With the onset of the first serious frosts in parking lots and residential buildings unfolds the annual drama. Some drivers, wrapped in scarves, languish in the cabin for twenty minutes, waiting until the temperature arrow reaches the cherished middle of the scale. Others, cynically grinning, get into a cold car and immediately give the gas, claiming that modern technology allows you to ignore any frost. What is the truth and what is the right thing to do, so as not to harm engine And not freeze yourself?
The question of how long it takes heat up In winter, not only beginners, but also experienced motorists are concerned, because the opinions of experts and manufacturers are often diametrically opposite. On the one hand, the old instructions required mandatory heating to operating temperature, on the other hand, modern environmental standards and designs of engines dictate their rules. In this article, we will examine the physics of the processes occurring in the internal combustion engine at low temperatures and determine the optimal algorithm of actions to save the life of your car.
It is important to understand that there is no universal answer that is suitable for all situations. The time required to prepare the car for the trip depends on the type of engine installed, the quality of the used vehicle. motor-oilair temperatures overboard and even lubrication system design. Ignoring these factors can lead to accelerated wear of parts of the cylinder-piston group or, conversely, to fuel overconsumption and contamination of candles.
Physics of the process: what happens inside a cold engine
To understand the need for warming up, you need to understand how you behave. motor-oil at negative temperatures. Unlike water, oil does not freeze instantly, but its viscosity (fluidity) increases dramatically. The cold lubricant becomes similar to thick honey or even solidol, losing the ability to quickly penetrate the narrow gaps between rubbing parts. In the first seconds after start-up, the engine operates in oil starvation mode, which is critically important to consider.
Metal parts of the engine, such as pistons, cylinders and crankshaft, have different coefficients of thermal expansion. With a sharp rise in temperature, the cold piston aluminum expands faster than the cylinder steel, which can lead to bullying. That's why. engineers It is recommended to give the oil time to warm up and gain the necessary fluidity to create a full protective film.
In addition, it is necessary to take into account the heat gaps. In the cold state, the gaps between the parts are maximum, which often causes increased noise and knocking at start-up. As the heat up, the metal expands, and the gaps return to normal. If you start moving immediately, without prior preparation, the load on the mechanical-assemblies It's going to be extreme.
⚠️ Warning: Starting a thick oil engine at temperatures below -20°C without prior preparation can reduce engine life by 15-20% in just one winter season.
Myths about warming up: what manufacturers and reality say
There is a common misconception that modern cars do not require heating at all. Manufacturers do often write in the instructions that you can start the movement immediately after start-up. However, here lies the cunning: it is about the ability to move from the spot, and not that the engine has entered the working mode. The car will go, but engine In this mode, it is consumed much faster.
Another myth says that warming up at idle speeds is harmful to the engine due to the formation of sodium. Indeed, with long idling, fuel combustion may be incomplete, especially on carburetor or older injector models. However, modern engine control systems (ECS) are able to adjust the mixture, minimizing this effect. The balance between the harm from a cold start under load and the harm from idling is shifted in favor of short-term warming up.
Owners of cars with turbocharged There is often a debate about the need to heat up the turbine. The turbocharger rotates at a great speed and requires high-quality lubrication. If you apply a load on a cold turbine, the bearings can fail. Therefore, for such engines, the question of “heat or not warm” is not even worth it – it is necessary to warm, at least minimally.
How long to heat: table of temperature dependence
The time it takes to start a movement safely varies depending on the thermometer outside the window. There is no single number in minutes that fits all the cases. Below is an indicative table based on recommendations from mechanics and engineers for standard operating conditions.
| Air temperature | Recommended warming-up time | Engine operating mode | Action by the driver |
|---|---|---|---|
| From 0°C to -10°C | 1-2 minutes | Idle move | Cleaning the glass, checking the lights |
| -10°C to -20°C | 3-5 minutes | Idle + light turns | Snow removal, navigation settings |
| From -20°C to -30°C | 5-10 minutes | Idle move | Expectation of a downturn |
| Below -30°C | 10-15 minutes. | Idle move | Use of pre-heater |
It is important to note that these figures are relevant for serviceable engines with quality oil. If your car is more than 10 years old or the mileage exceeds 200,000 km, the warming up time should be increased. Old ones. metal-alloy and worn seals require a more careful attitude and a longer time to enter the working thermal gaps.
It is also worth considering the type of transmission. If you have it installed transmission (AVC, CVR, robot), one warm-up of the engine is not enough. The oil in the transmission (ATF) also thickens in the cold. For full heating automatic transmission often required to start the movement and give the box to work under a small load, changing gears.
The algorithm for a proper winter launch
To minimize engine wear and feel comfortable in the cabin, it is recommended to adhere to a certain algorithm of actions. Chaotic attempts to start the engine or sudden jerks from the place will not bring any benefit. Below is a step-by-step plan that will help keep your car healthy.
First, you need to squeeze the clutch (on the mechanics) or press the brake (on the machine) to unload the starter and not turn the gearbox in the first seconds. Turn on the ignition and wait 3-5 seconds for the fuel pump to pump the required pressure into the ramp. Only after that, turn the starter. If the engine is not caught the first time, do not immediately try to start it again - let the battery recover.
After successful start-up, do not immediately turn on the stove at full capacity. The cold heater radiator will not give away heat, but only take it away from the already cold antifreeze, slowing the heating of the engine. It is better to turn on the heating of the windshield and mirrors, and the fan of the cabin to start at minimum speeds in a couple of minutes.
