[tcb] Re: Sound Dampening A
- From: "w.wood" <evil.scientist.boo@xxxxxxxxx>
- To: tcb@xxxxxxxxxxxxx
- Date: Tue, 12 Apr 2011 07:04:38 -0400
Oh yeah or a dub with SOLID MOUNTS
On Apr 12, 2011 5:11 AM, "sammie smith" <bugcollections@xxxxxxxxxxxxx>
wrote:
> I was gonna to offer to let these "noise" guys have a ride in my baja,
after which they would think a bus even at 100db sounds like taking a ride
in a hearse. And as far as affecting your hearing, you just learn to say
"what'd you say" a lot.
>
> --- On Mon, 4/11/11, w.wood <evil.scientist.boo@xxxxxxxxx> wrote:
>
>
> From: w.wood <evil.scientist.boo@xxxxxxxxx>
> Subject: [tcb] Re: Sound Dampening A Bus
> To: tcb@xxxxxxxxxxxxx
> Date: Monday, April 11, 2011, 10:14 PM
>
>
> ear plugs.
>
>
>
> On Mon, Apr 11, 2011 at 10:55 PM, kelly dosch <kellydosch@xxxxxxxxx>
wrote:
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> Thanks for that. I was hoping that doing the floor was the ticket to
road noise reduction. I might even undercoat it.
> Genius idea to put the insulation in big freezer bags! (to avoid
moisture retention, I assume)
>
> --- On Mon, 4/11/11, David Schwarze <dschwarze@xxxxxxxxxx> wrote:
>
>
> From: David Schwarze <dschwarze@xxxxxxxxxx>
>
> Subject: [tcb] Re: Sound Dampening A Bus
> To: tcb@xxxxxxxxxxxxx
> Date: Monday, April 11, 2011, 10:28 PM
>
>
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> I have been experimenting with sound deadening lately out of necessity.
With the old air-cooled motor, the sound of the engine running was somewhat
endearing and only left a slight ringing in my ears after several hours on
the interstate. With the TD engine, it's a whole new, much noisier world.
The unholy racket coming from the engine was unbearable and I'm sure would
have done permanent damage to my hearing on long trips. My sound meter was
registering over 100db in the drivers seat.
>
> First I filled the cavity behind the rear seat with pillows, blankets, old
clothes, towels, etc. and put two pillows up against the C-pillars. This
did not help much at all.
>
> Next I covered parts of the walls and floor with Q-pads. I also removed
the paneling, stuffed 1 gallon freezer bags with pink insulation and used
them to fill the cavities, then replaced the paneling. I also put the heavy
rubber floor mat back into the cargo area followed by a layer of carpet jute
and then a layer of carpeting. Those changes resulted in the nice thunk-ing
doors that Kelly mentions and a slight reduction in noise level, but still
way too high. High enough that I was wearing headphones, except that they
didn't work because the noise was a low-frequency drone that went right past
them.
>
> Next I removed the front transaxle mount and made a new one that uses a
lot more rubber. This made a big difference at highway cruising speed but
when I push the RPMs up to passing speed, it is still way too loud.
Fortunately the noise is tolerable if I hold it to no more than 62mph.
Still way louder than a stock air cooled motor though.
>
> Finally I had a friend sit in the back of the bus and listen for noisy
spots. Surprisingly, most of the noise was coming from the floor just
behind the bulkheads. There were already Q-pads in this area. I went to
Home Depot and bought 8 bags of topsoil and arranged them strategically to
cover the entire floor. Bingo! I could hear myself think again. I
considered leaving the dirt in there, maybe planting grass as a floor
covering but the 320lbs of added weight was a little excessive. I took out
the dirt and bought a sheet of 3/4" birch plywood which I will attach to the
floor over the Q-pads and under the carpet jute. A guy on another list did
say that the biggest reduction in noise in his bus was when he installed a
hardwood floor so I'm hoping it will come close to the noise reduction of
the topsoil.
>
> I figure that if I put the stock aircooled engine back in my bus now, I
wouldn't be able to hear it over the wind noise. But I will never know for
sure.
>
> -David
>
> On 4/11/2011 1:41 PM, kelly dosch wrote:
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> Well I can't tell a difference yet, but I have a lot more work to do. I
need another roll to do the entire floor. I also want to put that silver
foil bubble wrap under the carpet. When the AC is running you can feel a LOT
of heat rising up off the floor. All that will have to wait until after The
Classic.
> Just four more days!!!! WEEEEE! Woop! I just piddled a little.
>
> --- On Sun, 4/10/11, Cari Smith <cariandpaul@xxxxxxxxx> wrote:
>
>
> From: Cari Smith <cariandpaul@xxxxxxxxx>
> Subject: [tcb] Re: Sound Dampening A Bus
> To: tcb@xxxxxxxxxxxxx
> Date: Sunday, April 10, 2011, 9:11 AM
>
>
>
> Cant wait to hear your road test results
> On Apr 9, 2011 11:57 PM, "kelly dosch" <kellydosch@xxxxxxxxx> wrote:
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> So I just bought a roll of sound dampening stuff, started installing it
on my bus and thought I would share my results, in case any of you have
considered it but were not sure if it was worth the trouble.
> First, let me just say, it is. Holy crap.
> There are a lot of sound deadening products out there, but I just went
with a cheap roll of Window Wrap from the lumber store. Same crap, lower
price.
> It is a film of some kind of rubber/tar compound on a foil backing, peel
and stick. Only about 1 millimeter thick and the sales person assured me it
won't melt and run even at the high temps in a parked car.
> One $20 roll is enough to do all your doors and rear hatch, over the
engine and maybe under the Z-bench.
> All that bare metal in a bus just picks up vibrations and reverberates
it everywhere. This gooey film absorbs and dampens those vibrations.
> I was skeptical, but I tried it anyway because I was tired of my doors
sounding like slamming the lid down on a dumpster every time I closed them.
It was making me wince.
> Well. Now my door slams shut with a wonderfully satisfying *thunk* and
no tinny reverb. It gives the illusion of solidity and I don't care if it is
illusion or not. It sounds and feels great.
> What I really did not expect was the stunning improvement of the sound
quality from my door speakers.
> I know this stuff is made to improve your stereo's sound, but I really
did not expect much difference. Surprise! It's like I upgraded my speakers
or something. And I haven't even done the passenger door yet!
> I haven't yet tested it on the road so I can't tell how it works on road
noise yet. I still have to do the cargo door, passenger door and under the
seat.
> But I can say so far, it was worth it for the muffled satisfying *thunk*
of the driver's door and the improvement in the sound of my music already.
> I will eventually be doing the floor under the carpet for sure!
> They say a lot of road noise comes from the tranny and to double it up
on the floor between the seats. I can't wait to try it but that will have to
wait until after The VW Classic.
>
>
>
> --
> My Email Moniker
> http://www.findinternettv.com/Video,item,1570570433.aspx
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