By turning the ignition key in the car, or by pressing, you, as a doctor, must be able to listen to the car in order to detect extraneous noise in time, which may indicate possible.
Unfortunately, many drivers forget that any car is a complex technical device, which can break from time to time. Remember that anyone should not have extraneous noises and incomprehensible sounds.
If for some reason your car began to make some extraneous noise, then it is quite possible that the car is faulty. Here are ten of the most common reasons you can hear in a car.
1. Hiss
Of course, the hiss may be due to snakes under the hood of your car. But this is from the realm of fantasy. Everything is much easier.
If you hear a hiss under the hood when the engine is running, then the most likely cause is a leak in the cooling system or a depressurization has occurred. vacuum systems cars.
If an antifreeze leak occurs, this can lead to overheating of the engine. Therefore, if you hear a hiss under the hood, contact your technical Center for vehicle diagnostics and troubleshooting.
2. Clatter
If your car makes a clicking sound while driving over bumps or potholes, then this is likely normal.
But if a similar sound occurs on flat road or not on large bumps, then it is worthwhile to conduct a thorough diagnosis of the chassis of the car, for the suspension and other parts of the car.
It is possible that the cause of extraneous noise on the road is a malfunction, ball joints, stabilizers or steering tips. Also, similar noises can sometimes be produced by a faulty exhaust system.
3. Squealing under the hood
If your car's engine is making a squealing sound, then it could be an old or worn tensioner pulley. Usually, when the belt tensioner pulley wears out, the belt tension weakens, as a result, the belt begins to slip, which will eventually lead to its breakage.
Fortunately, repair of this part is simple and inexpensive. But don't let the belt break. It is necessary to change everything and the alternator belt in time.
If you do not change these components of the car in time, then, being on an empty highway at 2 o'clock in the morning in winter time V broken car you will understand how important it is to carry out regular maintenance vehicle and timely replace failed parts.
4. Metallic squeal
If during braking you heard a metallic squeal, then most likely you are almost worn out.
Many modern brake pads are designed in such a way that when the friction coating is worn down to a certain layer, the pads begin to squeak strongly at , reminding you that it is time to replace them.
If you, despite the squealing or creaking of the pads, decided for some reason to postpone their replacement, then the sound will increase with every kilometer.
If such a sound appears not only during braking, then there is also a possibility that one of the wheel bearings in the car is faulty.
5. Crack or crunch
If your car is front-wheel drive and you hear a crunch or crackle at low speed (especially if you turn the steering wheel all the way in a corner), then the CV joint is likely to be malfunctioning.
These are the complex parts of the car that transmit torque from the box to the wheels. If the CV joint is not changed in time, then the drive may break the mounting sockets in the gearbox. Therefore, if you hear a crunch or urgently contact a car repair shop for diagnostics and troubleshooting.
Also periodically inspect the anthers of the CV joints for cracks and damage. The CV joint boot protects the drive from dust and sand, which can damage the CV joint.
6. Growling or vibration when turning the steering wheel
If the car starts to growl during turns, this may be a sign that the power steering pump. Remember that you cannot ignore the signs of power steering failure. This is a matter of your safety behind the wheel.
True, many modern cars and trucks equipped electric amplifier steering. Therefore, if in your car, then a growl in the event of a malfunction cannot appear.
However, on the road today, many cars are equipped with hydrolytic power steering. Therefore, every driver of such machines must carefully treat hydraulic system, timely changing the hydraulic booster fluid and diagnosing the system for hidden defects.
7. Beats under the hood, whistling
If you hear a knock under the hood, then be careful, as the cause of the knock may be. These sounds can be associated with three causes of a malfunction in the combustion of fuel in the engine's combustion chamber. The first reason may be related to ignition problems (malfunction of the ignition coil, high voltage wires). Another cause could be a clogged injector.
Be aware that poor ignition can cause popping or knocking, which can lead to unnecessary detonation when the engine burns fuel. Detonation can damage the motor.
Due to incorrect ignition, several flame sources are formed in the combustion chamber, which, when meeting with each other, create an overpressure in the combustion chamber. Detonation is big. It can damage the motor pistons.
