 Sound Deadening, Advice/Opinions for engine bulkhead |
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| Bullethead |
 Apr 1 2023, 11:15 AM
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#1
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Oil Cooled heart  Group: Members Posts: 913 Joined: 24-June 10 From: South Florida Member No.: 11,875 Region Association: South East States 
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I know this subject has been covered many times, but let's beat a dead horse...
Finalizing some things before installing the wiring harness on my GT build, and need to make a decision on sound and/or heat control. Suggestions or opinions on the best materials for this and installation tips greatly appreciated. For instance: better to install on the engine bay side? Less effective if on the cabin side? Etc., etc. Interior bulkhead will be covered in Perlon, floors will be rubber mats. It won't be a quiet place, but a little mitigation is the goal. Thanks for any advice the 914 World brain trust might offer. These threads cover a lot, but which materials are best? http://www.914world.com/bbs2/index.php?showtopic=342295 http://www.914world.com/bbs2/index.php?showtopic=361863 Who has one of these? https://www.rix914parts.com/store/p29/914_F...uction_Mat.html Is this material available in sheets to apply to the interior ? |
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Replies(1 - 4)
| live free & drive |
Apr 1 2023, 01:17 PM
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#2
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Member Group: Members Posts: 181 Joined: 29-June 16 From: New Hampshire Member No.: 20,159 Region Association: None
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If you look at the below linked thread and slide down to Roblav1's post you will see his use of 80% wool gray felt (1/4"?) from Mcmaster over Dynamat. This looks like a nice solution and look:
http://www.914world.com/bbs2/index.php?sho...359&hl=wool McMaster page: https://www.mcmaster.com/catalog/129/3984/9248K222 |
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| 914sgofast2 |
Apr 1 2023, 01:40 PM
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#3
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Senior Member Group: Members Posts: 653 Joined: 10-May 13 From: El Dorado Hills, CA Member No.: 15,855 Region Association: None |
I used the self adhesive Noico sound pad’s found on Amazon. Come in black or shiny aluminum finishes. Easy to install and trim. Still working fine after 3 years.
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| Superhawk996 |
Apr 1 2023, 04:56 PM
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#4
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914 Guru Group: Members Posts: 6,589 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(Bullethead @ Apr 1 2023, 12:15 PM)  These threads cover a lot, but which materials are best? There is no one best material. Material selection depends on frequency of the noise and whether it is transmitted through the structure or through the air. NVH Generalization: Mass damping and constrained layer damping for frequency < 100 hz transmitted structurally. Example: floor pan transmitted noise coming in through the suspension. Barriers and absorption for frequencies >100 hz that are transmitted through the air. Example: high pitch alternator whine, 911 fan noise, 914 fan noise, tire sizzle noise, valve clatter, etc. |
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| r_towle |
Apr 1 2023, 05:42 PM
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#5
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Custom Member Group: Members Posts: 24,656 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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I would suggest all.
Spray on lizard skin (ceramic spheres in paint) Dynamat inside and out Wool mat Rubber liner That covers many/most frequencies and stops the vibrations. The last bit is the glass, which is what it is. |
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