Will low water temperature affect the engine?

According to the description of the subject, the water temperature has not reached 90℃ after driving for several hours, and the problem is not big.

Generally speaking, the normal working temperature is that the engine water temperature is between 85℃ and 95℃. As long as it is not lower than 80℃, it can be ignored. If it is below 80℃ for a long time, it is estimated that the thermostat of the car is faulty.

The driving described by the subject did not reach 90℃ for several hours. If it is driving at a high speed, it is normal. Mainly when driving at high speed, the influence of wind speed and large air flow indicate that your vehicle cold car system works very normally.

If you are driving in urban areas or on ordinary roads, if the water temperature is lower than 80℃, the thermostat is stuck. If it is lower than 60℃, the thermostat is completely ineffective.

Have good judgment on this issue. Run at low speed and high speed, or try climbing a mountain. If the water temperature is still low, the thermostat is invalid.

If the water temperature is low, what is the impact on the vehicle?

Analyze it here. The low engine water temperature is mainly due to incomplete fuel combustion. When the fuel cannot be completely burned, the following consequences may occur.

1, the dynamic performance of the engine becomes worse.

2. The engine carbon deposit increases. Including throttle, valve, cylinder liner, piston and piston ring, spark plug and so on.

3. Increased fuel consumption.

4. The early wear of parts reduces the life of parts.

5, emissions are not up to standard.

Do many people have this experience during the annual inspection of the original second car: when the engine is cold, the exhaust gas can't be measured, but after the engine runs at high speed for a period of time, it is qualified to measure the exhaust gas again. In fact, after the engine temperature is normal, the fuel burns fully and the exhaust gas reaches the standard.

Under normal circumstances, the water temperature is below 90℃ for a short time, so don't worry, there is no problem. This will happen if the temperature is always low.

For example, the increase of carbon deposition will lead to unstable idle speed, increased fuel consumption, damaged spark plugs and so on.

90℃ is the normal working temperature, so don't worry. Remember, cars serve people. Don't take them too seriously The car is parked, not open.

Of course you can't open the explosion!

A car hot review, original is not easy, refused to carry! When the engine is running, it will produce high temperature. The normal temperature range of an ordinary family car engine should be between 85℃ and 100℃. If the temperature is too high, more liquid will be vaporized, forming great pressure. When this high-intensity pressure is too large, what we call "boiling" will happen.

The boiling point of cooling water is about 130℃, which is much higher than the boiling point of ordinary water, so even if the temperature detected by the water thermometer exceeds 100℃, sometimes there will be no boiling problem.

But remember not to open the water tank cover rashly after parking, because the high-temperature and high-pressure gas inside will be ejected instantly, which will harm your health.

If the temperature is too low, it will increase the degree of engine wear, increase the probability of carbon deposition, increase your fuel consumption, and gradually deteriorate the performance of engine internal components.

Because the working temperature of the engine is a range value, the perennial temperature mentioned by the subject is less than 90℃, and if it is not lower than 85℃, it belongs to the normal range.

Now the car can automatically adjust and control the temperature of the water tank. The method is to close the thermostat and open the bypass valve when the engine temperature is too low. At this time, the cooling water channel inside the radiator is cut off, and the cooling water flows out of the cylinder head water jacket, enters the water pump through the bypass valve and bypass pipe of the thermostat, and is sent to the cylinder block water jacket by the water pump.

Because the cooling water does not dissipate heat through the radiator, the engine temperature can rise rapidly, which is called small cycle.

Small cycle is common in the early stage of automobile cold start, which needs to raise the engine temperature quickly.

When the engine temperature is too high, the thermostat runs just the opposite of the small cycle. The main valve is open and the bypass valve is closed. All cooling water enters the radiator from the main valve to dissipate heat, so that the water temperature will drop rapidly and then be pumped to the water jacket of the cylinder block. This cooling method is called large cycle.

It can be seen that the thermostat is the key to keep the engine at normal working temperature for a long time, but many old drivers have the habit of disassembling the thermostat.