If your car has a problem with ignition due to low quality fuel or for other reasons, then pouring high octane gasoline can fix the problem.
8. Engine rattling or knocking
If your engine is making a thumping sound that gets louder as you rev it up, it could mean serious malfunctions power unit car.
If you hear the sound "knock-knock-knock" or the like. then the oil pump may not be supplying oil with necessary pressure or engine valves require clearance adjustments. A knock in the engine, of course, may not mean a serious problem, but any extraneous sound in the motor requires. The sooner you do this, the better.
If the knock is somewhere deep inside the engine, then it is quite possible that you will have an expensive engine repair. For example, a similar knock in the engine may indicate a malfunction of the connecting rod bearings, which will cost you a considerable amount to replace.
Do not delay with diagnostics and repairs, because worn connecting rod bearings can damage the engine, leading to more expensive repairs.
9. Crunch in the gearbox
If your car has mechanical box gears, and while driving when shifting gears you hear a crunch, this can be a symptom of various problems. Typically, this is associated with long runs car and natural wear and tear.
For starters, a crunch in the gearbox when shifting gears can indicate wear on synchronizers and other transmission components. Synchronizers perform important role in gearboxes, aligning the rotational speed of the shafts and gears in order to transmit the required at a certain speed.
Also, the crunch may indicate clutch wear. Usually with this malfunction, a crunch appears when the clutch pedal is fully depressed during gear changes. The same thing happens with a good clutch if you do not fully depress the clutch pedal.
10. Howl
If your car is equipped and while driving from the rear you hear a characteristic howl, then it is quite possible that the car has a problem with the differential. A worn differential can produce a variety of noises at various driving situations(both acceleration and deceleration). These noises can also cause worn bearings.
but few people know about the propagation of sound waves,
their frequency, amplitude, attenuation, before noise isolating!”
"Effective sound insulation VAZ 2101, 2102, 2103, 2104, 2105, 2106, 2107
and other cars according to the principle of sound absorption "
Have you ever wondered why even the old humming diesel foreign cars have a quieter interior than the classic Zhiguli VAZ 2101-07 and Niva? Outside, the engine roars, but the cabin is silent. Miracles?
Everything is very simple - it's thanks to the work effective sound insulation, or rather, it will be said the soundproofing of the cabin.But until recently, simple but very effective soundproofing was not available, and we decided to put an end to it!
Story. The beginning of the idea of soundproofing VAZ
It all started about 5 years ago.
Riding on the old diesel Ford Sierra 84 year of release, which has not an engine under the hood, but some kind of jackhammer, I noticed that there is complete silence in the cabin!Accelerating the car in third gear, to hear the engine, you need to listen hard. It only presses you into the seat, but there is no noise. At one point, the idea was born to make a "Deaf Salon" in the classic Zhiguli. Moreover, we have a huge advantage on our side. Gas engine VAZ works much quieter. And the question immediately arose.
What material to use for car soundproofing?
Working at a service station and passing several cars a month, it was good to experiment with something ... But stillwith teat which one to choose
soundproofing material had problems. An Internet search led to gluing with splenitis, isolon and other useless nonsense, as it turned out later. What is most interesting is that the customers were satisfied! They are more content with beauty and what is done than efficiency. We tried everything that can be found on the Internet, but this is not it! Not everyone can afford the cost of beautiful soundproofing, but the interior is still notdeaf, you can hear the engine! In addition, this soundproofing cannot be glued after repair and bodywork ... Maybe our hands are crooked? We decided to compare the results of others. Comparing the noise level of the interior of the BMW and VAZ 2110, glued by specialists at the company's MOT, the VAZ is squeezed out, although the engine on the top ten was quieterBoomer. Comparing this top ten with the Audi 80, I liked it more in Audi. Feels quieter in the Audi. Audi and bmw old and not glued. There were no such adhesives then, and the machines were quiet. In general, what materials did we not use, butZhigovsky engine VAZ 2101 broke into the cabin. 
