Why do cars spontaneously ignite when the weather is too hot?

The outside weather is too hot and the temperature is too high, which is more likely to cause the car to spontaneously ignite. However, the spontaneous combustion of the vehicle is usually caused by the following reasons:

1. Hidden dangers of inferior modification

In fire and spontaneous combustion accidents caused by line faults, the main reason is "grounding". This phenomenon is mainly due to line aging, overload, short circuit, poor contact or worn "ground" problems, which can generate very large amounts of heat. If the quality of the wires is not good enough, or there are many flammable and explosive items around, it is easy to cause fire and spontaneous combustion accidents. For example: the cables, the frame, and the cable clamps are broken due to vibration and friction; the tail lights, brake light wires, etc. are broken due to vibration and friction; the insulation parts of the lamp holder are loose due to vibration and damage to the connecting parts. If the vehicle is detached or damaged, it will "ground" itself when the vehicle is running or parked, causing flashover for a long time, generating high temperatures, causing insulation damage to electrical appliances, switches, and wires, thereby increasing the scope of flashover, expanding the high-temperature area, and finally leading to Paint, leaked gasoline, flammable items, etc. may spontaneously ignite if they come into contact.

2. Short circuit of wires and electrical appliances

The most common short circuit of electrical wires and electrical appliances is that the starter switch is welded due to contact sintering, and the starter magnetic switch cannot be released, causing the starter to take a long time. time to start (the safe starting time of the starter is 5 seconds), causing the starter to heat up and catch fire. In addition, in some single-wire cars, the damaged insulator of the live wire or the "ground" of electrical appliances will cause a short circuit, especially for some vehicles that have been used for a long time, have old wiring, and have chaotic wiring arrangements. The "protector" of the car's wires is the fuse. Once the wire is short-circuited and a large current is generated in an instant, the fuse will be blown quickly. However, if the fuse is too large, for example, someone tries to replace the standard fuse with a copper wire, resulting in the loss of protection function, it may short-circuit the wire and cause a fire.

3. Improper parking location

Since cars produced today are generally equipped with three-way catalytic reactors, and the temperature of this device located on the exhaust pipe is very high, the temperature is generally The temperature is 300°C to 400°C, so once there is flammable material under the car at this time, it will be easily ignited by the three-way catalytic device, causing the vehicle to catch fire and spontaneously ignite.

4. Place dangerous goods in the car

In fact, dangerous goods are not only large oil tankers, but also lighters, perfumes, mousses, etc. in our daily lives that constitute car fires. of dangerous goods. If we place these items in a part of the car where the sun's rays are easily focused, there is also a certain risk of fire. Therefore, when locking the car, you should check the interior of the car to make sure not to leave these dangerous items, let alone dangerous oils such as gasoline and diesel.

5. Electricity leakage

When the engine is working, the temperature of the ignition coil is very high, which softens, ages and cracks the insulation layer of the high-voltage ignition wire. The ignition high-voltage electricity easily breaks down the insulation. layer, it is easy to produce high-voltage electric leakage, causing the temperature of the leakage area to rise continuously, igniting the leaked gasoline from the engine, carburetor, etc., resulting in fire.

In addition to the above major reasons, there are actually oil leaks, long-distance driving in hot weather, excessive contact resistance, etc.