How to deal with the engine water? Watching diaosi teach you how to deal with engine water intake.

After the heavy rain, the topic of cars began, especially in Weibo, where everyone offered suggestions, some taught you how to save yourself, and some taught you how to repair cars when they were soaked in water. Of course, the hottest and most controversial topic is engine water (in the middle of the article, how to save yourself becomes the first hot topic in Weibo). Who is right? This article can tell you how to repair the engine after it is flooded, which can save money (many of them need to pay at their own expense). In a word, what we said is true. ● The process of engine water intake On a rainy night, the driver Master Liu was driving in a low-lying section of Huancheng Road. He drives an SUV with four-wheel drive function. With his tall body, he conquered many fields that others used to be afraid of. This time, he is also full of confidence in the "river" in front of him, but Master Liu clearly knows that the situation in front of him is obviously different. Fortunately, he was calm enough, and the wading rule in his heart told him to keep driving in low gear and keep the accelerator steady. As more water is slowly pushed away by the front of the car, this deadly abyss has completely surrounded it. At this time, it is not easy to break free. After a short period of shaking, the vehicle lost power, but because the circuit was still connected, according to the feedback from the instrument, the lighted EPC warning light was accompanied by a series of buzzer alarms, making this flameout no different from an ordinary engine flameout fault. Master Liu subconsciously pressed the ignition switch. Under the street lamp, the sparkling "lake" and the rolling waves just reflected in Master Liu's eyes. All this failed to change Master Liu's mind. What happens when he presses the ignition switch? If I sit next to Master Liu, I will definitely stop him from doing so. Here, it must be clear that once your vehicle turns off after entering the water, don't try to ignite it again. Because you can't tell the reason why the car stalled. There are many possible reasons for the flameout after the vehicle enters the water: 1. When the engine is at low speed, the exhaust pressure is too high because the exhaust pipe is in water; 2. Wet air filter, insufficient air intake and flameout (water has not yet entered the manifold); 3. The engine can't work normally because of less/more water/damage and flameout. Because we are in a state of heavy rain or wading, we can't judge what caused the car to stall, so the most reliable way is to move the car to a safe place without thinking about any engine. If you insist on restarting the engine, then we need to continue to explain what may happen to you. At this time, you must have been psychologically prepared for the possible overhaul. After the engine suffocates in water (a large amount of water is injected into the cylinder), will it lead to the bending of the connecting rod and more serious consequences? The answer is no! When the vehicle is wading at a low speed, the engine will suffocate due to the influx of water into the cylinder. At this time, there is already water in the tank. According to conventional thinking, water is incompressible, which will definitely lead to the bending of the connecting rod and even the damage of the cylinder. Then why should I be more outspoken? Because in this case, the engine crankshaft may not turn at all! While the engine was suffocated by water, the cylinder was basically filled with water. Because water is incompressible, there is little room for the piston to rise. At this time, even if you turn on the ignition switch, the starter won't start at all, let alone damage the engine. Moreover, in this case, the engine often has caused irreversible internal injuries due to a large amount of water before the flameout, and your "secondary ignition" can't change this fact whether it is successful or not. How is the connecting rod bent? A small amount of water enters the cylinder, and the engine can be started "normally". Bian Xiao, a group buyer of Shiqi Automobile, said that in many cases, the owner did not know that the engine was flooded, but there was not much water (enough to meet the engine start). At the moment of start-up, a piston goes up to complete the compression work before ignition, and almost at the same time, the intake valve closes, so the inside of the cylinder becomes a sealed space. Because water is incompressible, when the piston goes up to a certain position, the resistance will increase obviously, but the crankshaft driven by other working pistons is determined to send this piston to the top dead center position. In short, the water will not give in, and the connecting rod will become much more fragile (slightly deformed). When starting, the accumulated water will be discharged from the cylinder with the opening of the exhaust valve, but the damage it causes to the connecting rod has become a fact, and the bent connecting rod invisibly reduces the compression ratio of the cylinder. And it increases the resistance of the engine running, so the vehicle will feel lack of energy when driving, and the driver may not know what is happening in the cylinder. From the driver's point of view, he will think that the power of the car is not enough, and he will deliberately step on the accelerator deeper and use higher speed to get the desired power. The slight bending of the connecting rod will make the operation of the piston in the cylinder extremely unstable, and the excessive speed will undoubtedly accelerate its deterioration. At the same time, the swing of the piston in the cylinder will also aggravate the bending degree of the connecting rod. The greater the bending degree of the connecting rod, the crazier the piston swings in operation. Until the end, the piston ring is damaged, the cylinder wall is damaged, the piston is stuck in the cylinder, and the connecting rod will bend or break because it can't bear the huge pressure. What is more serious is that the connecting rod is broken. Then the engine loses power and the vehicle will stop after a short taxi. According to this feature, the loss adjuster of the insurance company will judge whether the damaged vehicle belongs to the category of deductible. On the other hand, we can also protect our later interests by knowing some real situations. Please read on. ● Why does the engine suck water into the cylinder? The path of engine water intake and intake are basically the same. So when talking about this problem, we must first understand how the engine breathes. Here we can show it with an air intake effect picture provided by the manufacturer first, but you should regard the blue part as water. Why is air (water) sucked into the cylinder? It sounds like a philosophical question,' said Bian Xiao of Shiqi Group. Indeed, the more basic the question, the more difficult it is to answer. Negative pressure will be generated during the downward movement of the piston, and then released through the intake valve. If you really don't understand it, imagine it as a syringe without a needle. You can feel the existence of negative pressure by blocking one end with your finger and pulling the piston push rod hard. When the rotating speed is stable, the negative pressure value is almost unchanged. When the driver steps on the accelerator, the oscillation of the accelerator will expand the intake throttle area. At this time, the fuel injection quantity will be corrected with the cooperation of the engine computer, and then the rotational speed will increase (the reciprocating motion of the piston will accelerate instantly). At this time, the negative pressure value will fluctuate greatly. In computer programs, there is a functional relationship between them.