And here accidentally catches the eye on disassembly diesel car, which completely changed the viewOsoundproofing. You can't even imagineyou can, how delighted we were when we saw on a disassembled car how it works and why. At first, we tried to apply all this on our own on the classics, and even something similar began to work out, but there were disadvantages and difficulties. We did soundproofing for clients, they were simply shocked by the silence in the cabin! But there were problems with the material - there was nowhere to buy it. We decided to find him a worthy and as cheap replacement as possible.
Now is the time for theory, reading and learning. A book on physics, a library, and that's it! Previously, a similar result was achieved by enthusiasts. On an old, noisy car, the interior was made very deaf. Again, understanding the laws of physics, nothing more. 
Splen, isolon and similar materials heat insulators. They generally do not turn off the sound, a-priory. This has already been proven hundreds of times by various tests. Splen, isolon, etc. have a solid closed cell structure and best case very weak reflection of sound. In short, 80 to 90% of the sound passes through such materials.
But there is still a benefit to it. The glued material can act as a heat and vibration isolator. paste over interior in a continuous no need. Izolon, splen, etc., especially rubber-based materials that are for
convenience with an adhesive base, ideally extinguish resonance. That is, the metal parts of the body will not create a background. There is no need to glue the whole part.Mid-high-frequency noise, namely sound, this material lets through, even pasting over the entire part!The image on the left shows the principle of where, where and how to glue vibration isolation.Large flat panels, where there is no rigidity, corners, edges, will resonate and radiate the background accordingly. They will need to be calmed down so that they do not resonate. Click on the picture to enlarge.
Noises emanating from the resonance of body metal body parts were sorted out. But with sound propagating through the air, everything is different. To block the passage of sound, it must be absorbed. According to the theory of wave reflection, the amplitude attenuation occurs with each wave reflection. If the soundproofing material has millions of fibers, then the sound passing through the fibrous material will cause vibrations of the fibers of the material with its vibrations.As a result, the material converts vibrational energy into heat. In short, using the right soundproofing material, the engine is not audible in the cabin.
car soundproofing material
Having visually studied a bunch of cars with a loud engine and a quiet interior, a common parallel was revealed - the application physical property sound absorption. By cars imported production you can see in the cabin a thick rubberized foam rubber (if I may say so) with a durable outer part. Do more early models something like thick felt with cotton wool, and the outer part, as it were, from a pressed thread. 
Opel Omega. In the cabin, a thick sound-absorbing material is laid on the entire engine wall. It covers the engine wall in the cabin in one piece. IN engine compartment on the motor wall + the tunnel is covered by a thick soft material in the shell. If it's hard to see, click on the image.
Engine wall. The most basic source of mid-high frequency noise penetrates through it. The sound of the engine passes into the cabin through the engine wall. Properly positioned in this place sound-absorbing material , will provide reliable protection from the murmur classic motor in the cabin. You already figured out what to do, right?
Tunnel. Noise from the gearbox, flexible coupling, universal joint and part of the exhaust pipe ringing penetrate through the tunnel. Near the handbrake in the tunnel there is an open space. A whole chapel erupts from here various sounds. Carry out soundproofing of the tunnel at the same level as the motor wall.Click on the pictures on the left to read the description.
Arches + back wall. I noticed that after I cut holes in the rear shelf for speakers, an exhaust sound and some other background appeared in the cabin. The factory soundproofing of the rear shelf looks like oilcloth + burlap, but surprisingly, it has a significant effect on noise suppression. Isolate the rear wall as tightly as possible (marked in red in the image) behind the seat back and arch rear wheels. The trunk is the volume in which there are many different noises. It is also desirable to soundproof the trunk with vibration isolation and soundproofing. The wings and the floor resonate terribly! rear shelf where speakers are usually placed is the source extraneous noise. Be sure to soundproof!
What does soundproofing according to the sound absorption method give?
1
.
deaf salon. Do-it-yourself noise isolation to such a level is impossible? Maybe!
2.
Removes noise from the transmission in the cabin. Gearbox, flexible coupling, cardan, axle make noise. Noise can be removed!
