How to avoid engine damage caused by low speed pre ignition caused by lubricating oil?

The full name of low-speed pre-ignition (LSPI) is "low-speed high-torque pre-ignition", which refers to the spontaneous combustion of a mixture of fuel and engine oil before the normal ignition of the spark plug when the engine speed is not high (common 1000-2500 rpm range) and the torque output is high.

Low-speed pre-ignition is usually manifested as a serious knock on the cylinder, and the huge cylinder pressure generated in the pre-ignition state will directly impact the piston, piston ring and connecting rod, and a few cycles may directly cause piston cracking, piston ring fracture, connecting rod twisting, deformation and fracture, and finally cause the engine to die.

Are turbocharged direct-injection engines more susceptible to low-speed pre-ignition?

That's right. The direct injection engine injects fuel directly onto the cylinder wall, and the flash point of the oil remaining on the cylinder wall is diluted by the fuel. Driven by the turbine, the temperature in the cylinder soars, coupled with the low speed state to promote the uniform mixing of oil and fuel, direct injection (reduce the flash point) + turbine (increase the temperature) + low speed (promote mixing), which creates sufficient conditions for the occurrence of low speed pre-ignition.

How to prevent low-speed pre-ignition?

With the popularity of turbocharged direct-injection engines, many OEMs are evaluating solutions to the problem of low-speed pre-ignition, and it turns out that the key to solving the problem of low-speed pre-ignition lies in the formulation of the oil.

General Motors (GM) has introduced the second generation of the DEXOS1 specification, which focuses on evaluating the ability of motor oils to prevent low-velocity pre-ignition (LSPI) and random pre-ignition (SPI). This means that the oil must clearly demonstrate the ability to mitigate premature ignition events in order to be certified to the second-generation DEXOS1 standard.

The STUNT DX1 engine oil specially developed for GM's Buick, Chevrolet, Cadillac, GMC and other brand engines fully complies with the DEXOS 1 standard required by the second-generation GM engine, which can effectively reduce the risk of low-speed premature ignition of the engine.

At the same time, this oil also fully meets the needs of certain engine models of Ford, Kia, Honda, Hyundai, Mazda, Nissan and Toyota to protect against low-speed premature ignition, and can provide more comprehensive protection for the engines of American, Japanese and Korean vehicles.

LIQUI MOLY insists that every product is made in Germany and imported with original packaging.

Hello landlord, it is very simple, choose good quality lubricating oil, can reduce noise, efficient anti-wear, the focus is that the environmentally friendly lubricating oil can extend the life of the engine, the domestic Kunlun lubrication is good, I hope it will help you, hope, thank you.

It may be caused by misuse of engine oil, different engines have different requirements for engine oil, and the viscosity of engine oil also changes according to the change of the use environment! Generally speaking, turbocharged cars have higher requirements for oil type and oil grade, and Japanese and Korean cars prefer lower viscosity oil; It is recommended to read the manual to familiarize yourself with what type of engine oil you should use for your car!

Now that ordinary people have money, it is also common to buy a small car for transportation. Lubricating oil is indispensable when driving, and many car owners pick ordinary ones when refueling, after all, their beloved cars are also ordinary children, not picky eaters. However, if it is a better TGDI engine, the use of traditional lubricating oil is prone to problems such as low-speed pre-ignition and timing chain wear, so the engine damage caused by this is the most distressing for the owner.

However, I personally know that now the Tianrun series products launched by Kunlun Lubrication can perfectly solve all problems. The TGDI protection technology independently developed by Kunlun Lubrication has a leading advantage in the industry in the industry's authoritative third-party LSPI test engine, and the incidence of low-speed pre-ignition problem is "0", which has a leading advantage in the industry.

Premature ignition is a phenomenon in which the mixture is prematurely ignited by the heating source in the cylinder before it is ignited by the spark plug. Pre-ignition is characterized by a drop in power, unstable engine operation accompanied by a knocking sound (muffled sound), and high temperature overheating.

Detonation generally occurs after the ignition of the spark plug, which is generally caused by the abnormal compression ratio of the combustible mixed gas, and the cylinder pressure and temperature increase sharply after ignition, and the abnormal combustion of the gas produces a pressure shock wave, resulting in high-frequency noise and cylinder knocking phenomenon.

The pre-ignition and detonation of the engine have a great impact on the engine, which are caused by the combustible mixed gas in the cylinder and abnormal combustion.

