What is the principle of why the exhaust manifold is crooked?
Product Overview
WhycarExhaust manifoldAlways distorted? Yes, really not! Whether it is a structural factor or a main factor or other additional factors, the manifold cannot constitute a straight structure. Although the exhaust manifold
Key Features
- Meet or exceed OEM requirements
- 2 years warranty
- Strict quality control
- Complete testing from material to product
Quality Assurance
Chemical Analysis
Hardness Test
Surface Test
Dimension Check
Salt Fog Test
Fatigue Test
Fast worldwide shipping Quality guaranteed
WhycarExhaust manifoldAlways distorted? Yes, really not! Whether it is a structural factor or a main factor or other additional factors, the manifold cannot constitute a straight structure. Although the exhaust manifold is not part of the engine structure, its purpose seems to be to discharge exhaust gas, which does not seem so important. In fact, because the exhaust manifold is connected to the exhaust port of the engine and directly contacts the high-temperature and high-pressure exhaust gas, the effectiveness and stability of its work will directly affect the performance of the engine.Why is the exhaust manifold crooked?
Since the engine is to run effectively, it must ensure smooth oil absorption and exhaust. Therefore, oil absorption andexhaust pipeThe design of the road will inevitably affect the efficiency of the engine's oil absorption and exhaust, thereby affecting the engine's performance and fuel consumption.
Exhaust pipes are generally divided into exhaust manifold, mid-end treatment and tailsilencerthree parts. Its main functions include exhaust, noise reduction, shock absorption and muffler. Next we will focus on the characteristics and principles of the exhaust manifold. WhycarExhaust manifoldAlways distorted? Yes, really not! Whether it is a structural factor or a main factor or other additional factors, the manifold cannot constitute a straight structure. Although the exhaust manifold is not part of the engine structure, its purpose seems to be to discharge exhaust gas, which does not seem so important. In fact, because the exhaust manifold is connected to the exhaust port of the engine and directly contacts the high-temperature and high-pressure exhaust gas, the effectiveness and stability of its work will directly affect the performance of the engine.Why is the exhaust manifold crooked?
Since the engine is to run effectively, it must ensure smooth oil absorption and exhaust. Therefore, oil absorption andexhaust pipeThe design of the road will inevitably affect the efficiency of the engine's oil absorption and exhaust, thereby affecting the engine's performance and fuel consumption.
Exhaust pipes are generally divided into exhaust manifold, mid-end treatment and tailsilencerthree parts. Its main functions include exhaust, noise reduction, shock absorption and muffler. Next we will focus on the characteristics and principles of the exhaust manifold.
Engine characteristics determine the independent arrangement of exhaust manifolds
Why the exhaust manifold is bent? This relates to its working conditions and functions.we knowpistonThe reciprocating engine is operated in a given sequence, that is, each cylinder has a given working sequence. As a result, the engine exhaust stroke must also meet a certain sequence, so each cylinder will not be completely synchronized during the exhaust process. Of course, the smaller the number of cylinders, the smaller the ignition interval angle,CrankshaftThe smaller the angle, the longer the overlap time of each cylinder exhaust, but because each cylinder has four strokes, that is to sayCrankshaftIt can rotate 180 degrees to do a job, so even a 16-cylinder engine cannot allow two cylinders to do the same stroke at the same time. Similarly, if the ignition has an interval angle, the exhaust must also be there, because each cylinder is 180 degrees to stroke.
Therefore, due to the characteristics of the engine exhaust interval, it is impossible to exhaust at the same time. If the exhaust is not controlled at the same time, it will cause exhaust turbulence. The function of the exhaust manifold is coordination. What happens if the exhaust manifold is converted to a thick pipe? The most direct effect is that the exhaust gas discharged by each cylinder will interfere with each other, forming a strong exhaust vortex (positive and negative pressure waves).On the one hand, the exhaust isValveBefore closing, it will return to the cylinder. On the other hand, the negative pressure wave will increase the scavenging coefficient and affect the normal operation of the engine. The pressure wave formed by the continuous impact of the high-temperature vortex may cause resonance and resonance. The high-temperature exhaust gas also advances the counterflow cylinder, pre-ignites the fuel injection, and knocks the knock cylinder. (Imagine a situation where the exhaust gas of seven or eight hundred degrees has been hovering around the exhaust valve of the engine).