3.
Eliminates noise exhaust system
. With the help of the sound absorption method, exhaust noise is not heard in the cabin!
4.
Keeps cabin warm in winter. Heat does not leave the car interior as quickly. The salon warms up faster.
5.
Makes a cool lounge in the heat. The roof of the car will not transmit heat to the passenger compartment. It will be like a shadow.
6.
Removes annoying engine noise. Can't hear the engine in the cabin in first gear at medium speeds.
7.
Allows you to enjoy the ride in silence. Passengers freely communicate with each other and by phone.
Are there any disadvantages to this soundproofing method?
It would be wrong to only praise, because you can find flaws in everything.
Drawback #1 You will have to do the soundproofing with your own hands. You can, at your own peril and risk, give grief to the masters. In the second case, it may be a hack.
Drawback #2 Afraid of water. However, like all other effective soundproofing materials used in automotive industry. Don't throw your car into the river. IN normal operation And correct application, the sound absorbing material will be dry.
Drawback #3 The car is getting heavier. Depending on the requirements and fanaticism, from 7 to 55 kg is added. There was no effect on speed!
How and where can one learn the principle of effective soundproofing? 
1. BOOKS.
Guided by specialized literature. If you like to read, have time to study physical phenomena, the work of scientists in various printed manuals and books, then a physics textbook is a good place to start.
Pros: Very cheap (virtually free)
Minuses: long, boring, tedious, superficial and will have to experiment.
2. ON SITES ON THE INTERNET.
You will be confused by conflicting information. There are many good articles, but there are many contradictions and intricacies. At first, you will still have to return to physics, and then, with understanding, take up the study. Then experiment.
Pros: For free.
Minuses: Big waste of time, experimenting, experiments cost money, investments may not pay off 100%
3. LOOK IN CAR SERVICES
I do not think that they will agree to show you, let alone teach. In addition, everything there is often built on making a show-off and getting money for it. And if everything is serious, then no one will be with you show their secrets and practical experience.
Pros: good example on practice.
Minuses: you will have to negotiate, you may have to pay, doubts that all secrets will be revealed.
4. FIND SOMEONE WHO WOULD SHOW
If you manage to find a soundproofing specialist who agrees to be your mentor, then this will be an ideal option for you.will get you the fastest results. There are people who are very well versed in soundproofing and are ready to help for some fee.
Pros: Quickly and efficiently
Minuses: Expensive, hard to find
5. "EFFECTIVE SOUND PROOFING INTERIOR"
Precisely because there are many myths, bullshit and contradictions, We started shooting a full-fledged training course - "Effective Interior Soundproofing" in video format.
This course is a kind of mentor.. A man with his own hands demonstrates the process of soundproofing, explaining all the details in detail. To some extent, this is even better than a live teacher, because you can return to the desired episode an infinite number of times to remind yourself of a certain moment.You will see that it is actually easy and quite doable without any special knowledge, because you will get it already in soon.
What is the strength of this video course?
This video course was created in practice, which shows in detail each of the actions performed in video format. Our goal is to save you time and money. First, you do not have to experiment in the hope - it will work or not! It doesn't matter what skills you have in car repair and maintenance. If you want to efficient and inexpensive to make the engine inaudible - we have developed this course just for you!
And now let's get a little acquainted with the material that awaits you in the course.
Disc navigation menu
Lesson #1Overview of sound-absorbing materials
The first lesson is devoted to an overview of the very effective sound-absorbing material used. In this lesson, you will learn what it looks like, how it is sold, and the amount of soundproofing material that can do a miracle. good review materials used in order to sensibly familiarize yourself with the materials for sound insulation.
Duration: 3:51
Lesson #2 Overview of required tools
The second lesson will show you a set of recommended tools. The use of elementary tools will greatly facilitate your work. In this lesson, you will learn about necessary tools so that it is as easy as possible to perform sound insulation without wasting extra time and effort. After all, everything should be easy, beautiful and efficient!
