Hello everyone, this is a column focusing on car repair and maintenance. There are car mysteries you don’t know, and it will teach you how to avoid the big pits on the road of car ownership. I believe that not only you but also many people have a certain sense of obscurity about the car aftermarket, which will help you uncover the unknown stories of car repair and maintenance.
There is not only hot and dry but also continuous rain in Beijing in September. It can be said that there must be rain when going out in the past week. Rain Water is naturally piled up on the road, and many car owners will encounter a sudden flameout when crossing the flooded road. At this time, most car owners will insist on starting the engine, which will lead to a complete collapse of the vehicle.
In this issue, the editor will take you to understand why vehicles crossing stagnant roads can no longer start the engine after flameout!
Now the car air intake is almost designed to the front, because this can have a better air intake efficiency.
The air intakes of almost all models are close to the intake grille and are only slightly higher than the tires.
The cause of a vehicle stalling
For a car traveling in the water, when the wading depth is about to approach the height of the air intake, Rain Water will enter the engine directly through the air intake.
After the running engine pours into Rain Water, the burning mixture in the piston will be extinguished instantly. Originally, it was not easy for the mixture to be ignited, but as soon as it was poured with water, the engine stalled directly.
This is the main reason why the car will suddenly stall when driving in the water.
Second, why can’t the engine be started again after the engine is flameout?
When the car stalls in the water, many car owners always want to fight hard and challenge their wallets with their own courage. As a result, they spend a lot of money on car repairs.
As I mentioned above, the reason why the engine stalled is that there is water inside the piston. Liquids are incompressible, and so is water. At this time, the engine piston starts to move up, and the intake and exhaust valves are closed if it is in the compression stroke. The starter gives a huge torque to the engine, and because the water cannot be compressed, the piston will be subjected to the reverse force from the water and will bend the connecting rod directly.
As for the effect, it is the present state. You can imagine how powerful this is.
And the engine will face the situation of being overhauled, the engine connecting rod can not be replaced alone, as long as there is a damage, all must be replaced. Take the most common four-cylinder engine, for example, the maintenance cost is also in the thousands of yuan. For some high-end models, maintenance costs of tens of thousands of yuan are all too common.
The insurance company does not accept claims for this situation, even if it is covered by wading insurance, because it belongs to the thought of damaged engine.
Third, how to prevent this from happening?
Now that we know that water intake is the root cause of engine damage, can we improve the water intake situation? So in front of this product appeared, in the modified car can often see the external intake pipe, its scientific name is wading hose. The aim is to improve the height of the intake pipe to improve the wading ability, which belongs to the ultimate player’s equipment.
For us ordinary people, wading pipes are not applicable.
1 model is very limited, cars and some SUV installed it is almost meaningless.
2 wading pipes are modified accessories, and some areas can not pass the annual examination in laws and regulations.
In fact, the best way is to see more than the depth of the floor of the stagnant water road surface do not force through. After all, cars are not tanks, so they have to be used properly.
MarshHuntington 
6 
April 1, 2024 
