In the past two days, Tai Ge has been driven crazy by some "senior people" on the Internet.
Such people are generally divided into two factions, the antifreeze maintenance-free faction and the anhydrous antifreeze noble faction. The former constantly promotes that the original factory is now a long-term antifreeze, and there is no need to change less water. The latter, it is said that the ordinary antifreeze will corrode the engine for a long time, and the anhydrous antifreeze can avoid this reaction, and it is also maintenance-free.
Anyway, the purpose is to change the law to "save money" for the owners and masters, so there are really car owners who believe in their set. Tiger met more than one car repairer who had written to them and paid the IQ tax. Today, in order to correct the audio-visual, Tai Ge is happy to talk to you about waterless coolant today.
Anhydrous antifreeze is actually the replacement of water with oil
I remember when Tiger was a small fart child, the Audi 100 at home used distilled water as engine coolant, and every year Li Dong went to the auto repair plant to add a thing called antifreeze: half a tank of water mixed with half a tank of solution, and then safely overwintered. So what is the development of antifreeze today more than a decade later? What exactly is the anhydrous antifreeze?
For most of the family cars on the market now, the engine antifreeze coolant is basically based on the aqueous solution of ethylene glycol. The freezing point of ethylene glycol is -11.5 °C, the boiling point is 197.4 °C, and the freezing point after mixing with water can reach as low as -68 °C. Ethylene glycol type antifreeze can be recycled after use, after precipitation, filtration, adding water to adjust the concentration, adding preservatives, so the recovery cost is low and the price is lower. Therefore, a large number of OEMs will use this antifreeze coolant (long-lasting water-based antifreeze) as a matching device for the original vehicle.
The main component of the anhydrous coolant is propylene glycol, the specific heat capacity of water is about 1.6 times that of propylene glycol at room temperature, it can be said that the heat dissipation effect of propylene glycol is worse, but this is not completely a bad thing. Due to the small heat capacity of the waterless antifreeze and the slow heat dissipation, the engine can be heated up quickly when the cold car starts and the working temperature can be reached faster. However, due to the higher production cost of propylene glycol, and there is no large number of OEM supports.
So many propylene glycol "anhydrous antifreeze" manufacturers began to say that this antifreeze effect is good, fuel-saving, hot car fast, etc., so is this really the case? Tai Ge borrowed two identical cars from his friends to test which of the original car water-based antifreeze and anhydrous antifreeze were better.
GK5 for waterless antifreeze in situ geothermal car is not as good as the original
In order to test whether there is a difference between anhydrous antifreeze and ordinary water-based antifreeze, it just so happens that the brothers who played with cars around Tiger have recently changed their GK5 to anhydrous antifreeze, and another friend who does insurance sales also bought a GK5 this year, coincidentally, both cars are 18 manual low-end, so Tiger will borrow these two cars to do this idling heating test.
Also 18 1.5L manual fit, waterless and original which hot car is faster?
Details such as specific test methods are as follows:
Test environment: In the same environment, two cars are parked for more than 4 hours to cool down to ensure that the engine starts cold.
Test method: After the engine starts, the idle heat car is turned off, and the engine idle speed falls back to 850rpm/min to calculate the time.
First of all, Tiger or first test the data of the original antifreeze idle heating. In the actual measurement, 18 fits are parked in the underground parking garage at room temperature of 16 °C, and it takes about 2 minutes and 21 seconds for the original test data to idle to the water temperature lamp to go out and the idle speed to stabilize at 850 rpm/min.
The Fit does not have a water thermometer, only by idling and indicators
The idling speed stabilized at 2 minutes and 21 seconds at about 850 rpm
The same 1.5L low-equipped manual, anhydrous antifreeze is longer
Next, Tiger will use the same waterless antifreeze to start idle to the minimum operating temperature and idle speed of 850 rpm, the test results almost make Tiger wonder if this waterless antifreeze is not a fake. The heating rate of the idle hot car is not as fast as the original water-based antifreeze.
