tachometer on a watch

• 2022-02-18

What information we can read from the tachometer and how to use it depend on different groups of people.The vehicle driving control operation can be carried out through the basic engine speed information. For example, in daily driving, shift gears to make the engine run in a more efficient and low fuel consumption area (don't ask me if I should shift gears in 2000, the answer is that each car is different). Automatic models have been basically set up for you according to this, so as long as you drive smoothly; For another example, when starting a cold car, check whether the idle speed of the engine and the idle speed reduced to the manual to judge whether the engine has been completely hot. (in fact, you can walk in the car without waiting until the car is completely hot).

For household vehicles, the tachometer only serves as a reference, because ordinary people will not increase the speed to more than 3500 rpm during daily driving; And with the popularity of automatic transmission, fewer and fewer people pay attention to the speed of the engine. On the contrary, due to the restrictions of traffic rules, we naturally do not want to overspeed, so the speedometer is very important to most drivers. Therefore, most household cars generally have a tachometer of the same size as the speedometer, or mainly a speedometer, which is placed in the middle of the instrument panel.

However, speed is very important for racing. No one cares how fast you drive on the track; However, less 500 rpm upshifts or more 500 rpm upshifts, and the engine output falls off the torque platform will have a serious impact on the power. In fact, many racing vehicles simply cancel the speedometer, leaving only the tachometer. In short, the speed is the instrument that can best reflect the working state of the engine, the most important part of a car, so it must be and is very important.

For big guys like V6, the speed must be above 140. There's no tachometer. I don't know if there's a problem. And start. At the moment of starting the engine, the speed can often reach 1200-1500 revolutions per minute, which is higher in cold weather. Because the engine will shut down if the speed is too low, you can warm up the car as soon as possible only if it is higher. However, the speed should not be too high during cold start, because the lubricating oil can not reach the upper part of the engine at this time. In order to reduce wear, it is more appropriate to rotate within 2000 rpm. When the engine condition is stable, the speed will drop to 800. In other words, the speedometer is used to monitor the engine status in real time. For senior drivers, listening to the voice and looking at the watch can judge where the car has failed.