Duration: 1:39
Lesson #3 Removing the dashboard
As a rule, soundproofing work begins with dismantling the cabin. This lesson will show not only the removal dashboard. You will learn how to prepare the interior to begin isolating the sound of penetrating, nasty engine sound into the car interior. How to prepare a mount to secure the car soundproofing material.
Duration: 16:30
Lesson number 4. Material cutting
Wouldn't you like to remove all the nodes in order to free the body completely? This lesson is about how to make a pattern. Step by step, a person shows all the dimensions, draws, cuts, until a full-fledged one is obtained ... Thus, you can easily repeat after the master and you do not have to disassemble everything to the bare body.
Duration: 21:00
Lesson number 5. Installing the material on the body
In this video tutorial, you will clearly see in detail how to create an effective barrier against a noisy engine in an elementary way. In great detail, with multiple tips and explanations, you will see how to lay and secure the pre-prepared material, so that later it does not interfere with anything during assembly.
Duration: 01:12:31
pattern drawing
The actual size of the manufactured soundproofing sheet. Although it is shown in the lesson how it is done and the dimensions are voiced in parallel, we still decided to draw a drawing so that you can navigate not only visually, but also in numbers.
As a result, five lessons with a total duration of 1 hour 54 minutes
The first full-fledged training video course
for soundproofing VAZ 2101-07
« EFFICIENT SOUND PROOFING OF THE INTERIOR»
The video course "Effective interior soundproofing" is our successful experience, experiments, many hours of time spent in search of an effective and inexpensive method of soundproofing.
After spending 1 hour 54 minutes studying, you will make a truly quiet salon in 1 day. The engine in the car will no longer be heard.
Take advantage of this knowledge now!
How much does it cost?
When we were faced with the question: "What price should we charge for our course?", we first of all started looking at prices for sound insulation at various car services.
Focusing on such services, we first wanted to set the price of a video course equal to the price that they charge in car services for such work. Prices have changed recently, so we will express the cost in US dollars. For this work, they would have taken about 300 USD in the cheapest service station.
And yet, after careful consideration, we decided that our experience should be available to as many car enthusiasts as possible, so we have reduced the price for you!
There are many situations in life... We want to make this transaction as safe as possible for you. As always, our guarantee is on top! “If, for any reason, you would like a refund of your paid cash for this course, you just need to write to E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it and specify an account for a refund. Rest assured, your money will be returned to you within 48 hours.
Therefore, we deprive you of risk, you risk nothing. The material is in video format and chewed inside and out, so you will succeed! We are confident in this course and therefore we give you such a guarantee!
ATTENTION! Shipping costs for the physical version of the course are not included in the price!!!
ELECTRONIC VERSION OF THE VIDEO COURSE (downloaded to your computer immediately after payment)
30 y.e.(UAH 691.24,1999.54 RUB ) price may change according to the exchange rate
100% money back in case of failure
|
Available payment methods: 1. Payment by mail upon receipt (Russia and Ukraine) 2. Cards 3. Any bank in your city, Internet banking 4. Electronic money and QIWI 7. Salons Euroset and Svyaznoy Available shipping methods: 1. Russian Post (delivery to any country) 2. Delivery in Ukraine ("Ukrposhta" or "Nova Poshta") 3. Downloading the digital version of the product 4. Delivery by Express EMS 5. Delivery by courier to the door |
Answers to frequently asked questions
How to place an order for a course?
Click the big yellow button "Checkout!" and follow the instructions.
Is the course distributed only on disks or will it be available as an archive?
It will also be possible to buy a digital version with download via the Internet.
How much does the electronic version of the course weigh?
About 3.6 GB
Your course is protected. Tell us more about activation and what are the launch restrictions?
The training course "Effective Salon Soundproofing" has protection. To run it, you will need an activation key, which for the digital version of the course is automatically sent to your email address after payment, and when ordering the physical version, it is included in the box with the disk
Internet access is required for activation. Activation needs to be done only at the first launch, during all subsequent launches the key will not be requested and access to the Internet will not be required. With one key, you can run a course on three different computers. The key is tied to the hardware of the computer and reinstalling Windows does not affect it.