The owner of the waterless antifreeze adds an additional OBD reading to read the temperature
To the warm car to complete the waterless antifreeze is actually longer than the water base
The test results are nearly 2 minutes worse, and the price is 3 times worse
In fact, from these two antifreeze idling car tests, it can be seen that the difference between the original plant ethylene glycol water-based semi-antifreeze and the sub-plant anhydrous propylene glycol antifreeze in the idle heating car test is very abnormal. Moreover, after The friend of Tiger learned that the price of the domestic anhydrous antifreeze replaced by this car is much cheaper than that of a wen mouso, the actual cost is about 500. Compared with ethylene glycol water-based antifreeze, it is more than 300 more expensive.
From here, it is not difficult for us to draw a conclusion: although antifreeze is also a consumption-resistant oil product, but like the waterless antifreeze heating machine speed is slower and more expensive than the ordinary waterless, it is really the "health science" of the car industry!
"Health care products" with low cost performance
Only pipe corrosion can be prevented
In fact, from the perspective of recognized data, in fact, the braking distance of semi-metallic, low metal and ceramic blades of the same level should not be too bad. But why is the braking performance of the "ceramic" brake pads bought by Xiaobian in auto parts city actually weaker than that of low-metal and semi-metallic brake pads?
Comparison of the dimensions of the two antifreeze
In fact, from the theoretical data, the specific heat capacity of the waterless antifreeze is much smaller than that of the general antifreeze, and the hot car should be faster, but in fact it is much slower than the water-based antifreeze of the original plant.
In fact, it can be seen from the above table that although the water-based antifreeze is faster than the heat capacity, the heat absorption speed of the anhydrous antifreeze is poor. Therefore, it has a certain effect of helping to warm the machine, but from the perspective of realistic tests and theoretical data, it is not suitable for car owners in high-temperature areas. Is that waterless antifreeze really useless?
In fact, it is not, its selling point is mainly to the pipeline without corrosion and no fouling.
Antifreeze aging clogging
For the traditional ethylene glycol water-based antifreeze, the most feared is the aging of the antifreeze. Conventional phosphate antifreeze produces flocs after aging. This is the same as the blood clot in the human blood vessels, slowly blocking a certain pipe of the engine, causing the local high temperature of the engine. The light engine shakes and knocks, and the heavy water temperature is too high the engine pulls the cylinder.
Antifreeze "coffee cream" melts, learn about it ~
Antifreeze corrosion cylinder block
Another aging problem of traditional water-based antifreeze is the defect caused by the characteristics of ethylene glycol itself. Whether it is the current organic acid long-acting antifreeze or phosphate antifreeze, the characteristics of ethylene glycol itself that loves to absorb water will continue to reduce the boiling point of the antifreeze, and the unclean atmosphere is prone to "cavitation" after entering the antifreeze, resulting in corrosion of the antifreeze pipeline.
The glory of Wuling that Taige dismantled last year was to add water indiscriminately to cause "gas erosion of the cylinder body"
In this case, once the engine cooling pipe and the oil pipe are mixed, they are immediately scrapped within two hours of starting. But both of these phenomena have a big premise, that is, the antifreeze overdue maintenance or private addition of water will appear. For a large number of cars equipped with organic acid glycol antifreeze now, propylene glycol anhydrous antifreeze is really not competitive.
In fact, the car's cooling system is a closed system, the internal circulation will be much less consumption, so normally the consumption of antifreeze is very small, so the antifreeze does not need to be replaced too frequently.
The general model can be replaced once in 2 years or 40,000 kilometers! And now the new car produced in the past two years, the antifreeze replacement cycle has even reached 10 years or 200,000 kilometers. It can be seen that in fact, the replacement cycle of antifreeze is very long, and the owner only needs to replace it according to the deadline in the user manual.
In order to prevent the generation of excessive foam and reduce the heat exchange performance of the nonfreeze and engine components, confirm that the product is within the validity period of the product, a long-lasting antifreeze, valid for up to three years. If suspended solids are found in the antifreeze, the sediment or deterioration and discoloration should be replaced and cleaned in time.
Finally, it should be noted that different brands of antifreeze cannot be mixed due to differences in production formulas, because multiple chemical components are likely to react between them, resulting in the failure of antifreeze. If you want to replace the new antifreeze, you need to drain the original antifreeze before you can replace it.
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