Blue smoke in car exhaust is not only a problem for the engine

Let's take a look at a two-stroke engine. Why is it that "burning oil" is a normal phenomenon? To understand literally, as its name implies, the cycle of one work is the piston's upper and lower strokes. Its gas distribution system is different from that of the common four-stroke engine (valve). The two-stroke engine is directly on the opposite sides of the cylinder. Holes are staggered, and the crankcase and the air inlet of the engine are connected. After the work is done, the piston generates pressure to the cylinder. Knowing this, we can explain the problem of blue smoke by comparing the two types of engine lubrication systems.

For a two-stroke engine, its lubrication system does not have the oil pan common to four-stroke engines. why ? For four-stroke engines, because it has gas distribution mechanisms such as valves and camshafts, the lower crankshaft and the connecting rod are connected via a sliding bearing, all of which are dependent on the lubrication of the starting oil. In particular, the sliding bearing between the crankshaft and the connecting rod needs enough oil to lubricate it, otherwise it will pull the rotor and make the engine unable to work. For a two-stroke engine, not only is there no such valve train, but its crankshaft and connecting rod are connected by rolling bearings and can operate normally without oil. So for a two-stroke engine, the main effect of the oil is to lubricate the piston as it moves up and down. His engine oil is added directly to the fuel (gasoline).

In this way, we know that the 2-stroke blue butt of the butt is a normal thing. The engine oil burns and lubricates along with the engine's operation. Blue smoke will appear when the engine oil burns. Of course, it can be imagined that such an engine is definitely not environmentally friendly, which is one of the main reasons why two-stroke engines are gradually replaced by four-stroke engines. In Japan, the use of 2-stroke engines for motorcycles was stopped at the beginning of the 1990s because the pollution was too great. Even though the 2-stroke engine has many advantages, such as higher power, small size, light weight, high reliability, etc., it eventually loses its competitiveness in evolution. Now it is similar to the lawn mower, small generator, and motor boat. Waiting for blue smoke.

After talking about the 2-stroke engine, let's talk about the blue smoke problem of the 4-stroke engine. Similar to the reason that two-stroke engines emit blue smoke, four-stroke engines emit blue smoke because the oil is involved in combustion. To put it plainly, the oil is pumped into the combustion chamber, which is commonly known as engine oil. This situation is contrary to the original design for four-stroke engines. For four-stroke engines, the oil and fuel should be completely separated (also known as oil consumption), but if the exhaust gas is blue The point of smoke, it certainly belongs to the category of faults. Let's take a look at the structure of the engine. The engine oil is due to a problem with that component.

There are three rings at the head of the piston. The upper two rings are air rings to ensure the airtightness between the cylinder and the piston. The bottom one is the oil ring, which is used to scrape the oil that is adsorbed on the cylinder wall. The air ring is simply a circle, but it is not a full circle. It has a very small gap, which is convenient for installation. The second is to reserve space for thermal expansion. Just like the rails, there are joints. The openings of the two gas rings on the piston are arranged diagonally so as to minimize the stringing of oil. However, after a long period of wear, the gap will gradually increase, and at this time the engine oil will seep out of the two loops, which will result in oil soaking. Therefore, in general, oyster sauce is due to the engine to a certain number of years, or that the gas ring has reached its service life. Therefore, the main culprit is the excessive wear and tear of the piston ring on the piston head.

What is said above is the most common cause of blue smoke. It usually appears on old models that have been used for a long time. If it is a new car, it will cause blue smoke. Is this also caused by the aging of the air ring? Generally this possibility is minimal, unless there is a problem with the assembly, in general, the new car's air ring is less likely to have problems.

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