what does the tachometer do

• 2022-01-05

Judge whether the vehicle starts. When the car is at idle speed, the pointer of the tachometer will not refer to 0, but about 800 revolutions. Earlier, when automatic transmission models were not so popular, the biggest use of tachometer was to remind us to shift gears. If the speed is too high, it will not only cause fuel consumption of the car, but also cause damage to engine parts. Therefore, we will also see that there will be a red line area on the tachometer to remind the driver. Of course, if you are an old driver and you are very skilled in driving, you can shift gears by listening to the sound, and the tachometer is naturally only an auxiliary function.

However, now all cars are automatic, and there is no need to shift gears manually, so why keep this tachometer? First of all, there must be hand-in-hand models. I won't say much about this. If it is purely automatic, its existence is also conducive to the repair master and driver to judge the vehicle condition. Experienced masters and owners can judge whether there is a problem with the vehicle through the idle speed of the vehicle and the movement state of the pointer. Moreover, for many old drivers, the tachometer will also bring some convenience, such as determining whether the car has started. According to the engine speed to determine the shift, look at the tachometer to determine the shift time, uphill or downhill, you can appropriately increase the speed before shifting. It is better to shift at the lowest speed while keeping the vehicle smooth. Indicates the safe operation area of the engine. There will be a red zone on the tachometer. Generally, the speed in the red zone will be more than 6000 rpm. For the engine, maintaining too high speed for a long time will cause poor lubrication performance of the engine, and the burden of the heat dissipation system is also relatively large.

Therefore, although the probability of using the tachometer is not as high as before, it is still necessary to observe the tachometer from time to time, which is also helpful to find the fault early. Check whether the car has problems. The engine tachometer can reflect many problems of the car. Judge whether the car has problems through the movement of the tachometer pointer when the engine is idling, such as carbon deposition, throttle, spark plug and ignition coil.