How Silent Running Products Work
The easiest way to learn more about Silent
Running products is to understand what makes sound. Sound
is just a disturbance in the air. When the air vibrates your
ears interpret it as sound. So basically, it takes something
moving or vibrating to make a sound.
Take the stereo in your vehicle as an
example. There are two things involved in your stereo, the
radio or power source and the speaker. The power from the
radio moves the speaker back and forth. If you want more volume
you must add more power or turn up the volume knob. What do
you think would happen if you added some weight to the speaker?
It would not be as loud. That's because it takes more power
to move the additional weight. How about if you could take
weight away? The speaker would become even louder at the same
place on the volume knob.
So you can make things louder or quieter
by adding weight to the part that makes the sound, in this
case the speaker. You could also do it by adding or subtracting
power, in the case of your radio, watts. That's all the volume
knob is doing, varying the amount of power the speaker gets.
The last thing to remember about sound
is that it is logarithmic. There are some math principals
behind it, but what it basically means is that if you add
twice as much power, you do not get twice as much sound. When
it comes to sound, adding twice as much power generally adds
enough extra volume that you can just hear the difference.
If you want to get twice as much volume, you must add 10 times
the power! Just the opposite it true when you want to get
rid of sound.
Driving along in you vehicle you basically
encounter two types of noise, airborne and structure borne.
Airborne noise is coming from someplace
outside your vehicle. Tire noise is the best example of airborne
noise; a loud exhaust is another. This noise is generated
outside of the vehicle and comes in through the windows. The
easiest way to get rid of this noise is to roll up the windows.
If that still doesn't work, then you may need to do other
things like switch tire brands, get a quieter muffler, etc.
Silent Running is made to stop structure
borne noises. These come from vehicle vibrations in the body
panels, the engine, the suspension, the A/C system and more.
With all these unwanted vibrations in check, the vehicle is
much quieter on the freeway.
The old way of removing unwanted noise
was to add heavy asphalt mats to the body metal. Believe it
or not, this is still done today. What these heavy mats do
is add mass to the body panel, often as much as the panel
itself. This doesn't remove the vibration; it just lowers
Here's why: like in the speaker example
above, the speaker keeps playing; it’s just not as loud.
That's because with the same power vibrating the panel, it
can’t move the extra weight as easily. The problem vibration
is still there. Remember sound is logarithmic. So if you added
twice the weight to the panel, it wouldn't remove half the
sound, only enough that you could just hear it. You would
have to add lots of asphalt mats to get rid of half the noise.
Silent Running WORKS IN A DIFFERENT
Instead of being a Band-Aid and trying to cover up the sound,
Silent Running works like a cure for the vibration problem.
It actually gets rid of the vibration by converting it into
What happens is the back and forth vibrations,
or mechanical energy, are converted to thermal energy or heat.
It would take a thermometer that could read down to .001 degrees
to see it, but this ""Viscoelastic" conversion
is what happens when you use Silent Running coatings.
Have you ever pushed on a rubber-like
substance that didn't come back to its original shape as fast
as you pushed it in? That's just what Silent Running is doing.
It doesn't offer much resistance in one direction, but there's
a lot in the other direction. The metal can move easily in
one direction, but not the other, something like a speaker
that could only move out and not back.
Silent Running does exactly what
it says it does... stops unwanted noise and vibration.