☑️ Winter launch checklist
Features of heating diesel and turbocharged engines
Diesel engines in winter require much more attention than gasoline counterparts. Due to the high injection pressure and the peculiarities of mixing, it is more difficult for a diesel engine to ignite fuel in cold cylinders. Therefore, the presence of serviceable lamp-light Quality winter fuel is critical here. The candle light on the dashboard is your main reference point.
Turbocharged engines, regardless of the type of fuel, have their own nuances. The turbine is a high-speed node and its slip bearings require an instant supply of oil. Modern turbines use ceramic bearings, which are less sensual, but the risk still persists. Turbocharger It starts working as soon as the engine emits exhaust gases, so the oil film must be ready to work before starting the movement.
For diesels and turbo engines, the “warm longer” rule works seamlessly. If a gasoline atmospheric can forgive a short warming up, then a diesel in the cold will work hard and noisy until the combustion chamber warms up. Long-term idle speed for diesel is less harmful than for a gasoline engine, since diesel engines are often used in constant load mode (trucks, generators).
Why does diesel smoke cold?
White smoke from the exhaust pipe of a diesel engine at start-up is most often unburned fuel and condensate. In a cold cylinder, the temperature of the compressed air is not sufficient for complete ignition of the solarium. As the cylinder block warms up and the smoke goes into operation, the smoke should stop. If the smoke is black - it is enrichment of the mixture, blue - a carbon monoxide of oil.
Driving after warming up: how not to damage the car
Even if you warm up the engine to 40-50 degrees, this does not mean that you can immediately switch to an aggressive driving style. Metal parts have warmed up, but the oil in the transmission, differentials and hubs is still cold and viscous. The first kilometers of the path is a continuation of the warming process, but already in motion.
Move the first 5-10 minutes in gentle mode. Avoid sharp accelerations, high revs (more than 3000 rpm) and sharp braking. Try to keep the speed in the range of 40-60 km / h, allowing all components of the car evenly to reach the operating temperature. Especially concerning. hub-bearing and suspension elements that become fragile in the cold.
Pay special attention to the transmission. On the mechanics, try to switch smoothly, without jerks. On the machine, let the box warm up itself: the first minutes do not turn on the “Sport” mode and do not use manual gearshift. CVTs are particularly sensitive to cold and can go into emergency mode when starting cold.
Full heating of the car is possible only in motion. Idle only heats the engine, leaving the transmission and chassis cold.
Is prolonged warming up at idle harmful?
There is an opinion that a long warming up on the spot harms the engine. And that's partly true. When working at idle speeds, the combustion temperature in the cylinders is lower than under load. This leads to the fact that the fuel does not burn completely, forming acid compounds and resins that settle on the walls of the cylinders and are washed into the crankcase, liquefying the oil. In addition, spark plugs can be covered with carbon.
However, the damage from 5-10 minutes of warming up is incomparable with the harm from the operation of a cold engine under load. Acids and condensate are formed in any case on short trips in winter, and the only way to get rid of them is regular oil change and periodic trips along the track over long distances. Therefore lapse It is the lesser of evils.
The environmental aspect cannot be ignored either. In many countries, for example, in some states of the United States and regions of Canada, heating a car on the spot is prohibited by law and is punishable by fines. It is believed to pollute the atmosphere. In our latitudes, this is more loyal, understanding the climatic features, but it is still not worth leaving a car with a working engine without supervision.
⚠️ Warning: Never leave a warm-up car in a closed garage or underground parking lot. Exhaust gases contain carbon monoxide (CO), which is odorless and deadly to humans in an enclosed space.
Frequently Asked Questions (FAQ)
Do you have to wait until the temperature rises to the middle?
No, waiting for a full warming up (90 ° C) in the parking lot is not necessary and even harmful. It takes 3-5 minutes for the oil to spread through the system, and then you can start moving in a gentle mode. The engine will quickly reach the working temperature in motion.
Can I heat my car with gas (GBO)?
Starting the engine on gas in winter is not recommended. The gas is in the cylinder under pressure and in a liquefied state, but the gearbox needs heat to evaporate it, which a cold engine cannot give. This will cause the gearbox to freeze and damage the membranes. The launch should always be on gasoline.
How much do you need to heat a CVT in winter?
The variator requires special attention. After heating up the engine (3-5 minutes) you need to stand for a couple of minutes, transferring the selector to mode. D And by holding the car on the brakes. This will allow the oil in the variator to start circulating. The first kilometers move very smoothly, without jerks.
Is it true that the modern engine does not need to be warmed?
That's half-truth. Modern engines have lower tolerances and go into mode faster, but the physics of oil has not gone away. Cold oil doesn't protect you. Therefore, a minimum warming up of 1-2 minutes is necessary even for the newest cars to extend their life.
Use synthetic oils with low solidification temperature (0W-30, 0W-40). They retain fluidity even in severe frosts, providing lubrication in the first seconds of engine operation.
To sum up, we can say that the middle ground in the matter of warming up still exists. Do not go to extremes and warm the car to blue or, conversely, rape a cold engine. 5 minutes of your time spent waiting at a warmed-up car can save thousands of rubles on future repairs and give confidence in the reliability of equipment in any weather. Take care of your cars and they will respond to you with uninterrupted service.