sound deadening, engine compartment pad |
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sound deadening, engine compartment pad |
dlindzey |
Apr 25 2021, 08:49 AM
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#1
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repeat offender Group: Members Posts: 33 Joined: 8-April 14 From: texas Member No.: 17,226 Region Association: Southwest Region |
there are at least two different versions on the usual parts sites-
aase $200 pelican $125 AA $200 any practical experience or obvious best choice in taking care of this need? |
Literati914 |
Apr 25 2021, 02:49 PM
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#2
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Senior Member Group: Members Posts: 1,475 Joined: 16-November 06 From: Dallas, TX Member No.: 7,222 Region Association: Southwest Region |
.. Look at what stock is, look at the whole thing. hard rubber outer with the fiber (horsehair?), then the steel but your not done. The other side you have the fitted rubber/tar sheet glued to the firewall and the whole back pad. You take away any part of that sandwich and it will add noise. To me just some dynamat or whatever is crap, I'd look to replicate that sandwich with modern materials. It's going to have some weight, if it's a street car you have to live with that fact. I've had two 914s with stock engine side pads.. both just seemed like loose-fitting, worn out rubber sheeting to me.. I didn't notice any layers to them. Maybe those were something other than stock (IMG:style_emoticons/default/confused24.gif) , IDK.. then the other side (you mean the back-pad side?), neither cars had anything between the back pad and fire wall. I'm sure layering would be effective at noise tho. Maybe dynamat on both sides? . |
Mark Henry |
Apr 25 2021, 03:36 PM
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#3
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
I've had two 914s with stock engine side pads.. both just seemed like loose-fitting, worn out rubber sheeting to me.. I didn't notice any layers to them. Maybe those were something other than stock (IMG:style_emoticons/default/confused24.gif) , IDK.. then the other side (you mean the back-pad side?), neither cars had anything between the back pad and fire wall. I'm sure layering would be effective at noise tho. Maybe dynamat on both sides? . Then you have tar pad, steel, tar pad...IMHO that's wrong. You need a tar pad, steel, foam pad and then rubber pad. Maybe use some heavy rubber roof liner, but I don't know if that material is fireproof enough. The dynamat will work as part of the sandwich, as does the stock back pad. The engine bay has to have something that replicates the stock pad. You could try stripping out the horse hair for the stock pad and glueing in something like a closed cell foam. I'm no sound engineer but anecdotally I know it's the sum of the layers that reduces noise, not any one layer. BTW also make sure the glass is sealed. My /6 conversion I used the stock backpad, but I reglued it and made sure the big plastic washers were secure. I now notice that the mid-seam each side is starting to loosen so I plan to secure them as well, maybe with a strip of 1/8" alunimum. My weber carb /6 is not noisy at cruise, you can easily have a conversation without shouting and there's no drone. But the engine is loud, so I know the sound deading is for sure working. |
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