RPM stayed around 2,000, keeping the cabin quiet. This all relates to gear selection and transmission design – manual transmissions tend to run at higher RPMs with more noise if stuck in lower gears or if the car is older. Automatic transmissions are generally smarter, using higher gears to keep RPMs low during cruising. You can monitor your tachometer on the road – if the RPMs are too high, it indicates poor drivetrain efficiency, leading to higher fuel consumption and noise. Changing cars or maintaining your current one better can help. But don't worry too much – most modern cars can keep RPMs between 2,000 and 3,500 at highway speeds.

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