Expert tips on customs data usage

List of catalogs in this article:

• 1, Why is the air pressure in the cylinder greater than the external air pressure after the engine intake?
• 2, What is the engine cylinder pressure?
• 3
  、 Is it high pressure or low pressure in the engine cabin when the car is running?
• 4, What's the matter with insufficient engine air pressure?

Why is the air pressure in the cylinder greater than the external air pressure after the engine intake?

1. This statement is wrong. 1. After the intake of an ordinary engine, the air pressure in the cylinder is lower than that in the outside world. This ratio is called the "inflation coefficient" of the engine.

2. Because the naturally aspirated engine air relies on the negative pressure generated by the piston to inhale the mixed gas, the pressure in the cylinder is always less than the atmospheric pressure. A cylindrical metal part that guides the piston to move in a straight line in the cylinder.

3. When inhaling,The gasoline engine enters the cylinder with combustible mixture, the diesel engine enters the cylinder with air, and the oil plays a lubricating role, which is not the same as them.

4. Compression ratio: It is the degree to which the engine mixed gas is compressed, which is expressed by the ratio of the total cylinder volume before compression to the compressed cylinder volume (i.e. combustion chamber volume).

5. At the end of the compression stroke and the workstroke, the air pressure is higher than the atmospheric pressure.

6. When the piston moves to the right, the cylinder volume increases. When the gas pressure drops to atmospheric pressure, the intake valve opens and begins to inhale. Curve 4-1 is the intake process. As the piston moves to the left, the air is constantly filled into the cylinder. When the piston reaches the far right, the intake valve closes and the intake ends. The piston compressor completes a cycle.

What is the engine cylinder pressure?

1. The engine cylinder pressure is about 1000KPA. Generally, gasoline engines are about 1000KPA, diesel engines are about 2000KPA, the cylinder pressure of most electric injection engines is between 1200kPa and 1400kPa, and the cylinder pressure of a few engines with high compression ratio is above 170KPA. In the combustion chamber of the car, there is a piston driven by the pressure or expansion force of the working fluid.

2. The cylinder pressure of gasoline engines is generally 8~11bar, and the cylinder pressure of diesel engines is generally 12~16bar, subject to the reference manual. The cylinder pressure refers to the size of the cylinder shrinkage pressure when the piston reaches the upper stop point of the compression end.

3. The standard cylinder pressure of gasoline engine is 8~12~16bar, and the standard cylinder pressure of diesel engine is 12~16bar.A cylinder means that there is a piston in the combustion chamber of a car, driven by the pressure or expansion force of the working fluid.

Is it high pressure or low pressure in the engine cabin when the car is running?

1. When the train is running at high speed, the air pressure in the car is relatively low. RootAccording to the principle of fluid dynamics, when an object moves at high speed, the air in front will be compressed, while the air in the back will be thin. In the process of running the bullet train, the air outside the car is thinner than the air inside the car, and the air pressure inside the car will be relatively reduced.

2. When the car is driving at high speed, according to fluid dynamics, the speed is high and the pressure is small. The air in the car is stationary relative to the car body, so the pressure outside the car is low.

3. In this way, when slowing down, the air in the car has inertia, which will flow quickly and the air pressure in the car will drop. When accelerating, the air in the car also has inertia. At this time, the air flow speed outside is fast and the air pressure is low. The air pressure is stable at uniform speed.

What's the matter with insufficient engine air pressure?

1,If the air pressure of the car engine is insufficient, it means that the cylinder is leaking. Specifically, whether it is a spark plug leak, a piston ring leak or a valve leak, we need to use an unconventional method to judge. You can remove a little oil from the spark plug. If it is normal, it is said that it is not normal because of my prosperous problem. It's just a problem with the valve.

2. Reasons and solutions for insufficient engine oil pressure: If the oil runs for too long, it will cause it to be dirty or sticky, resulting in the oil pump not being able to inhale and pump out the oil smoothly, resulting in too low oil pressure.

3. Due to non-maintenance on schedule, due to oil deterioration and poor oil filter element, the oil quality of different grades of lubricating oil will change during use. After a certain mileage, the performance of the vehicle will deteriorate, which may bring various problems to the engine.