Experts who know about automobile engines tell me if the engine idling at 5 rpm is harmful to the car.

Experts who know about automobile engines tell me, is the engine idling at 5 rpm harmful to the car?

From the mechanical point of view and design expectation, idling for 5, revolutions is no problem, even if it lasts for a period of time; However, in fact, some vehicles are worn and destroyed due to high speed, so this problem cannot be across the board; Some old vehicles are really unbearable to give a foot five thousand turns. But this is extremely rare, just like the number of on-line inspections is as high as 1 million every year, but the problems are only a few cases, and the probability is even lower than the probability of engine damage when using a car! So you can't tax it. idling 5 thousand must be harmful!

from the mechanical point of view, the engine is not afraid of continuous high speed operation, but is afraid of high and low speed, which is the most likely working condition to cause engine damage; However, it is not harmful to keep running at a certain speed! What the engine is afraid of is the constant change and circulation of the material temperature, that is, because of the above-mentioned high and low rotation speed, this working condition is easy to make the material temperature rise and fall; To put it simply, even people who are suddenly cold and hot can't stand it, right? But people are often more resistant to persistent high temperature and persistent low temperature! Therefore, the single high speed working condition is not terrible, but the terrible thing is that it will be low speed for a while and high speed for a while, which will hurt the engine the most!

diesel vehicles with multi-axle drive and overweight will use the free acceleration detection method, and step on the accelerator for about 4, revolutions for 2 to 4 seconds each time, but this is the detection method for a few vehicles, not for most vehicles.

also, after the car is tested, there will be a fault light, because there is a vehicle protection system, so the speed can't be increased on the dynamometer drum, and it can't exceed 2 yards. However, when the car needs to run to 25 yards and 4 yards, the protection systems such as sideslip will be turned off. In addition, the driving wheel runs on the roller, rather than the driving wheel is stationary, which will affect the sensor to sense the corresponding speed signal, and the driving computer can't obtain data, so there will be fault lights, most of which are hand brake, Abd abd,esp.

so don't say 5 rpm when you see the test, which is misleading. You can popularize your knowledge yourself.