Sound deadening a Defender

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Originally Posted by W&KO

Hmm...carpet under lay is different to sound deadener, ya might want to clarify the product you refer to when posting.

Have it all sorted not

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I can read what it says on the box.

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Originally Posted by Standard

YouTube

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That wasn't too bad from a technical standpoint.
He's got the idea of the panel resonance right, but in my opinion he's still using way too much dynamat.
Dynamat and similar products are supposed to be damping pads, or a constrained layer damping, and the idea is to add just enough to stop the panel resonating.
By adding too much, you go past the point of damping the panel and just end up mass loading it. It still works, just adds unnecessary weight. And cost. Especially if you're then putting mass loaded vinyl over the top anyway.

I've been looking through the 'what are you doing in the lockdown' threads and maybe I should make use of the isolation time (and 20+ years as an NVH engineer in the auto industry) to do a write up on making a Deafener less deafening!

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Originally Posted by DieselDan

That wasn't too bad from a technical standpoint.
He's got the idea of the panel resonance right, but in my opinion he's still using way too much dynamat.
Dynamat and similar products are supposed to be damping pads, or a constrained layer damping, and the idea is to add just enough to stop the panel resonating.
By adding too much, you go past the point of damping the panel and just end up mass loading it. It still works, just adds unnecessary weight. And cost. Especially if you're then putting mass loaded vinyl over the top anyway.

I've been looking through the 'what are you doing in the lockdown' threads and maybe I should make use of the isolation time (and 20+ years as an NVH engineer in the auto industry) to do a write up on making a Deafener less deafening!

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I would be very interested in your input, as I'm sure many others would be as well.

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Originally Posted by ramblingboy42

I can read what it says on the box.

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I can read as well, across three threads Mick mentions make sure you get the water proof stuff however doesn’t clarify that he is talking about carpet underlay.

Most posts are about dedicated sound deadener that goes down first...well that’s the way I interpret the threads.

Interestingly car builders replied to my inquiry that they don’t recommend the water proof carpet underlay under vinyl type floor in defenders.

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Originally Posted by Standard

I would be very interested in your input, as I'm sure many others would be as well.

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I've had a go. Hopefully it's not too dry and dull :zzz:

How to make a Defender Quieter

Looking at the Car Builders website, its certainly changed since I bought from them.
They just had a 4WD section then, with waterproof stuff, but now they have a specific Land Rover Defender pack, with several products for various parts of the vehicle.
One of the products appears to be the closed cell one I bought for the floor. I didn't bother with the roof or sides.
I still wouldn't want to put anything on the floor which could get soaked and sit there causing rust. Defenders are known for leaking and we do get water in the front passenger footwell occasionally.
The floor and firewall meet at the front of the front footwells and it is a known rust area.
Anyway, you must make your own decisions.

Land Rover 110 Floor pan sound and insulation packs