Please note that video tutorials can only be run on Windows ( virtual machine, Mac OS and Linux will not work). If you have an Apple computer (iMac, Macbook, Mac mini, etc.) and you have Windows installed there via BootCamp as a second OS, then you can run the course in it and work with it without problems.
Can you please tell me whether it will be possible to resume the course in case of a disconnection of the Internet connection?
Yes, sure. The server supports resume.
If I buy a digital download online and then accidentally delete a course, can I download it again?
Yes, you can download the course again.
I am not from Russia, can I buy your course?
Yes, but only by prepayment using one of the proposed methods. Upon delivery, you can choose to send the disc by mail or choose the electronic version and download it immediately after payment. If you are a resident of Ukraine, Russia, Kazakhstan, then cash on delivery is available for you (payment upon receipt).
Is it safe to pay for a course with a credit card?
Yes, it's absolutely safe. We have agreements with proven and reliable payment systems, such as ROBOKASSA, One Wallet, Interkassa, through which your payments are received.
How long does it take to receive a parcel in the mail?
Depending on your remoteness, the parcel will go by mail from 2 to 7 days.
Where is the shipment from?
Orders in Russia are sent from the city of Armavir.
Orders across Ukraine are sent from the city of Kherson.
Orders in Belarus are sent from the city of Minsk
Orders across Kazakhstan are sent from Astana
Sincerely, the project team Improvement of cars of the VAZ family
Surely, each of us dreamed of own car. Fortunately, in recent years, global automakers have begun to launch more and more inexpensive cars on the market, which has allowed many to realize their old dream.
But behind the low cost hides its very unpleasant nuances. Among them are very low level soundproofing. Therefore, while driving such a car, you will immediately feel annoying noise from the road and oncoming wind flows, you will literally feel vibrations from the motor. Do you want to get real driving pleasure and enjoy every moment behind the wheel? Then you should think about the full or partial soundproofing of the car.
When buying a car, one of important criteria, which you need to pay attention to is an indicator of the level of sound insulation of the machine. Unfortunately, automakers rarely indicate the noise level in the specifications for the car. And it’s quite difficult to evaluate it on your own during a test drive. So how to be, let's figure it out in order.
Types of noise
First of all, let's define the types of noise. Airborne noise is caused by the air itself (headwind flows, gusts, etc.). Structural noise manifests itself through solid bodies (a running engine transmits vibrations to the body through the fasteners, as a result of which the panels emit various squeaks, crickets and taps).
Structural noise is divided into two types:
1. Primary noise comes from the engine, exhaust system, transmission, tires, etc.
2. Secondary noise comes from: metal body panels (floor, fenders, arches, doors, roof, etc.), plastic interior parts ( dashboard, various linings, etc.), and from small metal structures (window regulators, lock drive rods, etc.).
Noise propagation paths
Now we know what types of noise exist, it remains to figure out how they get into the car.
Airborne noise penetrates the cabin through body leaks: doorways, technical holes in the floor and through the windows.
Structural noise enters through the suspension and chassis elements. The vibration transmitted from these elements extends to all body panels. These vibrations are the source of noise inside the car.
How to deal with noise
In creating a comfortable, “quiet” car, the final step is its sound insulation. Of course, first of all, you must "bring to mind" your car constructively. And only then, the remaining flaws should be eliminated with the help of sound-absorbing and sound-proofing materials. It is necessary to eliminate knocking suspension elements and loose fastenings of interior elements, as well as “secant” sounds from the exhaust system.
What to use
Today, there are two main types of sound insulation:
1. based on natural or synthetic fiber-structural materials
2. based on synthetic gas-filled plastic (polyurethane foam, polypropylene foam, isolon)
The main indicator of sound-absorbing material is the thickness, i.e. the thicker, the better. And the indicator of efficiency is the sound absorption coefficient (KZP). The necessary sound absorption of materials is in the frequency range from 600 to 4000 Hz. Modern materials absorb noise up to 3000 Hz.
Now let's take a closer look at the main types of materials for soundproofing.
