 Noise insulation, Engineer types opinions needed |
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| nivekdodge |
 Aug 10 2023, 07:12 PM
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Member  Group: Members Posts: 309 Joined: 28-August 21 From: Pittsburgh Pa Member No.: 25,860 Region Association: MidAtlantic Region 
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Just a thought
There's another thread today discussing using perlon for the back pad and if it was quieter or not. Something I've notice is Some GM hood have their inner surface looking like a golf ball. There are 3" round divots and when asked about it I was told it reflects the sound back to the motor and that kills the sound.Anyone know if there is truth to this? This would of course be in the engine compartment. Kevin |
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| 914_teener |
Aug 11 2023, 10:02 AM
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914 Guru Group: Members Posts: 5,266 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
Yes there is truth to it.
Sound is energy and it propagated through the air as "waves" to simplify. When the "waves" hit an irregualr surfuace and particualry a conical surface they are refocused. There are other ways as well to do this..series of irregular holes in perforated metal ect. The size of the dimple depends on the frequency and amplitude of the "wave". |
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Posts in this topic
nivekdodge Noise insulation Aug 10 2023, 07:12 PM
mepstein Perlon is a very lightweight material. You will ha... Aug 11 2023, 06:11 AM vitamin914
Just a thought
There's another thread today ... Aug 11 2023, 07:15 AM
Superhawk996
… designed to reduce head impact forces in a co... Aug 11 2023, 10:42 AM Alain V.
… designed to reduce head impact forces in a c... Aug 11 2023, 04:46 PM wonkipop
… designed to reduce head impact forces in a c... Aug 12 2023, 07:09 AM nivekdodge Like I said, I had heard this in passing and was c... Aug 11 2023, 07:44 AM vitamin914 This got me curious... Head impact protection on t... Aug 11 2023, 03:25 PM Rusty Not sure how much value this will add, but here go... Aug 12 2023, 08:09 AM Superhawk996
Not sure how much value this will add, but here g... Aug 12 2023, 10:59 AM Mikey914
Just a thought
There's another thread today ... Aug 12 2023, 08:26 AM vitamin914
The only way to "kill" noise is to
1- ... Aug 12 2023, 01:32 PM bahnzai
Just a thought
There's another thread today... Aug 12 2023, 07:06 PM Mikey914 I haven't yet, but was going to play with this... Aug 13 2023, 08:53 AM r_towle You can attack the firewall problem but in the end... Aug 13 2023, 09:37 AM Bucci
You can attack the firewall problem but in the en... Aug 13 2023, 10:17 AM Superhawk996
[quote name='r_towle' post='3095382' date='Aug 13... Aug 13 2023, 10:29 AM vitamin914
[quote name='r_towle' post='3095382' date='Aug 1... Aug 13 2023, 11:06 AM Bucci
[quote name='r_towle' post='3095382' date='Aug 1... Aug 13 2023, 11:36 PM Geezer914 I used Perlon on the panel behind the seats and Dy... Aug 13 2023, 09:41 AM Rob-O
You can attack the firewall problem but in the en... Aug 13 2023, 09:44 AM Root_Werks I had a 914 rear window cut from laminated glass o... Aug 14 2023, 10:23 AM |
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