What is the difference between two exhaust pipes and one car exhaust pipe? Which is more advanced?

A friend of the bag, it has a quirk, no matter what occasion you see a fresh car or a modified car, you like to look at the exhaust pipe behind the butt of the car, and I wonder if I can see a "chrysanthemum". Can see what is famous, and later I told him some knowledge of the exhaust, since then he has upgraded to the bottom of the drilling rig.

What exactly did you tell him? Share with your friends today

What is the exhaust pipe?

First of all, we have to explain why the exhaust pipe is used. The work of the engine requires the intake of air. The exhaust gas from the engine is exhausted. The exhaust pipe is used to discharge the exhaust gas. Exhaust system is mainly divided into head section, middle section, tail section, and most of the three, as shown below:

The function of the exhaust pipe is not only simple to discharge the exhaust gas, but it also has the function of purifying the exhaust gas, reducing noise, reducing vibration, and controlling the power range.

Next, we start with the tail section of the exhaust gas that we see at first glance. Many small partners will unconsciously think that the more vent holes are exposed, the greater the displacement of the car, is this not the case?

Exhaust tail section

The tail section of the exhaust includes pipes, silencers, and tailpipes (vents), which function to reduce noise and to decorate.

Like the double out of some performance cars; the middle three out on the Ferrari 458; the double double out on the Nissan GTR; the middle out on the Pagani. These are typical examples of large-displacement and multi-throat throats.

Generally speaking, the number of tailpipes depends on the size of the vehicle's displacement. The larger the displacement is, the more exhaust gas is exhausted. Therefore, the larger the displacement, the more and more thicker the tailpipe is, but this is not absolute!

For example, some vehicles with small displacement can also see double exits, but this is not the same as large displacement vehicles. Large-displacement vehicles are mostly two pipelines or a thick pipeline, which leads to two small silencing packages and then to the double outlet throat.

Performance car double out

The small-displacement car is a single pipe and relatively thin, leading to a large silencer package is divided into two out tail throat, more decorative effect.

Small displacement car double out

Of course there are special, such as the unilateral single out of the old Mitsubishi EVO, the unilateral single out of the old Subaru STI, the unilateral out of the old GTR, the single out of the Megana RS, but their tail section Roads are thick enough and silence packages are also relatively small, so they will not affect the flow of exhaust gases. After all, they are mainly performance-based.

The silencer package at the end of the exhaust not only reduces the noise, but also can change the air flow through the internal design to achieve the purpose of changing the sound of the exhaust. This is also the reason why the unique sound is generated by the exhaust.

Refit Tips: Some junior gamers will modify the exhaust tail to change the appearance and sound.

Mid-exhaust

The middle section of the exhaust includes pipelines and silence packages. The middle section is the main working area for reducing noise, reducing exhaust vibration, and changing the torque section of the horsepower.

There are two small silencing packs or one big silencing pack on the middle of the general car. The car is not quiet enough, the exhaust vibration is not small enough, and the maximum horsepower torque range depends on the middle section.

For some performance cars, the middle section may be a small silencer package or no sound-absorbing package. The purpose is to let the exhaust gas emitted by the engine reduce the obstruction of smoother discharge. The sound and vibration are certainly greater than those of the family car.

Like the middle run above the super run, let alone say that most of the super runs are mid- or rear-mounted engines. The engine is closer to the tail section of the exhaust, so their middle section can be said to be almost nothing. This is also the super running sound. One of the reasons for the explosion. In fact, you can try to cut the car's exhaust half, but also fried!

Refit little knowledge: As the mid-stream exhaust can affect the maximum horsepower torque range, some mid-level conversion players will modify the mid-tail section of the car, such as straight row (without any silence package), reduce the number of silence packages or mute the package Become smaller to achieve results.

Please note: You can't modify blindly for sound. If your engine doesn't have enough exhaust gas and there is no silencer package blocking the exhaust gas, your car will lose a low twist and start to struggle.

Exhaust head section

The first paragraph of exhaust includes the exhaust manifold (basana), three-way catalytic converters, and piping. This section is also the most complicated one and will directly affect the power and exhaust emission standards.

From bananas, we refer to bananas as the only exhaust system that connects the exhaust system to the engine. Its role is to combine the exhaust gases from each cylinder and discharge them. Taking a four-cylinder car as an example, the four-cylinder exhaust gas is discharged in a 4-1 manner, which is the role of plantain.

Some small partners would ask, "I heard that there is a 4-2-1 plantain. Is this something?"

Little Knowledge Answer: Actually, Mazda's Tianchi Sky Blue technology is a 4-2-1 design. It allows the exhaust of the four cylinders to merge first and then discharge together. This is not the same as 4-1 bananas, four-way exhaust gas to a hole, squeezed badly. This design not only improves exhaust gas flow, but also reduces knocking from high compression ratio engines.

Small Classroom: The caliber of bananas in performance cars and supercars is larger than the diameter of engine exhaust ports. This design is designed to prevent the backflow of exhaust gases from blowing back into the engine to cause blockages, thereby improving the exhaust gas flow.

The wrap is for the banana to maintain high temperatures

Next to the three-way catalytic converter, the role of three-way catalytic converter is to reduce the noise while purifying the exhaust gas, different cars are also different catalytic ternary, length and thickness are not the same, the filter also has exhaust car exhaust What is the difference between two tubes and one tube? Which is more advanced? There is secret. The three-way catalysts like some performance vehicles and super-runners are relatively short and relatively sparse, in order to enhance the exhaust gas flow.

Refitting Tips: Some experienced refit players will upgrade their power through the conversion of bananas and high-traffic ternaries. The car is not ternary, and they don't have to inspect cars anyway.

Well, it's easy for small partners to know that exhaust is more than just a few holes this time. There are so many "hidden rules". But after the little friends finished watching, they couldn't look like the strange patient. They watched exhaust play under the car every day. Haha.