Engine compartment insulation

[robmcg]

Any sources for good, cost effective inboard engine sound insulation. The old stuff is just foam covered in some sort of thin black vinyl. The vinyl bit is coming off and the foam is very soft and and not much use. I have used the closed cell black foam that looks a bit like an egg box before but can't seem to find it anymore - maybe it isn't popular anymore ?.

 

[salar]

Don't skimp on the spec or you will waste your money. It needs to be fireproof and do the job of sound insulation. This is what I used from ASAP Supplies Engine Noise Insulation with Lead Barrier (1000mm x 600mm)

 

[Tranona]

Exactly what I am using.

 

[ChromeDome]

Exactly what I am using.

I used the same type on a previous project, 30 mm and 40 dB sound reduction. ISO 3795 compliant.

Not self-adhesive which I preferred as it was easier to fit when not tacking to things before being in place.

Vetus have a multi layer version (£££!) up to 60 mm and Armacell may have alternatives too.

 

[penfold]

Halyard Marine have good stuff, but make sure you're sitting down when you read the price list.

 

[Boater Sam]

i had a load of black 2" thick foam that was made for prison cell mattresses. It was completely fireproof even with a blow lamp.
I have no idea where to buy it now.

 

[oldgit]

Suppliers of non branded sheet on ebay.
Boat / Marine Soundproofing Foam | eBay
It used to be free delivery as well,so no need to go to chandlery.

 

[dankilb]

Foam on its own doesn’t have the high-density sound deadening layer (often lead) that OEM and ‘marine’ engine sound insulation has.

I think this stuff comes in slightly cheaper than the ASAP sheets:NoiseKiller Lead Sandwich Material - NK Group

 

[Zing]

I bought mine from Halyard. No complaints.

 

[ChromeDome]

i had a load of black 2" thick foam that was made for prison cell mattresses. It was completely fireproof even with a blow lamp.
I have no idea where to buy it now.

Might be fire & fart proof but will it reduce engine noise? ?

 

[robmcg]

Sounds like I had better start checking down the back of the sofa then ?

 

[dankilb]

Sounds like I had better start checking down the back of the sofa then ?

I’ve wondered about a budget DIY solution by creating a laminate between class O (fireproof) closed cell foam and butyl roofing ‘lead’ replacement. But it still wouldn’t be cheap-cheap and it may not work as well.

On the plus side, how long has the current insulation lasted? Ours was removed at 30 years during re-engining. Replacement is still on this winter’s jobs list.