Silencers 101

Over the past couple of years we have noticed an increasing demand for “quiet” silencers and are pleased to announce the following product is now available.

Always remember these are still aftermarket products and the tone of a vehicle once fitted, may differ to the original sound.

Powerflow are moving away from 430 grade stainless steel due to 90% of orders being for 409 grade stainless steel. Products made from 409 grade stainless steel will be made to order.

Automatic cars, in general, become louder when the original system is removed. Powerflow cannot guarantee that a silencer will make the vehicle quieter.

The main function of Silencer is to reduce noise & to transmit exhaust gasses to the atmosphere BUT it also serves some more function
1. Decrease fuel consumption
2. Exhaust gasses in the Silencer can be used to produce some power that can charge the Battery of your vehicle

Silencers are installed within the exhaust system of most internal combustion engines, although the silencer is not designed to serve any primary exhaust function. The silencer is engineered as an acoustic soundproofing device designed to reduce the loudness of the sound pressure created by the engine by way of Acoustic quieting. The majority of the sound pressure produced by the engine is emanated out of the vehicle using the same piping used by the silent exhaust gases absorbed by a series of passages and chambers lined with roving fiberglass insulation and/or resonating chambers harmonically tuned to cause destructive interference wherein opposite sound waves cancel each other out. An unavoidable side effect of silencer use is an increase of back pressure which decreases engine efficiency. This is because the engine exhaust must share the same complex exit pathway built inside the muffler as the sound pressure that the muffler is designed to mitigate.

Some vehicle owners remove or install an aftermarket silencer when Engine tuning in order to increase power output or reduce fuel consumption because of economic or environmental concerns, recreational pursuits such as motorsport and hypermiling and/or for personal aesthetic acoustical preferences. Although the legality of altering a motor vehicles OEM exhaust system varies by jurisdiction, in most developed parts of the world, modification of a vehicle’s exhaust system is usually highly regulated if not strictly prohibited.

If you’ve ever heard a car engine running without a silencer, you know what a huge difference a silencer can make to the noise level. Inside a silencer, you’ll find a deceptively simple set of tubes with some holes in them. These tubes and chambers are actuall­y as finely tuned as a musical instrument. They are designed to reflect the sound waves produced by the engine in such a way that they partially cancel themselves out.

Silencers use some pretty neat technology to cancel out the noise. In this article, we’ll take a look inside a real car silencer and learn about the principles that make it work.

But first, we need to know a little about sound.

Where Does the Sound Come From?

Sound is a pressure wave formed from pulses of alternating high and low air pressure. These pulses makes their way through the air at — you guessed it — the speed of sound.

In an engine, pulses are created when an exhaust valve opens and a burst of high-pressure gas suddenly enters the exhaust system. The molecules in this gas collide with the lower-pressure molecules in the pipe, causing them to stack up on each other. They in turn stack up on the molecules a little further down the pipe, leaving an area of low pressure behind. In this way, the sound wave makes its way down the pipe much faster than the actual gases do.

When these pressure pulses reach your ear, the eardrum vibrates back and forth. Your brain interprets this motion as sound. Two main characteristics of the wave determine how we perceive the sound:

• Sound wave frequency – A higher wave frequency simply means that the air pressure fluctuates faster. The faster an engine runs, the higher the pitch we hear. Slower fluctuations sound like a lower pitch.
• Air pressure level – The wave’s amplitude determines how loud the sound is. Sound waves with greater amplitudes move our eardrums more, and we register this sensation as a higher volume.

It turns out that it is possible to add two or more sound waves together and get less sound. Let’s see how.

How Can You Cancel Out Sound?

The key thing about sound waves is that the result at your ear is the sum of all the sound waves hitting your ear at that time. If you are listening to a band, even though you may hear several distinct sources of sound, the pressure waves hitting your ear drum all add together, so your ear drum only feels one pressure at any given moment.

