These 4 car experiences, in fact, are rumors, how many do you believe?

Now that the Internet is very developed, we can easily get all kinds of useful information. Many car owners usually browse some content about car use and car maintenance. Logically, these contents can help us increase some car knowledge, which is a good thing. But in fact, some of the content is not rigorous, full of loopholes, not only does not help us use the car, but even misleads us. So today, we will find out some of the most common rumors and reveal the truth again in principle.

The steering wheel bottomed out and damaged the booster pump. It has long been said that when the steering wheel hits the end, the booster pump will not be able to hold its strength and will be easily damaged. Later, some people rumored that there was a pressure relief valve on the booster pump, and the pressure would automatically be released after the pressure exceeded the standard, so it was no problem to hit the end. In fact, these two statements are not correct, and the booster pump may not be able to hold its strength after hitting the direction to the end. In addition, the pressure reducing valve is a must-have for the hydraulic system, in order to prevent the system from being damaged by excessive pressure, just like a fuse must be in the car circuit. But when the pressure reducing valve really works, the system pressure is indeed higher, which may have little impact on the new car, but it is not impossible for the old car to suppress the pressure booster system tubing.

Many old cars can hear the abnormal sound of the assist pump belt, the muffled sound of the engine, and the hum of the oil pump after hitting the end, all of which are caused by high pressure. The root of the problem is that after the direction hits the end, do you let go of your hand or continue to exert force. The most ingenious design of the hydraulic power steering system is the steering gear. A metal rod is attached to the steering wheel, and when turned, the metal rod twists and deforms. This deformation drives the hydraulic valve to open and supply oil to the booster cylinder, so there is power. When we stop rotating, the metal rod will automatically recover, the hydraulic valve will close, the booster cylinder will run out of oil, and the booster pump will naturally not have to hold back. If you still push the steering wheel to the bottom, the booster pump will clog and the pressure reducing valve will start working. So, it's not scary to fight in the end. As long as you finally finish playing and let go in time, there is no problem. If you keep pulling the steering wheel until the end, the booster pump will definitely be unhappy.

The fuel tank is too full to hurt the car. Some people say that the fuel tank is too full, which will cause the pressure of the fuel tank to rise, which is very dangerous. It is recommended to add only 200 at a time. So the fuel tank designed by the manufacturer can only be used in half? Isn't that a great waste? In fact, the inside of the fuel tank has a clever self-sealing design. When the oil is added to the maximum scale, the ventilation pipe inside the tank will be blocked by the oil, and the air in the tank cannot be discharged smoothly, resulting in air resistance at the fuel filling port, causing the fuel gun to beat. So don't be afraid to add more oil every time, and jump when you get to the maximum amount. The real injury is that the gun will continue to be added after the jump, because this may cause gasoline to be poured into the carbon canister and waste gasoline. But there is some activated carbon in the carbon tank, which is wasted when soaked in gasoline, and it takes hundreds of pieces to change the carbon tank. Especially now, the structure of the tank evaporation control system is more complex, and if something goes wrong, the maintenance cost will be higher. So, remember, every time you refuel a jumping gun, don't force it. Automatic transmission neutral operation can burn out the transmission. Will an empty car burn out the automatic gear? I don't think manual gears burn out even automatics burn out in the same situation.

Because there is an oil pump in the automatic transmission, it mainly has two functions, one is to lubricate the transmission, and the other is to power the hydraulic unit of the transmission. The oil pump is directly connected to the engine. As long as the engine does not turn off, the oil pump will continue to supply fuel to the transmission. Such good lubrication conditions, why does it burn out? And the automatic gear also allows trailers, the trailer speed can not exceed 50km/h, the towing distance can not exceed 50km. It can still be manufactured without oil pump lubrication. Now there is an oil pump forced lubrication, and it is even more unlikely to burn out due to insufficient lubrication. In contrast, the manual transmission does not have a special oil pump for forced lubrication, and can only rely on the gear to stir the oil for splash lubrication. In some cases, it is indeed possible to burn out the transmission. In addition, for the CVT gearbox, the power between the tapered wheel and the engine after changing into neutral gear will be cut off, and the cone wheel group will be in an empty state during the entire coasting process, and the steel belt load will be smaller than when sliding with gear. Of course, we're not introducing these things to encourage you to drive in neutrals, but to enable you to look at them from a scientific point of view.

When the engine is hot, it cannot be stopped immediately, otherwise the heat inside the engine cannot be dissipated. This statement sounds very reasonable. After all, gasoline is constantly burning inside the engine, and the core temperature is definitely high. If the engine is immediately shut down at high temperatures, the coolant will stop circulating, and the heat of the engine core will not be dissipated, which will definitely lead to serious internal injuries. This is not the case at all. First of all, the temperature inside the engine is not as high as we think, because gasoline burns very fast, and part of the heat is converted into power. Most of the waste heat remains in the exhaust gas and is discharged from the exhaust pipe, so the heat actually transferred to the engine is actually very limited. If the heat burned is absorbed by the engine, then according to the calorific value of the gasoline, if you step on the accelerator for 2000 minutes, the engine will burn out on its own. So stop as soon as there is a high temperature. There is no need to worry about internal injuries to the engine. Its internal temperature is not as high as we thought.

In addition, the light of the water temperature warning light does not mean that the engine will burn out, because the current engine has a very accurate thermal management system. When the system detects that the water temperature exceeds the limited safety range, it will light the high temperature warning light as soon as possible, but in fact, the temperature at this time has not yet reached the point of damaging the engine. For example, the control logic of a model engine thermal management system is that the normal working temperature of the engine is between 87-95 degrees Celsius, and when the water temperature exceeds 95 degrees Celsius, the high temperature alarm light will be turned on. That is, when the engine water temperature is 95 degrees Celsius, there is no problem. When the water temperature reaches 96 degrees Celsius, the high temperature lamp will turn on. What damage do you think this 96-degree water temperature will do to the engine? On the contrary, it is most dangerous to listen to rumors and not turn off the engine, because the engine is already hot, indicating that there is a problem with the cooling system. Idling in place can only allow the engine water temperature to continue to rise, eventually damaging the engine.