Friends who drive, especially young people, may have a soft spot for turbo cars. The turbo engine with small displacement and high power not only brings sufficient power, but also controls exhaust emissions well. Under the premise of not changing the exhaust volume, the turbocharger is used to increase the intake air volume of the engine and improve the engine power. A 1.6T engine has a higher power output than a 2.0 naturally aspirated engine, but has lower fuel consumption.
However, in addition to the advantages of sufficient power, environmental protection and energy saving, the disadvantages are also obvious, such as the phenomenon of burning engine oil reported by many car users. Many turbo car owners have such troubles. Some serious ones can consume more than 1 liter of oil for almost 1,000 kilometers. In contrast, this is rarely the case with naturally aspirated engines. Why is that?
There are two main types of engine block materials for automobiles, cast iron and aluminum alloy, each with its own advantages and disadvantages. Although the cast iron engine has a smaller expansion rate, it is heavier, and its heat dissipation performance is worse than that of an aluminum alloy engine. Although an aluminum alloy engine is light in weight and has good heat conduction and heat dissipation, its expansion coefficient is higher than that of cast iron materials. Nowadays, many engines use aluminum alloy cylinder blocks and other components, which require that some gaps be reserved between the components during the design and manufacturing process, such as between the piston and the cylinder, so as to avoid the extrusion of the components due to high temperature expansion damage.
The cylinder matching clearance between the engine piston and the cylinder is an extremely important technical parameter. Engines of different models, especially modern enhanced engines, have different gaps between pistons and cylinders due to their different structures, materials and other technical parameters. When the engine starts, when the water temperature and the engine temperature are still relatively low, a small part of the oil will flow into the combustion chamber through these gaps, which will cause the oil to burn.
A turbocharger is mainly composed of a pump wheel and a turbine, and of course some other control elements. The pump wheel and the turbine are connected by a shaft, that is, the rotor. The exhaust gas from the engine drives the pump wheel, and the pump wheel drives the turbine to rotate. After the turbine rotates, the intake system is pressurized. The rotating speed of the rotor is very high, which can reach hundreds of thousands of revolutions per minute. Such a high rotating speed makes common mechanical needle roller or ball bearings unable to work. Therefore, turbochargers generally use full floating bearings, which are lubricated and cool down.
In order to reduce friction and ensure the high-speed operation of the turbine, the lubricating oil seal of this part should not be too tight, so a small amount of oil will enter the turbine at both ends through the oil seal, and then enter the intake pipe and exhaust pipe. This is the opening of the intake pipe of turbocharged cars. The cause of the organic oil was found later. The tightness of the oil seal of the turbocharger of different cars is different, and the amount of oil leakage is also different, which results in different amounts of oil burned.
But this does not mean that the turbocharger is evil. After all, the invention of the turbocharger greatly reduces the volume and weight of the engine with the same power, improves gasoline combustion efficiency, reduces fuel consumption and reduces emissions. In order to further improve the performance of the car it has laid an indelible foundation. It can be said that its invention has epoch-making significance and is a milestone for today’s high-performance cars to enter ordinary home users.
How to avoid and reduce the phenomenon of burning oil?
The following few good habits are very! impotent！
Choose High Quality Lubricants
Generally, the turbocharger will start when the engine speed reaches 3500 rpm, and it will increase rapidly until 6000 rpm. The higher the engine speed, the stronger the shear resistance of the oil is required. Only in this way can the lubricating ability of the oil not decrease at high speeds. Therefore, when choosing engine oil, you should choose high-quality engine oil, such as high-grade fully synthetic engine oil.
Regular oil change and regular maintenance
In fact, a large number of turbo vehicles burn oil because the owner did not change the oil on time, or used inferior oil, which caused the floating main shaft of the turbine to not lubricate and dissipate heat normally. The seal is damaged, causing oil leakage. Therefore, during maintenance, we must pay attention to checking the turbocharger. Including the tightness of the turbocharger sealing ring, whether there is oil leakage at the lubricating oil pipe and joints, whether there is abnormal sound and abnormal vibration of the turbocharger, etc.
Take precautions and check the oil dipstick frequently
If you suspect that the oil consumption of your car is abnormal, you should check the oil dipstick frequently. When checking, stop the car first, tighten the handbrake, and start the engine. When the car engine reaches normal operating temperature, turn off the engine and wait for a few minutes, so that the oil can flow back to the oil pan. Take out the oil dipstick after the oil has been left, wipe it clean and put it in, then take it out again to check the oil level, if it is between the marks on the lower end of the oil dipstick, it means the oil level is normal. If it is below the mark, it means that the amount of engine oil is too low, and if there is too much oil, the amount of engine oil will be above the mark.
Keep the turbocharger clean
The turbo design and manufacturing process are precise, and the working environment is harsh. Therefore, it has very high requirements for the cleaning and protection of lubricating oil, and any impurities will cause great frictional damage to components. The matching gap between the rotating shaft and the shaft sleeve of the turbocharger is very small, if the lubricating ability of the lubricating oil decreases, the turbocharger will be scrapped prematurely. Secondly, it is necessary to clean or replace the air filter on time to prevent impurities such as dust from entering the high-speed rotating supercharger impeller.
Slow start and slow acceleration
When the cold car starts, various parts are not fully lubricated. At this time, if the turbocharger starts, it will increase the chance of wear. Therefore, after starting the vehicle, the turbo car cannot step on the accelerator pedal quickly. It should run at idle speed for 3~5 minutes first, so that the oil pump has enough time to deliver the oil to various parts of the turbocharger. At the same time, the temperature of the oil rises slowly and the fluidity is better, so that the turbocharger can be fully lubricated. .
Post time: 08-03-23