[Haroundb]

This is the question, my W123 doesn't have a bonnet padding which is the thick piece of rag or special material that is covering the inside of the bonnet. I want to install one, but just for my information will this thing reduce the noise inside the car or will it only reduce it outside only? I mean who is sitting inside the car will notice the reduced engine noise or will it be only noticed from the outside while standing next to the car with the engine running?

The thing is that I don't get it how will it reduce the engine noise, sense logically the fire wall is the place which passes engine sound to the inside of the car.

 

[Cyberbach]

I think you'll hear more engine noise without the pad as it escapes through the hood (bonnet) and it reverberates through the glass windshield. I know what you are saying about the firewall but I removed the old hood pad in my current repair and haven't installed the new one yet until I get the car painted and I noticed the noise is quite a bit louder.... both inside and out.
Your Parts Search Returned 1 Part(s)

 

[MBeige]

On the forum it's called the "hood pad" and if you do a search, you'll find your answers. Yes, it drowns some noise especially if you've been accustomed to it not having a pad.

On the w124 the secondary firewall was added to further reduce engine noise and that's primarily how they solved it. The w123 did not have that feature, but good seals (door seals, insulation under the forward floor board, etc) should also keep the noise down.

 

[Haroundb]

On the forum it's called the "hood pad" and if you do a search, you'll find your answers. Yes, it drowns some noise especially if you've been accustomed to it not having a pad.

On the w124 the secondary firewall was added to further reduce engine noise and that's primarily how they solved it. The w123 did not have that feature, but good seals (door seals, insulation under the forward floor board, etc) should also keep the noise down.

Can we add a secondary firewall in the W123? If possible, give me your ideas...And really thanks for the info.

 

[Haroundb]

I think you'll hear more engine noise without the pad as it escapes through the hood (bonnet) and it reverberates through the glass windshield. I know what you are saying about the firewall but I removed the old hood pad in my current repair and haven't installed the new one yet until I get the car painted and I noticed the noise is quite a bit louder.... both inside and out.
Your Parts Search Returned 1 Part(s)

That was really a nice explanation and a hell of information.

 

[MBeige]

Adding a 2ndary firewall to the w123 will be very tedious because the forward edge of the windshield juts forward a good what, 6 inches, before it falls down to become the firewall. On the w124, that space in front of the windshield is used and that's where the 2ndary firewall is, and grows outwards to both suspension towers and forward of them to the fenders. It will be a lot of work, to get that firewall done correctly. Plus, the w124 already has them, so it would be cost effective to just get a w124 (like we did )...

 

[Haroundb]

Adding a 2ndary firewall to the w123 will be very tedious because the forward edge of the windshield juts forward a good what, 6 inches, before it falls down to become the firewall. On the w124, that space in front of the windshield is used and that's where the 2ndary firewall is, and grows outwards to both suspension towers and forward of them to the fenders. It will be a lot of work, to get that firewall done correctly. Plus, the w124 already has them, so it would be cost effective to just get a w124 (like we did )...

Now I know that you have knowledge so please be more elaborating in telling me how to do it...Let the tedious and difficult job be our motivation and challenge !

Please tell me more about the ability of making a 2ndry firewall to my W123!:thumbsup:

 

[MBeige]

I did not say I have the knowledge, I just compared the 123 and the 124. I cannot tell you how to do it, because I've never tried it myself.

 

[Haroundb]

I did not say I have the knowledge, I just compared the 123 and the 124. I cannot tell you how to do it, because I've never tried it myself.

Let us say, any information is highly appreciated

 

[MBeige]

Your favorite body shop should be more knowledgeable.

 

[Haroundb]

OK thanks anyway!

 

[P4olom]

you can try this mod if you so please

the Ol' Diesel-Benz car hole W123 W124 W126 Mods, Tips, Hacks, & More

 

[Haroundb]

you can try this mod if you so please

the Ol' Diesel-Benz car hole W123 W124 W126 Mods, Tips, Hacks, & More

Thanks man for the infor... I appreciate it!

 

[Chaw]

Strangely, I enjoy unusually loud cars. As long as all exhaust components are rust-free and in proper operation; a smooth running, noisy MB reminds me of two things:
1) I'm not driving some newer car that you only know is running because of the tachometer reading.
2) MB's long and successful history with industrial trucks, Unimogs, etc. passed down to the design of your classic car.

BTW, I do not have a hood pad on my ride either. It fell off and I have yet to replace it. It seems other projects have much more importance, IMHO.

 

[blackcat1134]

I just replaced the hood pad on mine perhaps a week or so ago. It's wonderful! My old one would disenigrate in your fingers if you were to touch it, and I was just afraid of it being a fire hazard since there was a cocktail mixture of fluids that had been absorbed in it.

Anyway, I noticed that yes it does quiet down the engine noticibly on the freeway more so than in daily driving. and on the plus side, it keeps the engine warmer in colder weather, and heats up MUCH quicker than without the hood pad.

I'd reccomend one, but if you're installing it yourself, be prepared to have tennis elbow or something like that when you're done. It's a lot of hard work trying to sand off all that old glue and crap stuck to the inside!

 

[Gregs300CD]

There is a limited ammount of sound absorbing padding under the dash. That could be increased if necessary. You should also make sure all of the rubber sealing cups on the firewall (including the steering column boot) are intact.

 

[108Benz]

I notice that you are running a 1983 200 gasser. They must be a lot quieter than a diesel with no hood pad. re you more concerned about the noise when idleling or driving?. When driving there are more noise coming into the interior compartment than just engine noise. There is road noise, wind noise etc.
A few things I've done in the past with both gassers and diesels is spray on or brush some undercoating onto the underside of the hood and then put your hood pad on. Although most of my hood pads from various cars have had several clips that had to be removed .They were not gluded on like the MB's. I have also just put the undercoat on with no pad after letting it dry for at least 24 hrs. I have never had it melt off due to engine heat.
Another thing I did was put some bubble wrap. thin packageing material under the floor mats that go up from the gas pedal.brake pedal into the inside firewall as far as I can go. This can queit dowm some of the engine/road noise coming into the cabin.
If your wheel wells are still relativily clean and free of dirt you can pressure wash the inside of them , let them dry and then also sray the undercoat into the wheel well area of all four corners. This will cut down some road/tire noise a bit.
Every little bit helps.

My 2 cents worth

 

[DOUGLAS MARTIN]

Where can one purchase the Engine Sound Shield featured on the DieselBenz web site? Web site has no info and I cannot find any listing for manufacturer listed on web site.

 

[Lorbenzo Lammas]

Has anyone tried any type of material that can be bought for cheap at some place like Home Depot? I think that metallic bubble wrap stuff would work great, but I bet it's conductive, and might cause some trouble should it come unglued and touch the battery terminals. I mainly want something to keep my hood's paint from deteriorating from the heat.