Now, is there a car modification product that can enjoy a little bit of passion when driving alone, and let the car have a quiet environment when traveling with family? Yes, the answer is the car's variable valve exhaust system, an exhaust system that can be used both for everyday use and for driving pleasure. It happened that recently, the modified brand aSpec released their latest variable valve exhaust system, and I will introduce it to you through this opportunity.
Before introducing the variable valve exhaust system, let us first talk about the advantages and disadvantages of the traditional non-variable valve modification exhaust system, so that everyone can understand the principle of the variable valve exhaust system more easily in the following content. , structure and characteristics.
First, the structural principle and advantages and disadvantages of the traditional non-variable valve exhaust
To say that the variable valve exhaust must first be from the structure of the original exhaust, the exhaust system refers to the system that collects and discharges the engine exhaust, including the exhaust manifold, the exhaust pipe, the muffler, the tail pipe, and There are two forms: one is to press back the exhaust, and the other is to go straight out of the exhaust.
â— Back pressure exhaust:
When the engine is working, the exhaust gas from each cylinder will be discharged from the cylinder in a certain order, and collected into an exhaust line through the exhaust manifold, which will generate a wave of gas in it. Waves, lined up and walked out of the pipeline.
At the same time, each pulsed air wave will generate a certain vacuum pressure to the rear air wave when it is discharged through the exhaust pipe, so that the first exhaust gas will use this vacuum pressure. The exhaust gas to be discharged from the latter cylinder is sucked out, and when the engine is operated at a low speed, the exhaust efficiency of each cylinder is pulled, thereby making the engine work more smoothly.
The exhaust form also has some disadvantages in that the exhaust pipe is deliberately designed to ensure a back pressure, so that the exhaust efficiency is hindered when the engine enters a high speed region. Exhaust gas from the front of the engine cannot be quickly removed from the exhaust line, which will hinder the exhaust gas behind.
Therefore, the advantage of back pressure exhaust is to take care of the torque output of the engine at low speed, while the slightly complicated exhaust line, especially the silencer, makes the engine exhaust sound quieter.
Advantages and disadvantages
Advantages: Provide a certain exhaust back pressure to ensure the torque output of the engine at low speed, and the exhaust sound is quieter.
Disadvantages: The exhaust efficiency of the engine at high speed is not high, so that its high speed power cannot be completely released.
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