During normal driving, when the car speed reaches 120 mph, the engine speed is mostly between 2000 rpm and 3000 rpm. Assuming the clutch plate is functioning normally without slipping, a manual transmission car requires shifting to the corresponding gear at certain speeds for proper operation. Under normal driving conditions, the highest gear engine speeds are as follows: When the speed reaches 100 km/h, the engine speed is generally around 2800 rpm; when the speed reaches 110 km/h, the engine speed is typically around 3200 rpm. Engine speed is a physical quantity representing the ratio of the number of rotations to time, commonly expressed in engineering as speed = number of rotations / time. It is an important parameter describing the rotational motion of an object. Factors determining engine speed: Transmission ratio: The same vehicle speed can result in different engine speeds, depending on the vehicle's transmission ratio. With a higher transmission ratio, the engine needs to rotate many times to drive the wheels for one complete rotation. Gear: The engine's power is not directly used as the driving force for the car wheels; the power needs to be processed through the gearbox. This is a key reason why shifting gears is necessary when driving. Different gears matched with different speeds allow the engine to avoid excessively high speeds, thereby reducing fuel consumption and achieving the goal of saving driving costs.
