Classic cars forum & vehicle restoration.

Ellis · Posted: Thu Oct 09, 2014 6:29 pm Post subject: Dynamat sound proofing.

Can I have some advice please.

Series Land Rovers are noisy! Especially with a powerful Discovery engine.
I will be changing the front bulkhead on mine soon for a rust free one I bought a few years ago and while the Series 2 is dismantled I am going to try to soundproofing it.

Dynamat is one system I am looking at and I ask whether any of you forum members have any experience of it or it's competitors.

Thank you
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Starting Handle Expert

1964 Jaguar Mark 2 3.4 litre
1962 Land Rover Series 2a 88"
2002 BMW M3 E46 Cabriolet

62rebel · Posted: Fri Mar 20, 2015 2:52 am Post subject:

Dynamat works well but is costly; there might be a cheaper alternative in your local lumber/home supply store in the roofing section; our locally available stuff is called "peel-n-seal". it's made of a bitumen-like substance backed with a tough aluminium foil. it molds to contours fairly easily, and sticks like ..stuff.. on a blanket. you have to take care placing it as it will not come off to reposition, and you have to be mindful of seams that should be taped off as well; i use the aluminium foil tape to do that. it might be best to get a sample if possible as SOME brands of this material do give off a tar odor when they get hot, at least until they're aged some. you might find it intolerable and have to peel it all out and have no kind words for my advice later on......
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nothing is ever so far gone as to be unsalvageable. see this bolt?.....

ka · Joined: 03 Dec 2007 Posts: 600 Location: Orkney.

Reading this a thought; would the expanding foam builders use provide a sound deadening capability?
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KA

Better three than four.

Bitumen Boy · Posted: Fri Mar 20, 2015 10:01 am Post subject:

Rick · Site Admin Joined: 27 Apr 2005 Posts: 22450 Location: UK

Dipster · Posted: Fri Mar 20, 2015 7:40 pm Post subject:

And it is quite inflamable too!

MikeEdwards · Joined: 25 May 2011 Posts: 2473 Location: South Cheshire

I've used some closed-cell foam to replace some of the felt on the bulkhead of my car. To be fair I can't really say whether it makes that much difference or not, but at least if the car gets water in, the foam won't soak it up.

I'm a bit reluctant to stick anything to the floor because I'm obsessed with taking it all out every few years (well, every ten years) to make sure the floor is OK. That probably limits just how quiet I'm going to make it, but then a lot of it is wind noise from the windscreen pillars and drip rails.

Sealing around the bonnet might help reduce noise from the engine bay - I was reading a forum post about removing the rubber strip across the back of the engine bay on my modern (at the base of the windscreen) to reduce underbonnet temperatures, and several posters mentioned that they had a lot more engine noise after they did so. And that's with modern levels of soundproofing on the bulkhead as well. Of course, the converse is that if you seal around the bonnet, you might increase the temperature.

kevin2306 · Posted: Fri Mar 20, 2015 9:27 pm Post subject:

62rebel · Posted: Fri Mar 20, 2015 10:43 pm Post subject:

never use it to fill a void, though. it will invariably trap moisture and welcome rust to the party.
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nothing is ever so far gone as to be unsalvageable. see this bolt?.....

Dipster · Posted: Fri Mar 20, 2015 10:58 pm Post subject: