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? . |
bbrock |
Apr 25 2021, 03:04 PM
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#3
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
.. 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? . Dynamat is good for quieting the resonant booming/drumming sound of large panels like floors and doors, it is not good at stopping the airborne drone of an engine. That's where those layers come in. Different sound deadening materials are needed to address different noise sources. And even the constrained layer (e.g. Dynamat) manufacturers recommend adding a dense layer of padding under the carpet. |
bkrantz |
Apr 26 2021, 07:39 PM
Post
#4
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914 Guru Group: Members Posts: 7,802 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains |
.. 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? . Dynamat is good for quieting the resonant booming/drumming sound of large panels like floors and doors, it is not good at stopping the airborne drone of an engine. That's where those layers come in. Different sound deadening materials are needed to address different noise sources. And even the constrained layer (e.g. Dynamat) manufacturers recommend adding a dense layer of padding under the carpet. Right now, I plan to have Dynamat, acoustic foam, and then carpet on the inside. Once I hear it run, I will consider if and what to put on the engine side. |
digit3 |
Jun 27 2021, 07:46 AM
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#5
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Newbie Group: Members Posts: 29 Joined: 23-November 19 From: Tucson Member No.: 23,665 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? . Dynamat is good for quieting the resonant booming/drumming sound of large panels like floors and doors, it is not good at stopping the airborne drone of an engine. That's where those layers come in. Different sound deadening materials are needed to address different noise sources. And even the constrained layer (e.g. Dynamat) manufacturers recommend adding a dense layer of padding under the carpet. Right now, I plan to have Dynamat, acoustic foam, and then carpet on the inside. Once I hear it run, I will consider if and what to put on the engine side. Any updates? |
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