Why Can a Manual Transmission Car Move Without Applying the Throttle?
2 Answers
Manual transmission cars have an idle phase, during which they can move at idle speed without pressing the throttle or the brake. This action is commonly referred to as automatic transmission creep start, and the vehicle will not stall regardless of the speed at which the brake is released during startup. Below are the benefits of manual transmission cars: 1. First, manual transmission versions of the same car model are cheaper than their automatic counterparts, offering better value. 2. Manual transmissions are more mature in technology, highly reliable, and have lower maintenance and repair costs compared to automatic transmissions. 3. Due to the complete absence of electronic assistance, the purely mechanical structure results in a significantly lower failure rate.
A manual transmission car can move without pressing the accelerator primarily because the engine's idle state provides the necessary power. I've studied how engines work—idle speed is the preset minimum RPM that keeps the car running when stationary or at low speeds. When you depress the clutch, engage a gear, and gradually release the clutch, this idle torque transfers to the transmission, gently propelling the wheels forward. This is especially noticeable in first and second gears, and more easily achieved on flat roads or slight downhill slopes. Engineers designed this feature to simplify operations, such as allowing the car to creep forward in city traffic by lightly releasing the clutch without frequent throttle inputs, saving fuel and reducing driver fatigue. However, remember to use the brake on steep slopes to prevent rolling back or stalling. This mechanism relies on the clutch disc's precise engagement—mastering it enhances driving comfort.
