Do you still need a hot car in summer? How long does it usually take for a car to warm up?

In most cases, you only need to stay 10 seconds-30 seconds after landing, even in cold winter, it doesn't have to be more than 2 minutes. This is just enough time for you to fasten your seat belt, hold the steering wheel tightly and get ready for work. Then the vehicle can be driven out for a distance at low speed/idle speed. When the speed is stable, you can speed up the car. Only when the car is gone can it quickly enter the working state. During the period, control the speed not to exceed 2000 rpm, shift gears gently and refuel smoothly. This is the most standard and correct "hot car method".

1. As long as the engine is running, all the parts in it will move, and the oil will be pumped out of the oil pump from the moment of ignition, and it will circulate continuously in the engine, playing the role of cooling and lubrication. But when the temperature is low, the viscosity of the oil will be very high, and it takes about 20 seconds to circulate.

2. Other parts that need to be "hot" include fuel injection system and coolant, but they can also be circulated in place within half a minute to one minute. Even in the low temperature environment in winter, 1 minute is enough to warm the car in place, and it is not necessary after 1 minute. If you want to make the speed and water temperature reach the standard value by idling in place, I'm afraid 10 minutes can't be done.

Extended information of cold start wear;

1, the main source of engine wear is cold start wear, not normal driving wear and cold start. Because of the high oil temperature, low viscosity and good fluidity when the engine is stopped, most of the oil slides down to the oil pan under the action of gravity, and a thin oil film will be adsorbed on the friction surface of the moving parts. At present, many oil manufacturers are emphasizing the protection of cold start, which means the role of this oil film.

2. However, with the increase of cold start time, such as stopping for a few days, the oil film will gradually become thinner and its strength will decrease. At this time, the moving parts will be in a state of dry friction or boundary lubrication. When starting again, because the oil pump and the moving parts are running at the same time, the oil supply will be delayed, and the originally extremely thin oil film will be destroyed by the relatively moving parts. If we continue preheating at this time, it will only accelerate the wear of parts.

References:

People's Network-You know what? It's a big pit to warm the train in place for a long time.