After removing the thermostat, the engine can dissipate heat faster, which can reduce the frequency of starting the fan and even reduce the fuel consumption for the owner in summer. But it also has its shortcomings. At present, most of the thermostats used in automobiles are wax thermostats, which have the advantages of reliable operation, simple structure, firmness and durability, convenient manufacture, easy mass production and low cost, so they are widely used.

The characteristics of wax thermostat are: 1, the lift of valve only reflects the change of water temperature, which is not affected by the internal water pressure of engine, and the sensor is rigid enough;

2, the size of the internal inductor is small, and the flow resistance of cooling water is very small;

3. The internal mechanical parts have high strength and long service life, and are suitable for various models.

However, the disadvantage of this wax thermostat is also prominent, that is, it takes a long time to absorb heat when it is opened, so don't run at high load when the car is not warmed up, otherwise it will pull the cylinder when the pot is opened in the cylinder but the thermostat is not opened, and disassembling the thermostat just makes the engine warm up for a longer time, which will bring cold grinding effect to the engine, and its wear hazard is no less than that caused by boiling.

To sum up, the engine runs in a low temperature environment. When the temperature is 5℃, the wear of the cylinder is equivalent to the wear of the car running for 30 ~ 40km, and when the engine is started at-18℃, the wear of the cylinder is equivalent to the wear of the car running for 250km.

Moreover, in the service life of the engine, 50% of the cylinder wear occurs in the starting process, and the low-temperature starting wear accounts for about 60% ~ 70% of the total starting wear. The lower the temperature, the greater the engine wear.

Therefore, if the owner finds that the working temperature of his car engine is not within the normal range, he should first consider whether there is something wrong with the thermostat.

When the water temperature is low, driving slowly has no effect on the car. If you drive violently when the water temperature is low, it will have a great impact on the car. This is also the reason why warm-up is needed when starting the vehicle in most cases.

First of all, the engine has an operating temperature. The water temperature is too low, indicating that the engine temperature is too low to reach the normal working temperature.

If the engine temperature is too low, the fuel supply system cannot completely vaporize gasoline. At this time, if you drive violently, unburned gasoline will adhere to the throttle, cylinder wall or piston to form carbon deposit.

A long time will lead to ignition difficulties, increased fuel consumption and abnormal idle jitter. But also aggravate the wear and tear of engine parts.

The most important thing for a hot car is to drive slowly, rather than idling in place. Driving slowly means that the engine is moving. As long as the engine is running, it helps to raise the temperature.

Many car owners think that hot cars only need to idle for a few minutes, which is wrong. Idling in place can only warm up the engine, such as gearbox, transmission system and steering system. , need to move to warm up.

The water temperature of the engine is maintained and guaranteed by the cooling system. Too high or too low water temperature can cause problems. Let's talk about the problems easily caused by low water temperature.

1. The experiment of increasing engine wear at low temperature proves that the wear degree of engine at low temperature is about 5 times higher than that at working temperature. This is mainly because the engine is made of metal, which expands when heated and contracts when cooled at different temperatures. Therefore, it is necessary to consider the matching gap between parts at different temperatures when designing. Because most of the engine is running at the working water temperature, which is about 90 to 1 10 degrees Celsius. Therefore, the first principle of design is to ensure the matching at this temperature first, that is, at this temperature, the long-term running wear is the least, so the engine can not guarantee the best matching gap and the minimum wear at low temperature because of the thermal expansion and cold contraction between materials. Therefore, in general, in order to reduce the wear and tear of the engine at low temperature, the engine is usually designed with a hot start program, that is, when the engine temperature is low, the engine temperature is increased as soon as possible by fast idling to reduce the wear and tear between parts.

2. Low combustion efficiency and increased fuel consumption. The engine burns by mixture ignition or compression ignition. When the engine temperature is low, the cylinder temperature is low, which usually leads to the decrease of the atomization degree of the mixture. In addition, the decrease of air temperature also leads to the increase of air density. Therefore, at low temperature, the engine needs to compensate the fuel, that is, it needs to carry out enriched injection to maintain the operation of the engine. Relatively speaking, rich injection will reduce the combustion efficiency, because the theoretical optimal air-fuel ratio is 14.7: 1. Concentrated injection may lead to air-fuel ratio around 1 1: 1. Excessive injection will lead to incomplete combustion and increase fuel consumption.

