Why is the turbine engine easy to burn oil?

Compared with ten years ago, the biggest change may be that the displacement has become smaller than ten years ago. Therefore, in order to draw power, the turbocharged engine is now used to use a limited displacement. The amount of air intake, increase the engine power. At present, the mainstream 1.5T engine is generally comparable to the naturally aspirated engine in the output power, and the torque is often larger.

浅谈涡轮发动机为何容易烧机油?

So many car owners now have a soft spot for turbine car types. However, it has always been accompanied by the common problem of turbine models, but it is not the patent of the turbine car. There is also a burning oil for self -sucking models. For example, the famous Volkswagen burning oil has become a phenomenon. If you observe it carefully, you can find that it is mainly the supercharged models under his His Majesty.

浅谈涡轮发动机为何容易烧机油?

This is why the Japanese car’s mouth is good in some sense, because they less oil burning oil, which is related to the basics of turbocharging. However, when Honda began to use turbocharged, the phenomenon of burning oil quickly occurred. Although the performance of Honda’s “motor and throttle” incident, although the amount of oil is significantly higher than the upper limit of the oil marker, it is essentially a manifestation of burning oil. This is the engine in the work of the engine. The increase in Honda’s oil is actually more terrible than the simple burning oil.

Therefore, the Honda CR-V owner’s collective rights protection can be understood. Although I feel that the power of the power is not suitable, after all, the feelings should spend more money at first, and it is not good to provoke the unhappy.

principle:

In fact, the principle is very simple. The main reason for burning oil is when using turbine for supercharged. The work pressure and temperature of the burning room are much higher than the naturally aspirated engine. Under the action of the oil, the oil is needed to cool, and the supercharged air will also bring the oil into the burning room. These two basic structural principles make the oil have the opportunity to gasify and enter the cylinder burning room through the cylinder wall, and burn it with fuel.

The principle of turbine is to use exhaust gas to push the turbine fan blades to rotate at a high speed to generate high -pressure air into the cylinder to participate in the combustion. Therefore, the essential turbocharged engine is to supplement more oxygen to the combustion room.

But we all know that the working speed of the turbocharger rotor is very high, so common mechanical rolling needles or pearl bearing cannot withstand such a high speed at all. Therefore, the turbocharger must use a full floating bearing, which requires lubrication and cooling. This You need to use motor oil.

In order to reduce friction and ensure that the turbine runs at a high speed, this part of the lubricating oil seal cannot be too tight. There must be a certain gap. If there is a gap, a small amount of oil will enter the turbine at both ends through the oil seal. Therefore Later, organic oils are often found. This is a natural phenomenon.

Therefore, the turbine must be burned. The difference is just a question. Of course, it is like the public. It can only be said that we have feelings anyway, what are you afraid of!

What are the problems with burning oil?

The standard defined in my country is that 1,000 kilometers must not exceed 0.5L of oil consumption. Once it exceeds the phenomenon of “burning oil”, the first is that the vehicle’s oxygen sensor will be damaged too quickly, resulting in the increase in carbon deposits in the burning room, unstable idleness, acceleration weakness, powerlessness , Rising fuel consumption and excessive exhaust emissions; more severe when the engine lubrication will insufficient, making the engine cause difficult damage or even scrap, resulting in a significant increase in maintenance costs.

Is it because of wear?

Most people think that the oil burning oil is caused by the wear of the piston ring, but it is not necessarily the case. Let’s take the engine first.

Most engines now use aluminum alloy cylinders, but although aluminum alloy is light weight and heat conductivity can be imaginative, the expansion coefficient of the material of aluminum alloy is high. Therefore, in the design and manufacturing of the aluminum alloy engine, there must be some gaps between each component to prevent the components from being damaged after high temperature expansion, such as the piston and the cylinder.

But this gap is not casual. The piston between the engine piston and the cylinder between the cylinder is extremely important technical parameters. If the gap between the cylinder is too large and the seal is poor, it will leak air and oil, commonly known as knocking tank, and the power will decrease; if the gap is too small, the piston skirt will have no room for expansion. The squeezing strength (usually 4.9MPa-9.8MPa) that the oil film can withstand, the lubricant film will be destroyed, and it is easy to pull the cylinder.

Therefore, the burning oil may not be due to wear, but often the design of the cylinder is not very good, and the piston ring of the German car is better. If the toughness is good, the tension will insufficient tension. The wear caused by the cylinder wall, but at the same time, the gap is relatively large. When the gap is large, it is easy to pass the gasification of gasification. Therefore, it is the main reason for the consumption of the oil under high temperature and high pressure to be prone to gasification. This is essentially a craft problem!

浅谈涡轮发动机为何容易烧机油?

How to solve the oil burning oil?

Cold car burning oil:

When the cold car was started, the engine exhaust pipe began to take blue smoke, but it was normal after the hot car. That shows that the valve oil seal is aging, and there is no problem with the piston ring. After the valve oil seal is aging, the rubber will be stiff due to the decrease in temperature, which will not be completely sealed. The oil will leak from the valve to the burning room from the valve.

Solution: Just replace the valve oil seal.

Hot car burning oil:

When the car still discharges blue smoke at normal temperature, this shows that the piston ring has a poor seal. Due to poor sealing, the oil was directly leaked into the burning room through the piston ring under the action of the oil pump. The cause of this phenomenon is only a few types: excessive cylinder gaps, aging materials, excessive carbon accumulation, cylinder set wear, etc.

Solution: 1. Da Xiu, replace everything that should be replaced; 2. If the engine oil is burned during hot cars, but the burning is not too serious, you can just just change the piston rings, which is cheaper than large repair.

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