Now comes the cool part: It is possible to produce a sound wave that is exactly the opposite of another wave. This is the basis for those noise-cancelling headphones you may have seen. Take a look at the figure below. The wave on top and the second wave are both pure tones. If the two waves are in phase, they add up to a wave with the same frequency but twice the amplitude. This is called constructive interference. But, if they are exactly out of phase, they add up to zero. This is called destructive interference. At the time when the first wave is at its maximum pressure, the second wave is at its minimum. If both of these waves hit your ear drum at the same time, you would not hear anything because the two waves always add up to zero.

How sound waves add and subtract

In the next section, we’ll see how the silencer is designed to create waves that cause as much destructive interference as possible.

Inside a Silencer

Located inside the silencer is a set of tubes. These tubes are designed to create reflected waves that interfere with each other or cancel each other out. Take a look at the inside of this silencer:

The exhaust gases and the sound waves enter through the centre tube. They bounce off the back wall of the silencer and are reflected through a hole into the main body of the silencer. They pass through a set of holes into another chamber, where they turn and go out the last pipe and leave the silencer.

A chamber called a resonator is connected to the first chamber by a hole. The resonator contains a specific volume of air and has a specific length that is calculated to produce a wave that cancels out a certain frequency of sound. How does this happen? Let’s take a closer look …

The Resonator

When a wave hits the hole, part of it continues into the chamber and part of it is reflected. The wave travels through the chamber, hits the back wall of the silencer and bounces back out of the hole. The length of this chamber is calculated so that this wave leaves the resonator chamber just after the next wave reflects off the outside of the chamber. Ideally, the high-pressure part of the wave that came from the chamber will line up with the low-pressure part of the wave that was reflected off the outside of the chamber wall, and the two waves will cancel each other out.

The animation below shows how the resonator works in a simplified silencer.

Waves cancelling inside a simplified silencer

In reality, the sound coming from the engine is a mixture of many different frequencies of sound, and since many of those frequencies depend on the engine speed, the sound is almost never at exactly the right frequency for this to happen. The resonator is designed to work best in the frequency range where the engine makes the most noise; but even if the frequency is not exactly what the resonator was tuned for, it will still produce some destructive interference.

Some cars, especially luxury cars where quiet operation is a key feature, have another component in the exhaust that looks like a silencer, but is called a resonator. This device works just like the resonator chamber in the silencer — the dimensions are calculated so that the waves reflected by the resonator help cancel out certain frequencies of sound in the exhaust.

There are other features inside this silencer that help it reduce the sound level in different ways. The body of the silencer is constructed in three layers: Two thin layers of metal with a thicker, slightly insulated layer between them. This allows the body of the silencer to absorb some of the pressure pulses. Also, the inlet and outlet pipes going into the main chamber are perforated with holes. This allows thousands of tiny pressure pulses to bounce around in the main chamber, cancelling each other out to some extent in addition to being absorbed by the silencer’s housing.

Backpressure and Other Types of Silencers

One important characteristic of mufflers is how much backpressure they produce. Because of all of the turns and holes the exhaust has to go through, mufflers like those in the previous section produce a fairly high backpressure. This subtracts a little from the power of the engine.

There are other types of silencers that can reduce backpressure. One type, sometimes called a glass pack or a cherry bomb, uses only absorption to reduce the sound. On a silencer like this, the exhaust goes straight through a pipe that is perforated with holes. Surrounding this pipe is a layer of glass insulation that absorbs some of the pressure pulses. A steel housing surrounds the insulation.

Active Noise-Cancelling Silencers

There have been a few experiments with active noise-cancelling silencers, especially on industrial generators. These systems incorporate a set of microphones and a speaker.

The speaker is positioned in a pipe, which wraps around the exhaust pipe so that the sound from the exhaust comes out in the same direction as the sound from the speaker. A computer monitors a microphone positioned before the speaker and one positioned after the speaker. By knowing some things about the length and shape of the pipes, the computer can generate a signal to drive the speaker. This can cancel out much of the sound coming from the generator. The downstream microphone lets the computer know how well it is doing so it can