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What are the hot start and cold start of the car?

As a small partner, cold start should be a word I often hear, even I often say it myself. For example, in winter, my friends often ask me what the problem is when the car shakes during a cold start. I often need a few fires to start it. What problem? The same antonym "hot start" is often used in cars, but do you really know what they mean? Do you know the difference between them? Learn about the hot start and cold start of the car first.

The meaning of automobile hot start and cold start.

Cold start means that after the engine is turned off for a period of time, the engine has cooled down, its temperature is much lower than the normal working temperature, and the oil basically flows back. At this time, the engine starts, which is a cold start.

In most cases, we can measure the ambient temperature, that is, after the engine is turned off, the temperature slowly cools to below 40, and most of them last for about 2 hours. At this time, it is a cold start.

Hot start means that the engine temperature is still near the normal working temperature shortly after the engine is turned off, and it does not drop much. The oil on the engine friction surface has not returned, and the oil film is still there. Then the start at this time is a hot start.

Difference between hot start and cold start of automobile

1. Cold start is more harmful to the car. More than 80% of engine wear is caused in the cold start stage.

2. Compared with hot start, cold start is more difficult to start the car and takes longer to start. There are three aspects.

Causes of cold start and hot start of automobile

A, cold start, the internal temperature of the engine is too low, and the mixed gas is not easy to vaporize and burn;

B during cold start, the engine oil temperature is not enough. Even if the oil with proper viscosity is at the moment of cold start, the viscosity is too high. It takes time to increase the oil temperature, thus accelerating the lubrication of engine parts;

C. During cold start, the internal parts of the engine have a large gap, and it takes time to warm up. After preheating and expansion, the specified gap can be gradually reached. Because the gap is too large, the oil film cannot cover the lubrication;

Speaking of which, I have to talk about hot cars in winter. Many people say that BMW doesn't need to heat the car, but friends think about it: it takes time to raise the internal temperature to make the internal parts gap reach a suitable value. It takes time for cold engine oil to flow through the engine. Even if the time is shorter, it will be ten or twenty seconds, just wait for half a minute.

After reading the introduction of "Auto Repair Bian Xiao", do the friends know anything about the hot start and cold start of the car? Do your friends like the content knowledge recommended by Repair Bian Xiao for your friends today? Bian Xiao believes that friends still need to know some of these contents, which is very helpful to all friends. Finally, I hope that the brief introduction of the car repair editor can help my friends.