Accent - is the main material-noise absorber. Front side equipped with a metallized film for partial protection against moisture. Thanks to it, it has thermal insulation and sound-reflecting properties.
Isotone - has a smaller cell structure, which makes it more effective in the high frequency region.
Bitoplast - more often used as a good sealant and anti-creak material. But also, due to its open structure, it is a good noise absorber. It is better to use it as a second layer, or as an acoustic shield.
Where to eliminate noise
There are two approaches to soundproofing: partial and full.
Partial soundproofing involves the installation of soundproofing materials on individual elements bodies that are most susceptible to various vibrations, and as a result, the spread of noise. Soundproofing doors in addition to reducing noise from pavement and headwinds, improves the sound quality of your audio system. Soundproofing arches eliminates the noise coming from the wheels of the car. Noise isolation plastic panels relieves you of various squeaks, crunches and reduces the noise level from the ventilation system.
Complete sound insulation of the car is a multi-layer processing of all available body elements (doors, ceiling, floor, wheel arches, luggage compartment, engine shield) and car interior panels.
Now, knowing the main types of noise, you can easily recognize " weak spots» of your car, and you will understand what type of sound insulation is best for you: full or partial, and what material you should use to eliminate these noises.
In the near future we will tell you how you can install soundproofing yourself. But if you have never encountered similar work, and want to be sure of the result, you should still contact a specialized service.
Who doesn't want to! We are fooling ourselves from the roar generated by us. And silence today is just a quieter noise that you have long been accustomed to ... Meanwhile, the World Health Organization warns: prolonged exposure to noise exceeding 80 dBA leads to backfire- from auditory to cardiovascular, and even with an ulcer to boot!
Music and tuning enthusiasts take a radical approach to dealing with noise, sometimes taking the car apart to the ground. This is an occupation for the giants of the spirit. For the most part, motorists are not ready to lay out decent money, spend a lot of time and effort for the sake of elusive decibels. Now, if it were relatively inexpensive and without dismantling the interior, then you can still think ...
And we thought. After that, we decided to test the anti-noise compounds that are applied to the bottom and wheel arches. After all, with a measured ride, it is the noise from the road that is the main component of extra decibels. And instead of competitions of various cans and cans, we decided to compare the methods of applying the compositions. In other words, we will evaluate not so much the means themselves as the technology of their application. The preparations we have chosen are shown in the photo. These are anti-noise polymer-bitumen mastic (aerosol) "Eltrans", slate anti-corrosion anti-noise mastic "AvtoNOL", as well as noise-absorbing material "PRIM Antishum", all three - domestic production. Spray cans and jars for manual application were purchased in the capital's stores, where, by the way, there was not much choice - I had to look! As for the professional preparation for the primer gun, we chose the most massive product used in many car dealerships.
THREE TECHNOLOGIES AND THREE CARS
There are three suitable technologies. The easiest and cheapest way is to buy a dozen anti-noise aerosol cans and spray the contents. The second option is from socialist times: arm yourself with a jar of suitable mastic and apply the coating with a brush. Finally, the third way is to surrender to the mercy of a specialized service equipped with compressors and primer guns.
How to set up an experiment? Because the different cars Initially, the noise is not the same, and the processing results can greatly depend on the car model, we decided to compare identical cars: the initial conditions should be as close as possible. The brand is of no fundamental importance: you can compare three Mercedes or, say, three Grants ... As a result, we settled on a Chevrolet: in one of the car dealerships, we were given three brand new Cruzes for experiments.
The verification method was chosen as follows. To begin with, we conducted noise measurements of all three cars on a test asphalt road. The noise level was measured in the area of the driver's head at speeds of 60 and 90 km/h; a certified sound level meter Testo 816 helped us. After entering the initial data into the protocol, we went to the repair shop of the same car dealership - with spray cans, cans and pistols. On each car, the bottom and wheel arches were processed, carefully bypassing exhaust system and moving elements. After the materials have dried, they are returned to their place. removed wheels and fender liner, after which we went to the same test road and again called the sound level meter for help.
The results of the battle for silence are shown in the table.
DO NOT MAKE NOISE!
