A look at the muffler: exhaust muffler
It is very easy to identify a vehicle without a muffler without having to look under the body. It is definitely noisy. You see, the idea of putting a muffler on the exhaust is to minimize noise or sound waves created by the vehicle’s engine.
The sound or noise created by the engine is usually in the form of pressure waves of alternating high and low air pressures. The engine creates a high pressure wave each time the exhaust valves are opened. The molecules present in this high pressure wave collide with the molecules in the low pressure exhaust pipe. As the gas is pushed towards the end of the tube, the sound waves travel much faster towards the exhaust tube. That is why you will be able to hear the noise first before you can begin to notice the gas coming out of the exhaust.
Now your muffler is a simple but neat device that sits right up to the tailpipe. Your job is to cancel out these pressure waves emanating from the engine so that you can no longer hear them. It does so in a process known as destructive interference. Remember what we said about noise like pressure waves? So the first pressure wave to hit the muffler is often the one with the highest pressure. However, the pressure wave that follows is at the lower pressure. When these waves reach the ear, they are not recorded as noise simply because they cancel each other out.
Inside the muffler are specially designed tubes to produce pressure waves that reflect and interfere with each other; therefore, nullifying each other. When sound waves and exhaust gases enter the center pipe of the muffler, they bounce back and are exposed to the air present in the resonator. This volume of air is what cancels out the sound waves coming from the engine. These are then reflected through the perforations found in the main body of the muffler before exiting into another perforated pipe. From here, they come out of the muffler.
It should be noted that the muffler will only partially cancel the noise emanating from the engine; it does not remove it completely. That’s why they call it a ‘muffler’ because it dampens or softens the noise that we eventually hear.
Why is the muffler ringing? car muffler
Since the muffler is an integral component of the exhaust system and its location means that it must be connected to the exhaust pipe as well as the underside of your car, the rattling sound you may hear can come from two possible sources. Either you have a loose muffler or it is misaligned in the exhaust system. Either way, this will always result in a muffler noise.
The rattling noise coming from the back of your car and right in the area where the muffler is located is often interpreted as a sign of a loose muffler. Your muffler may come loose due to a bad connector, a loose or damaged mount, or even a degraded rubber suspension. These components secure the muffler to the chassis of your car.
As you may already know, the muffler is not really plastic or rubber to begin with. It is made of metal. If the components that are supposed to hold it in place are not working properly, then the muffler will move up, down, and sideways as the vehicle moves forward as well. Sometimes it can even rattle noise right after starting the engine and running it at idle. The rattling noise is usually heard when driving, especially during acceleration or when driving on poorly paved roads. As the vehicle moves, the loose muffler slams against the other parts of the car body producing the characteristic rattling sound.
Components that secure the muffler can corrode over time. With corrosion comes weakness and this can lead to loosening of the various connections. When it comes to corrosion, there are many factors that can accelerate the rate of corrosion. Things like road salt, excessive heat, debris, and even the …