W110 Heckflosse Project (1966 200) - Page 15 - Mercedes-Benz Forum

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post #141 of 144 (permalink) Old 10-28-2015, 03:47 PM Thread Starter
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Date registered: Jun 2010
Vehicle: 1966 MB 200; Porsche 914 (6); Porsche 914 (Chev 350); 36 ford
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From what I understand, the sound deadening material, is more of a damper, and not insulation (absorption) against sound. So, even a small patch on a large flat panel will dampen or reduce the resonant frequency of that panel, hence quieter. Also, will dampen any reflected sound waves.

The secondary affect is absorption, resulting in a reduction in noise. I could not find any numbers about the amount of absorption, even on the dynamat site...

So, using this facts, you don't need to "seal" the entire surface, and as Nate suggested, it's fine and best to leave some gap from certain areas.

And if overall noise is the goal, the underhood seems to be the biggest offset. (Surprise!)

Reference: Putting Dynamat to the Test in a Ford F-150

It's going to be interesting, and I want to do this in steps and see the affects. The one recommended area, that I will not be doing, is the headliner. Sometime in the future, when I get that redone, I will install mat there. but not before.

Would be interested in any ideas. (and counter-ideas.)

-- brett
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post #142 of 144 (permalink) Old 10-29-2015, 06:27 AM
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Post Quietude

Just so Brett ~

The idea is to halt the sheet metal's tendency to drum .

For temperature control , it's best to create dead air in the doors , etc. by using those plastic sheets .

You'll find the roof panel is an important spot to have insulation against noise but I never touch a good original headliner to install it , only when I'm having it replaced do to wear /rips .
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-Nate
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post #143 of 144 (permalink) Old 10-29-2015, 02:18 PM
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Date registered: Oct 2006
Vehicle: 1965 220SE sedan (finnie) with 450SE conversion, 1964 220SE coupe project, 1966 300SE coupe
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I found in my black V8 finny that it was getting very hot, and having under-bonnet insulation was making things worse, so I removed it. But the coupe is getting a 280SE motor (that I hear are also prone to getting a bit hot), so I will see what the noise level is like before doing anything there.
As for the roof, well I did that on the black finny too - but with the heat it gets, I am guessing that some of the insulation must have released, as now when I open my sunroof I get drag marks of the green glue used on the insulation. So that did not go too well.
Cheers, Drew
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post #144 of 144 (permalink) Old 11-01-2015, 05:38 PM Thread Starter
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Not much progress, as it's mostly prep and getting the interior apart.

A couple of pictures showing the extent of the "hole" that was required to fit the 6 speed. I have a picture with the crude cover and without it. So, it's pretty obvious why it's so noisy in the car.

One other small thing that is annoying, I tore one of the seats as I was getting it out. that should not have happened. It's just cheap re-upholstery on the old seats. Very, very thin material.

Only had a couple of hours this week to work on it. So, this will be slow progress.

-- brett
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