For example, you can better understand: For example, the ignition sequence of an ordinary four-cylinder engine is 1-3-4-2, its exhaust sequence is 2-1-3-4, and the interval time is 180 degrees of crankshaft rotation. In other words, when the crankshaft first rotates at 0 to 180 degrees, two cylinders are exhausted, one cylinder is ignited, three cylinders are compressed, and four cylinders are taken in. Therefore, the exhaust should be discharged as soon as possible after the exhaust, because almost every Each engine now has a certain ignition advance angle (that is, the intake and exhaust valves are open). Close early and close late to improve intake efficiency and increase exhaust effect). If the exhaust gas of the cylinder 2 is not discharged as quickly as possible, exhaust gas will inevitably be generated. Rampant. However, the exhaust gas of the No. 2 cylinder has not been discharged from the No. 1 cylinder, and it has come out again. Once convection occurs, a vortex will form. This high-temperature vortex is quite harmful. Then the 3 cylinders, 4 cylinders and 1 cylinder reciprocate. If the engine is 2400 rpm or 40 rpm and all cylinders are exhausted 80 times per second, the convection of exhaust gas generated under this effective condition will make the engine unable to work normally.
Therefore, straight cylinders cannot be used in the exhaust manifold, and a scientific "drainage" design must be carried out. In terms of structure, the best method is to connect the cylinder and the exhaust manifold to ensure that the exhaust process does not interfere with each other. Then, exhaust the exhaust pipe as quickly as possible, such as bending down and equal length, such as 4:1 and 4, 4, 4, and so on. The length, roughness, curvature, smoothness, material, and assembly points of each manifold are not random.
In addition, its design should also consider the comprehensive conditions of back pressure, spatial layout, noise, and vibration.
The engine compartment is so big. Many models have front-end engines, and the exhaust manifold is located in the front of the engine. The manifold must be turned 180 degrees to extend to the rear, thus leaving less space. The curved design manifold has a better vibration and noise reduction effect than the DC shape.Can pass multiplebufferReduce noise and vibration. Reasonable exhaust back pressure is conducive to low-speed engine operation, but the exhaust manifold needs to increase the exhaust volume to reduce the impact of back pressure. The exhaust pressure in the exhaust pipe and at the end should also be a scientific and reasonable "stop" setting, because energy saving and emission reduction is the current trend.
Three-way catalyst and mid-end muffler
The main structure of three-way catalysis is honeycomb ceramics. There are special precious metals on the ceramic surface. When the superheated exhaust gas passes through three-way catalysis, CH, NO and carbon monoxide are catalytically reduced to harmless carbon dioxide, water and nitrogen. Its main function is to protect the environment and reduce emissions. In addition, it also has a certain cooling effect on the exhaust gas. Three-way catalysis is usually located at the assembly point of the exhaust manifold, with the purpose of filtering the exhaust gas of each cylinder. The role of the muffler is to reduce noise. For family cars, displacement and power do not allow us to "blow up the streets." The muffler is very helpful for driving comfort.
Since the engine is to run effectively, it must ensure smooth oil absorption and exhaust. Therefore, oil absorption andexhaust pipeThe design of the road will inevitably affect the efficiency of the engine's oil absorption and exhaust, thereby affecting the engine's performance and fuel consumption.
Exhaust pipes are generally divided into exhaust manifold, mid-end treatment and tailsilencerthree parts. Its main functions include exhaust, noise reduction, shock absorption and muffler. Next we will focus on the characteristics and principles of the exhaust manifold. WhycarExhaust manifoldAlways distorted? Yes, really not! Whether it is a structural factor or a main factor or other additional factors, the manifold cannot constitute a straight structure. Although the exhaust manifold is not part of the engine structure, its purpose seems to be to discharge exhaust gas, which does not seem so important. In fact, because the exhaust manifold is connected to the exhaust port of the engine and directly contacts the high-temperature and high-pressure exhaust gas, the effectiveness and stability of its work will directly affect the performance of the engine.Why is the exhaust manifold crooked?
Since the engine is to run effectively, it must ensure smooth oil absorption and exhaust. Therefore, oil absorption andexhaust pipeThe design of the road will inevitably affect the efficiency of the engine's oil absorption and exhaust, thereby affecting the engine's performance and fuel consumption.
Exhaust pipes are generally divided into exhaust manifold, mid-end treatment and tailsilencerthree parts. Its main functions include exhaust, noise reduction, shock absorption and muffler. Next we will focus on the characteristics and principles of the exhaust manifold.
Engine characteristics determine the independent arrangement of exhaust manifolds
Why the exhaust manifold is bent? This relates to its working conditions and functions.we knowpistonThe reciprocating engine is operated in a given sequence, that is, each cylinder has a given working sequence. As a result, the engine exhaust stroke must also meet a certain sequence, so each cylinder will not be completely synchronized during the exhaust process. Of course, the smaller the number of cylinders, the smaller the ignition interval angle,CrankshaftThe smaller the angle, the longer the overlap time of each cylinder exhaust, but because each cylinder has four strokes, that is to sayCrankshaftIt can rotate 180 degrees to do a job, so even a 16-cylinder engine cannot allow two cylinders to do the same stroke at the same time. Similarly, if the ignition has an interval angle, the exhaust must also be there, because each cylinder is 180 degrees to stroke.
