Why does your car exhaust make metallic sounds? It's bad?

The exhaust pipe of your car, like that of all internal combustion engines, is responsible for expelling all the combustion gases from the muffler to the outside of the vehicle. This element is part of the exhaust system of all internal combustion engines and is usually located at the bottom and rear of vehicles, although it can also be found on the lower sides or vertically. But have you ever noticed any kind of metallic sound coming from it? We explain what can happen.

The exhaust pipe of your car is more than important

Why does your car exhaust make metallic sounds

As you know, the main function of the exhaust pipe is to prevent the accumulation of combustion gases in the engine, which would reduce its efficiency. Although this element also has safety functions , since it does not allow the passage of these toxic gases into the interior of the car.

This also reduces the sound of the engine and lastly, and thanks to the introduction of catalytic converters , it helps to neutralize some of the toxic gases it releases, such as carbon monoxide or nitrogen oxides, and converts them into carbon dioxide and water vapor.

In this sense, in addition, we see that in car engines the use of the exhaust pipe is mandatory, all due to the need to reduce the noise that is caused if the exhaust were free. For this reason, on occasions, you may have felt or noticed some sound or metallic noise , something that is totally related to it.

The reasons for these noises

As such, we are not referring to brake sounds, cooling systems, or ventilation. We are referring to small metallic taps that seem to come from the engine compartment, or even from the bottom of the car.

The metallic sound is produced when you really get the juice out of your car , or what is the same; when it is hotter and the mechanics and other components have worked harder and longer. That metallic noise that is heard above all in gasoline cars and, above all, high-performance ones, is produced by the result of thermal expansion and static friction .

However, one should not jump to conclusions. In the exhaust we can find elements such as the catalyst , the particulate filter and the silencers , so the breakdown will have different costs depending on where the break is. In addition, it also has various joints, rubbers and fasteners that may have deteriorated, leaving some loose tube that collides and causes noise. Therefore, if you want to know where the annoying sound is coming from, the best thing you can do is crouch down and take a look underneath.

Escape coche sonido metálico

It’s not serious, calm down

Although this slippage usually occurs by microns, each sound emitted with a ‘ tick’ is generated when the two parts ‘peel’ away from each other, change position relative to each other, and then ‘stick’ together again, so to speak.

As you can see, those metallic sounds when we turn off the engine are due to thermal differences and the cooling of some parts that have expanded and contracted due to their cooling. These sounds can be more or less harsh and loud depending on factors such as humidity or outside temperature .