It is generally believed that pre-ignition is the root cause of super detonation, and the main causes of pre-ignition are oil, sediment and thermal state in the cylinder, which can be summarized into two types of factors: engine design factors and operating parameters. This article introduces the research results of Dr. Qi Yunliang of Tsinghua University on the characteristics of super detonation under different causes of pre-ignition, that is, the influence of oil injection parameters, temperature and particle size of red-hot particles on pre-ignition and super detonation.

Low-speed pre-ignition is an anomaly that occurs in spark-ignited turbocharged engines, especially direct-injection engines, under heavy loads and low speeds. Low-speed pre-ignition can cause super knocking in small engines, which can cause serious damage to the engine, which is also a major concern for some OEMs.

The source of low-speed pre-ignition is unknown, and while OEMs can address this by adjusting the engine's operating conditions, this will reduce the engine's efficiency.

At present, people have identified the intricate factors such as engine technology, engine working conditions, fuel performance, lubricating oil performance, etc., which have a certain impact on low-speed pre-ignition. However, there is no consensus on the specific formation mechanism. Low-velocity pre-ignition is uncertain.

While low-speed pre-ignition is not completely avoidable in an engine, it is extremely difficult to get this phenomenon to occur in a controlled test engine.

In order to understand the role of lubricants on low-rate pre-ignition and the potential relationship between low-rate pre-ignition and combustion, Infineum used a combustion tester to detect the tendency of lubricants to spontaneously ignite.

The impact is large and can easily cause irreversible damage.

Generally, it is caused by the abnormal compression ratio of the combustible mixed gas, and the cylinder pressure and temperature increase sharply after ignition, and the abnormal combustion of the gas produces a pressure shock wave.

A phenomenon of abnormal combustion in gasoline engines. When the gasoline engine burns normally, the spark plug is ignited and prepared for a short ignition delay period to form a flame core near the electrode gap.

The impact of premature ignition and knocking on the engine is very large.

Instability is accompanied by a knocking sound (muffled sound) and high temperature overheating. The flammable gas mixture in the cylinder is caused by abnormal combustion.

The engine is unstable with a knocking sound (muffled sound) and high temperature overheating.

The efficiency of this speaker's engine may **.

Neither of these professional terms have been heard.

It is easy to wear out the starting gears.

Lubricating oil is a liquid or semi-solid lubricant used in various types of automobiles and mechanical equipment to reduce friction and protect machinery and processed parts, mainly playing the functions of lubrication, auxiliary cooling, rust prevention, cleaning, sealing and buffering. As long as it is applied between two objects in relative motion, and can reduce the friction and wear caused by the contact between two objects, it is lubricating oil. When the engine is working, a lot of dirt is generated.

For example, the sand and dust brought by inhaling the air, the carbon deposits formed after the combustion of the mixed gas, the gelatinous matter generated after the oxidation of the lubricating oil, and the metal chips generated by friction between the parts. These dirt will adhere to the friction surface of the machine, and if it is not cleaned, it will increase the wear of the machine. In addition, a large amount of gum can cause the piston ring to stick and get stuck and cause the engine to not function properly.

Therefore, these dirt must be cleaned in time, and this cleaning process is completed by the circulation of lubricating oil in the body. Therefore, the excellent cleaning ability of the lubricant is a necessary performance attribute. Among the domestic lubricating oils, Kunlun lubricated Tianrun series has excellent cleaning performance.

It not only has advanced TGDI protection technology, but also reduces the occurrence of low-speed premature ignition of turbocharged direct injection engines and protects turbocharged direct injection engines. At the same time, it improves friction properties, increases power, and provides wear resistance up to 90% above the standard limit, allowing it to extend engine life. Therefore, it belongs to the all-round high-performance fully synthetic motor oil.

In the process of using lubricating oil, there will be some carbon particles and smoke generated by fuel combustion into it, and some dust in the air will also enter the oil, coupled with some acidic substances produced by the high-temperature oxidation of the lubricating oil itself, these substances will generate carbon deposits and sludge in the long run, blocking the lubricating oil circuit and causing mechanical lubrication failure. The ability to inhibit carbon deposits and sludge depends on the quality and proportion of the cleaning and dispersing agent in the lubricating oil.

Keeping the engine clean is one of the important roles of engine lubricants. About half of the composition of oil additives is a detergent and dispersant. It cleans off dirt such as carbon deposits inside the engine and evenly distributes it in the oil.