Therefore, due to the characteristics of the engine exhaust interval, it is impossible to exhaust at the same time. If the exhaust is not controlled at the same time, it will cause exhaust turbulence. The function of the exhaust manifold is coordination. What happens if the exhaust manifold is converted to a thick pipe? The most direct effect is that the exhaust gas discharged by each cylinder will interfere with each other, forming a strong exhaust vortex (positive and negative pressure waves).On the one hand, the exhaust isValveBefore closing, it will return to the cylinder. On the other hand, the negative pressure wave will increase the scavenging coefficient and affect the normal operation of the engine. The pressure wave formed by the continuous impact of the high-temperature vortex may cause resonance and resonance. The high-temperature exhaust gas also advances the counterflow cylinder, pre-ignites the fuel injection, and knocks the knock cylinder. (Imagine a situation where the exhaust gas of seven or eight hundred degrees has been hovering around the exhaust valve of the engine).
For example, you can better understand: For example, the ignition sequence of an ordinary four-cylinder engine is 1-3-4-2, its exhaust sequence is 2-1-3-4, and the interval time is 180 degrees of crankshaft rotation. In other words, when the crankshaft first rotates at 0 to 180 degrees, two cylinders are exhausted, one cylinder is ignited, three cylinders are compressed, and four cylinders are taken in. Therefore, the exhaust should be discharged as soon as possible after the exhaust, because almost every Each engine now has a certain ignition advance angle (that is, the intake and exhaust valves are open). Close early and close late to improve intake efficiency and increase exhaust effect). If the exhaust gas of the cylinder 2 is not discharged as quickly as possible, exhaust gas will inevitably be generated. Rampant. However, the exhaust gas of the No. 2 cylinder has not been discharged from the No. 1 cylinder, and it has come out again. Once convection occurs, a vortex will form. This high-temperature vortex is quite harmful. Then the 3 cylinders, 4 cylinders and 1 cylinder reciprocate. If the engine is 2400 rpm or 40 rpm and all cylinders are exhausted 80 times per second, the convection of exhaust gas generated under this effective condition will make the engine unable to work normally.
Therefore, straight cylinders cannot be used in the exhaust manifold, and a scientific "drainage" design must be carried out. In terms of structure, the best method is to connect the cylinder and the exhaust manifold to ensure that the exhaust process does not interfere with each other. Then, exhaust the exhaust pipe as quickly as possible, such as bending down and equal length, such as 4:1 and 4, 4, 4, and so on. The length, roughness, curvature, smoothness, material, and assembly points of each manifold are not random.
In addition, its design should also consider the comprehensive conditions of back pressure, spatial layout, noise, and vibration.
The engine compartment is so big. Many models have front-end engines, and the exhaust manifold is located in the front of the engine. The manifold must be turned 180 degrees to extend to the rear, thus leaving less space. The curved design manifold has a better vibration and noise reduction effect than the DC shape.Can pass multiplebufferReduce noise and vibration. Reasonable exhaust back pressure is conducive to low-speed engine operation, but the exhaust manifold needs to increase the exhaust volume to reduce the impact of back pressure. The exhaust pressure in the exhaust pipe and at the end should also be a scientific and reasonable "stop" setting, because energy saving and emission reduction is the current trend.
Three-way catalyst and mid-end muffler
The main structure of three-way catalysis is honeycomb ceramics. There are special precious metals on the ceramic surface. When the superheated exhaust gas passes through three-way catalysis, CH, NO and carbon monoxide are catalytically reduced to harmless carbon dioxide, water and nitrogen. Its main function is to protect the environment and reduce emissions. In addition, it also has a certain cooling effect on the exhaust gas. Three-way catalysis is usually located at the assembly point of the exhaust manifold, with the purpose of filtering the exhaust gas of each cylinder. The role of the muffler is to reduce noise. For family cars, displacement and power do not allow us to "blow up the streets." The muffler is very helpful for driving comfort.
| Material | High-tensile steel / forged aluminum |
|---|---|
| Finish | E-coat / powder paint / zinc plating |
| Standards | IATF / ISO-based process control |
| Warranty | 24 months |
| MOQ | 50-100 pcs per reference |
| Lead Time | 25-35 days after PO |
Passenger Cars
SUVs & Pickups
Commercial Vehicles
Off-road Vehicles
Compatible Brands:
Toyota, Honda, Nissan, BMW, Mercedes-Benz, Ford, Hyundai, Kia, Volkswagen, Land Rover, and more...
Request a Quote
Just for B2B inquiries, no retail please. We'll get back to you within 24 hours.
Related Products
