how to use tachometer to measure rpm

• 2022-05-25

In front of the driver's seat side of each car, there are two important instruments: engine tachometer and vehicle running speed meter. These two gauges are closely related to the running condition of the vehicle engine and the driving condition of the vehicle, which is the basic knowledge that every driver should master.

First, use the tachometer to judge whether the car starts. Nowadays, the noise of automobile engines is very low, almost at zero decibels. Sometimes in a slightly noisy environment, it is difficult for us to judge whether the engine has been started through the sound. Some novices will make a misjudgment and may start the engine again, causing damage to the automobile motor. The correct way is to observe the tachometer of the car. When the car is not running, if it is in the idle state, the pointer of the tachometer will indicate the position of more than 700 revolutions. If the car has not been started, the pointer will point to the zero scale.

Second, judge the timing of manual shift. Some novices often turn off the vehicle when driving a manual transmission car, which is that they don't grasp the timing of gear shifting. When use tachometer to measure the rpm , the correct way is to slowly release the clutch and start in the first gear when the engine speed is less than 1000 rpm. When the engine speed is between 1000-2000 rpm, shift to the second gear for driving. When the engine speed is between 2000-3000 rpm, shift to the third gear for driving. When the engine speed is between 3000-4000 rpm, shift to the fourth gear for driving. When the engine speed is between 4000-5000 rpm, When driving in fifth gear, if the speed is low and the gear is high, the engine will shut down. If the speed is high and the gear is low, the engine will make a huge roar.

Third, display the safe working area of the engine. The automobile tachometer displays the rotation speed of the engine from low to high according to the clockwise rotation direction.If the pointer points to the red marked part on the tachometer, it means that your automobile engine has been running at high speed, reaching more than 6000 revolutions. Excessive rotation speed for a long time will cause some problem to the engine.

Correctly use the engine tachometer to protect our car and ourselves.