We did not discover America: the cheapest means - an aerosol - practically did not affect the noise level. The difference in the "before" and "after" indicators is comparable to the measurement error. It should be noted that Eltrans preparations are not lucky at all in this issue (see the article about "anti-rain"), but this is not someone's malicious intent, but just an unfortunate coincidence. Thick mastic "AvtoNOL" will color the weekend with new shades. It is inconvenient to use a brush under the car, and it is difficult to achieve an even coating out of habit. If you try, the result will be better than after using an aerosol. Although you need to have a very delicate ear to feel the difference.
But the PRIM Antishum material, which is applied with a primer gun, gives an effect - and it can be assessed not only with a sound level meter, but also by ear. The so-called evacuated microspheres with crumb rubber and other ingenious components significantly reduce the level of noise and vibration in the car. At a speed of 90 km / h, we managed to win almost 4 dBA, that is, the car became quieter by almost two and a half times! The only downside is that it's expensive. Yes, and it is difficult to carry out such work on your own - you will have to turn to specialists.
Experienced, however, say that it is not necessary to go to a car dealership. Like, any garage craftsman will carry out such work for less money - pistols and lifts are not a wonder today, but the drug can be obtained. Let's not argue with that. In any case, the result is important: it is possible to fight harmful "bacilli"! And in addition to reducing the noise level, you will find a bonus in the form of anti-gravel and anti-corrosion protection of the body, as well as its thermal insulation.
In general, do not make noise!
WHAT IS DECIBEL
A decibel (dB) is a dimensionless quantity used to express the ratio of the measured value and the reference value on a logarithmic scale. It is used when measuring values that vary over a wide range: it is much easier to operate with small numbers like 20, 30 or 100 than ratios of 100, 1000 or 10,000,000,000.
Most loud noise differs from the quietest that our ears can catch by 130 dB (10,000,000,000,000 times). The rustle of leaves is about 15 dB, an office with employees is about 60 dB, a motorcycle is about 85 dB, and a traumatic threshold is about 160 dB.
The sensitivity of the ear is highly dependent on the frequency of the sound. Therefore, the so-called A-correction of the sound pressure level is introduced in sound level meters, which brings the measurement results closer to real human sensations. This corrected noise level is also measured in decibels and is referred to as dBA.
A difference of 3 dBA means that the measured value is twice the base value. In the old days, it was fashionable to compare the "Seagull" with the "Muscovites": cool limousine was quieter than a runabout by about 6 dBA!
The editors would like to thank the Avtocenter City company for their help in organizing filming and testing.
Engine noise appears due to leakage and wear of rotating parts. This noise often not only brings sound discomfort, but also affects the performance of the engine.
Reduce car engine noise
Check the alternator belt drive, and if possible, it must be changed. by the very simple option is to ensure optimal tension belt. This will provide less noise, however, to achieve best result you will have to install a roller shoe or a single-row chain with ANC. Such an assembly, unlike the classical one, allows to reduce unpleasant sounds factor of.
Valves make up a third of the total engine noise, the main reason for which is the lack of thermal gap compensation. To eliminate this defect, install hydraulic lifters. However, this is not a guarantee that all noise will disappear.
The noise that appears from under the hood can also be caused by the carburetor, namely the air cleaner system. Carry out the installation of large-sized air cleaners, which are placed in the engine intake system. In addition to their main function of cleaning the air, they will also dampen intake noise.
Against the background of a running engine, the noise emitted by the cooling system is sometimes quite noticeable. To solve this problem, install electric fans that will rotate at a frequency that does not exceed 3500 rpm, which is quite low. Do not forget about the installation of radiator supports in order to decouple the electric motor from the car body. If you do not do this, then getting rid of one noise, another will appear.
Remember that all the measures taken to reduce engine noise will not bring the desired effect if you do not complete soundproofing engine compartment. After all, the sound in a closed space begins to be reflected from the walls and intensify, so the noise will only increase. Carefully monitor the condition of the car, change worn parts in time - all this will help reduce sound activity.
BMW x 1 review, feature
