Today, let’s check out one of the most annoying things you may suffer owning a car, the rattling noise coming from underneath of your vehicle.
There are various elements contributing to rattling noise and one of the most common is one of the components of the exhaust system has been loosened. It could be inappropriately fitting pipe gaskets, broken hangers, a loose muffler or a less firmly secured heat shield.
Moreover, outworn CV joints, failed bearings and loose U-joints can also result in these irritating sounds. The loose calipers are sometimes the culprits. If the sound comes after you hit bumps on the road, it tells you that the problem may lie in the ball joint or suspension system. Strange noises usually signify other more serious problems, so be careful and make sure to have your car serviced when you encounter them.
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How the mufflers work
The main job of a muffler is to reflect and block sound waves, thus dampening the noise from the exhaust. Now take a look at what is inside it, the muffler includes a system of perforated barriers and baffled chambers which dissolve the high-velocity sound waves when they get their way through it. Therefore, the noise level is significantly reduced.
The fact is the more gas blocked inside the muffler, the less powerful the engine is
As an engine fumes, it does lots of rapid and staccato bursts. These rapid blasts make sound waves as they compress the air into distinct waves, With the exhaust valve open, gas molecules will be pushed forward, then compressed into a wave while with it closed, they scatter and become slack. When the waves are getting through the muffler chambers, some collide into the surfaces and bounce back to the source. Consequently, the waves hit each other in the opposite direction cancel out each other.
Outworn CV joints, failed bearings and loose U-joints can result in these irritating sounds
The fact is the more gas blocked inside the muffler, the less powerful the engine is. Therefore, a certain amount of gas should be released through the tailpipe for the sake of the engine power. In other words, the muffler can be loud under the circumstances. There are a diversity of muffler styles you can choose from, consider which level of noise compression is good for you (and your car).