Why can't the water temperature of the engine reach the working temperature? Under normal circumstances, the water temperature should reach the working temperature after the engine works for a few minutes. Second, after the engine runs for a long time, the water temperature still can't reach the working temperature. There are two possible reasons:

Thermostat failure Usually, the engine controls large or small cycles through the thermostat, which is a strategy for the engine to control the water temperature. When the engine is running at low temperature or cold car, the thermostat is closed and the water circulation of the engine is in a small circulation state. The purpose of this is to make the temperature of the engine cylinder rise rapidly, reach the basic conditions of lubrication, and thus reduce wear. When the water temperature in the small cycle reaches a certain design temperature, the thermostat will be opened, and the cooling water will be cooled in the large cycle, thus reducing the water temperature of the engine.

When the thermostat fails, it can't be opened and closed at the specified temperature and can't make a small cycle, the water temperature of the engine will be delayed.

Failure of water temperature sensor or cooling fan When the engine water temperature reaches 95 degrees Celsius, the cooling fan will be turned on for forced cooling. However, if the water temperature sensor fails, or the cooling fan fails, it may lead to the failure to start normally or even run continuously when the water temperature is low, thus causing the engine water temperature to fail to reach the working temperature for a long time.

Will low water temperature affect the engine? The answer is yes, because internal combustion engines pay attention to thermal efficiency. Do you think how to achieve thermal efficiency if the water temperature of the car engine does not go up?

After starting the engine in winter, the idle speed of the engine is obviously higher. After running for a period of time, the idle speed of the engine will automatically return to normal idle speed. This process is called fast idle. The purpose is to make the engine water temperature rise rapidly and reach the normal working temperature, which is beneficial to an atomization effect of fuel in the cylinder.

In the past two years, both domestic cars and joint venture cars have experienced an increase in engine oil, but they all have one characteristic, that is, compared with the south, the increase in engine oil in the north is obviously higher than that in the south. This is because the northern climate is cold and the engine temperature is low, which leads to the unsatisfactory atomization effect of fuel in the cylinder and insufficient combustion, and part of it flows into the oil pan along the cylinder wall.

Faced with the phenomenon of increasing engine oil, the solutions given by relevant car companies are also * * * in nature, that is, reducing the circulation speed of cooling water circulation branch to improve the engine water temperature, increase the volatilization effect of fuel in the cylinder and make it burn fully.

In order to pursue thermal efficiency, electronic thermostat replaces the traditional wax thermostat in cooling water circulation control. Its purpose is to control the opening and opening time of the thermostat more accurately, so as to control the optimal working water temperature of the engine.

It can be seen that the importance of water temperature to engines is self-evident. My name is Feng Zi, and I am an auto mechanic. You can pay attention to the problem of repairing the car, or you can leave a message or a private message to me.

Low engine water temperature _ affects the high engine temperature of many cars, which will lead to the abnormal operation of vehicles, have a great impact on the lubricating ability of oil, and even damage the body materials to a great extent. Therefore, it is a routine project to regularly check, replenish and replace antifreeze coolant, but if the water temperature cannot be continuously raised, it is actually a failure; Although it is not impossible to drive normally, it will also have a significant impact on the engine working condition and fuel consumption, resulting in two fault points of low temperature.

Fault analysis 1: water temperature sensor is damaged! "Thermal efficiency" is an important reference data for evaluating the quality of an engine. Its concept is that the ratio of thermal energy to mechanical energy generated by combustion is about 35% on average (the rest is wasted). However, even such a low ratio can only be achieved when the engine block and antifreeze coolant reach about 100℃. Because the fuel injection quantity can be adjusted by the "theoretical air-fuel ratio" at a reasonable high temperature, it is necessary to enrich the low-temperature standard for power compensation.

Therefore, ECU needs to monitor the change of water temperature in real time. What impact will it have on the engine if the water temperature sensor is damaged and cannot read high temperature data?

