Sound deadening

[weimarbus]

Hi, I used products from a company called 'noisekiller' to sound proof my van and did the whole of the front floor area, doors, and roof also but alot of noise comes from around the front panel where ther are large passages to the outside these I blocked by screwing up 12mm thick foam and it made a huge difference the dash top also resonates a great deal so it is worth using deadening pads on the underside. our van has a fibreglass hi top but we can now here the radio at reasonable motorway speeds.

[Si_P]

Please do not be taken in by the hype of heavily branded products. Acoustics is my trade (a consultant don't cha know). There is no magic wand. Standard cheep building products will do as much as any branded product. As previous posts have said to stop noise you must eliminate gaps increase the mass, isolate the source of noise and potentially look at pannel stiffness.

Stopping holes and increasing the mass will be the simplest methods by a long way.

[HarryMann]

some m bikes are geared so high earplugs are essential.

Uh!Gearing, not sure waht you mean

[Plasticman]

. always wear headphones when using neumatic drill etc...

what music do you listen to on thbe headphones?
mike

[JamesT25]

Thought i'd follow this thread up with some pics, finally got around to sound deadening and carpeting my interior.

Newton commercials do offer a custom fit carpet set for the front of the vehicle but with my stubborn head on decided how hard can it be to make the carpet fit so bought 50sq feet of bitumen with foil for adding weight to the panels and a roll of carpet hopefully the pics will help explain what I am doing.

1. Added panels of the sound deadening stuff to the doors as much as i could fit really
2. Added strips of sound deadening to the "grooves" in the floor to make the floor a little more level
3. Added strips of underlay to make the grooves the same level
4. Covered with a liberal ammount of carpet and then trimmed to make fit

I am about half way through so far and it is going well. The front footwells etc I think will be the most awkward but I am up for it

Anyways here's some pics and if anyone has some advice on noise cutting it would be appreciated

http://imageshack.us/photo/my-images/94 ... 40102.jpg/
http://imageshack.us/photo/my-images/85 ... 40118.jpg/
http://imageshack.us/photo/my-images/23 ... 40130.jpg/
http://imageshack.us/photo/my-images/22 ... 40145.jpg/
http://imageshack.us/photo/my-images/56 ... 01741.jpg/
http://imageshack.us/photo/my-images/86 ... 01749.jpg/
http://imageshack.us/photo/my-images/42 ... 01807.jpg/
http://imageshack.us/photo/my-images/60 ... 01928.jpg/
http://imageshack.us/photo/my-images/59 ... 01933.jpg/
http://imageshack.us/photo/my-images/85 ... 11728.jpg/
Cheers

James

[Si_P]

Thats looking top draw. Nice job.

I'll be very interested to hear what improvement you get.

[HarryMann]

James,

They won't show for me currently.. tries to load partner.googleadservices and fails (it seems)

maybe I should wait longer than one minute ??

[JamesT25]

still not finished yet but there is definately an improvement, sound has been significantly dulled. no more rattles but I still have excessive wind noise between 65 and 80 can get quite load. I know these buses werent exactly designed with aerodynamics in mind but I must be missing something as it sounds wrong

will keep investigating and report back, next job is to add the "cardboard" to the side of the rad at the front and see if that helps

[fidget]

Hi mate

where did you get the carpet from? its just what Im looking for

James

[JamesT25]

a local company who makes car mats http://www.ambassadorcarmats.co.uk/" onclick="window.open(this.href);return false;

they sold me a 5x2metre roll for £50 think it was because it was in stock and I popped in.

Nice and easy to deal with

[HarryMann]

Oh, right. Highly geared is the more normal way of expressing gearing that gives a lot of speed for the revs, rather than little

So gearing that doesn't gear up a lot, where you get a lot of revs for a low speed would be called 'low' gearing, not high... (and the gear number would be low as well, e.g. 1st gear)

I can see the derivation though, a high gear ratio, but unfortunately that ratio is effectively an inverse one, say for our reverse gear 6.16:1 as opposed to 1: 6.16

Was confused by that and the odd association with noise and earplugs (I suppose so though - more revs, more noise)

Lets face it, we normally speak of 'going up a gear' to a higher gear (even though the actual ratio is lower in number)

Gets very confusing when one group talk about it one way and another use the opposite.