In other words, the effect of the cleaning dispersant is not only clean, but also good dispersion, which can disperse sludge and particles in the oil, inhibit and reduce the formation of deposits, and make the inside of the engine clean. In addition, the detergent dispersant neutralizes the acids in the oil. The function of the cleaning and dispersing agent can be summarized as washing, dispersing, solubilizing, and neutralizing.

Because the cleaning of the engine components helps to keep the engine in good condition. If the engine parts are dirty, the oil may not properly lubricate and protect the engine, and the accumulation of dirt can lead to premature engine failure. Therefore, it is particularly important to choose a lubricant with excellent cleaning ability.

Kunlun's KR series has passed the GM and Ford low-speed pre-ignition tests, the GM dexos1 (2nd generation) performance test, the turbine deposit test, and the API SN performance test program IVA test. It can effectively clean our engines and is the first choice for domestic lubricants.

The reason why the car needs to fill the engine oil is mainly to form an oil film on the friction parts of the engine through the sleeve to play a lubricating role, so that the dry friction between the metals becomes the liquid friction between the oil layers, reducing the friction resistance, reducing the wear of the parts, and at the same time, the oil also plays a role in cooling, cleaning, sealing, rust prevention and eliminating impact loads. However, low-quality motor oil not only does not play these roles, but also has many negative effects. This is because low-quality motor oils have the following common characteristics.

The temperature characteristics and antioxidant capacity are poor. The low temperature of inferior engine oil is too large, which makes the time between the oil pumping to the various friction parts of the engine longer, resulting in the dry friction time of the engine being longer; The high temperature viscosity is too thin to form an oil film with sufficient strength. These will lead to increased engine wear.

At the same time, inferior engine oil is also very easy to oxidize and deteriorate in a high-temperature environment, losing its function.

Poor quality motor oil has poor cleanliness and dispersibility. Inferior engine oil not only can not suck the dust in the air and clean off the carbon deposits formed after combustion when the engine is working, but it is easy to oxidize to form gum, and the combination with other impurities will lead to the formation of more carbon deposits, resulting in poor lubrication, aggravated wear, increased fuel consumption, decreased power, and in serious cases, it will block the oil passage, resulting in cylinder pulling, tile and other consequences.

Inferior engine oil has poor acid resistance and neutralization of acidic substances, and its own sulfur content and other components are high. During the operation of the engine, every time LL gasoline is burned, LL water will be generated, and when the water that fails to be removed and evaporated reacts with the sulfide generated after the combustion of fuel oil to form acid, resulting in acid corrosion of the engine.

Therefore, inferior engine oil is very harmful to the automobile engine, and it is not possible to blindly use inferior engine oil for cheapness.

The poor quality of automobile engine oil may lead to a decrease in power, an increase in fuel consumption, and damage to the three-way catalysis. The lubricating oil in the engine crankcase has a lubricating effect on the crankshaft, but at the same time of lubrication, it will also produce great resistance to the crankshaft rotating at high speed, so there will be an optimal oil level height for the engine, at this height, that is, the crankshaft can be fully lubricated and will not produce too much resistance to the rotation of the crankshaft, this height should be the middle line of the dipstick scale. Of course, within a certain range above and below the center line, the impact will not be very large, so there is also an upper and lower limit of the lubricating oil level height - that is, the upper and lower limits of the oil scale.

In addition, the quality requirements for engine oil are also very important, the domestic engine oil Kunlun lubricated Tianrun series is a representative of the domestic engine oil, it uses advanced TGDI protection technology to reduce the occurrence of low-speed premature ignition of turbofan direct injection engine, protect the turbocharged direct injection engine, worry-free and safer, PetroChina major gas stations have sold quality.

Inferior engine oil has great harm to the car:

1. Inferior car oil will dramatically reduce the service life of the engine. When the engine is running, the piston body and the cylinder wall are rubbed, and the phenomenon of "pulling the cylinder" occurs and metal chips are generated.

2. Inferior car oil will make the maintenance of the car frequent. Because its indicators are not up to standard, easy to deteriorate, if the owner does not pay attention to maintenance when driving, without regular inspection, the deteriorated oil will cause greater damage to the engine, such as oil blockage, cylinder pulling and other consequences.

3. Inferior automotive engine oil will lead to insufficient power of the car. It will increase the relative fuel consumption of the car, and it is easy for the engine oil to be mixed into the combustion chamber, resulting in the exhaust tailpipe "blue smoke, oil pressure drops sharply when accelerating sharply, etc."