2: The thermostat is damaged! The cooling circulation system of the internal combustion engine is divided into two paths, one is the low-temperature "small circulation" during cold start, that is, the antifreeze coolant flows out of the cylinder head for local constant temperature, and the coolant is quickly heated by high heat energy. When the water temperature reaches about 90℃ (Celsius), the high-temperature coolant melts the paraffin in the thermostat, and uses the principle of volume expansion to close the small circulating water channel and gradually open the large circulating water channel, thus realizing the overall temperature rise of the solution and the cooling of the solution in the precooling water tank.

Once the large circulation mode is started, the coolant will flow to the cooling water tank which is continuously cooled by suction air, and then flow to the cylinder head again to absorb heat at low temperature, and it will be repeated. If the thermostat is damaged, it will be a big cycle during cold start, resulting in a slow temperature rise.

Key points of low temperature influence: The damage of water temperature sensor will cause the engine to be unable to read high temperature data all the time, and ECU will default that the engine will never heat up. This is not a programming error, because it is really difficult for the engine to heat up in the distant northern winter. Ultra-low temperature and air cooling will lead to extremely low temperature of the body and liquid! Therefore, some trucks will block the air inlet of the front with a "windproof quilt" to help the engine warm up.

However, after the sensor is damaged, ECU can only default to low temperature, so the state of enriched fuel injection will continue and fuel consumption will increase exponentially! At the same time, the setting of cold start and centralized fuel injection will also cause insufficient combustion. This chemical reaction will produce colloid and free carbon particles, which will be mixed with a large amount of water vapor produced by combustion and impurities ≤PM2.5 in the air to form carbon deposit. The accumulation of carbon deposits will reduce the ignition intensity and fuel injection atomization standard, the intake air may also be blocked, and the working condition of the engine will get worse and worse-the fuel consumption will get higher and higher.

Warm air: The car's warm air system relies on "antifreeze coolant heating". After adjusting the temperature block to the red standard, turning on the fan will start the waterway control valve. The high-temperature antifreeze coolant flows to the warm air water tank for heating, which makes the water tank very hot. Then the blower blows the low-temperature air through the high-temperature water tank to heat it and send it into the car, which is called warm air. Moreover, if the thermostat is damaged, the temperature will rise slowly in low temperature winter, and the warm air will not be used for a long time.

Summary: Low engine temperature is also caused by failure. If the engine runs normally after starting 15~20 minutes and the water temperature does not rise, if the warm air conditioner is turned on at this time, if there is obvious hot air, it is mostly the fault of the water temperature sensor. On the contrary, if there is neither rising nor warm air after driving for a long time, it is likely that the thermostat is faulty. As for driving in extremely cold areas, it is normal for the temperature to rise slowly, but the windshield is not suitable for general family cars, because the engine air inlet is at the front of the car, which will cause the engine to stall without air.

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The influence of low water temperature on the engine: it will lead to insufficient fuel combustion and reduce the working efficiency of the engine; Insufficient fuel combustion causes carbon deposition, which not only increases fuel consumption, but also pollutes the environment; Working at low temperature for a long time will accelerate the wear of internal parts of the engine.

1, thermostat is broken.

The water temperature is determined by measuring the temperature, and then the inlet and outlet flow of coolant and the opening and closing of the fan are controlled according to the actual temperature. If the thermostat is damaged, the coolant will always flow into the engine to dissipate heat, resulting in the low water temperature all the time, which will also lead to the low water temperature.

2, the cooling fan often turns, and there is a cooling fan.

In addition, the fan is another reason for the low water temperature. Because the fan will only start when the water temperature is high, and the fan will stop working when the water temperature is normal or low. However, if the fan has been working, it means there is a problem. At this time, we only need to check and maintain it in time, otherwise it will not only lead to low water temperature, but also cause the fan to work all the time and even burn out the fan.

According to the temperature of your current water thermometer, the temperature is normal. It is no problem to reach this temperature in a few minutes. If the temperature is too low, it will have a great influence on the engine, and the fuel consumption will increase, and the engine will wear faster, and all parts will be affected. Your temperature is normal.

The water temperature is low, and the car is a little expensive and does not slip.

It is normal for the temperature to fluctuate slightly within the normal range, so there is no need to be nervous.