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  #11  
Old 11-12-2013
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Re: Best way to soundproof engine compartment?

You have resurrected a very old post but here is a link to the product I sell in Canada. I am not sure where you are located. The link is from Jamestown Distributors in the US. It is a high density fireproof foam in 2 layers with a mass loaded vinyl between them. It is covered with a foil surface and a which is easy to keep clean. It is sold with a mounting system and usually contact cement is used as well. It should be available where you are located. Hope this helps.

Soundown Composite Insulation Vinyl/Foam Sheets

Here is a link to a pdf showing the product details.

http://soundown.com/Section%202%20PD...nyl%20Foam.pdf
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Last edited by mitiempo; 11-12-2013 at 01:25 AM.
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Old 11-12-2013
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Re: Best way to soundproof engine compartment?

I lined the engine compartment hatch with 1" foil faced fiber-glass duct board. Creative use of *real* aluminum foil duct tape sealed the edges and reinforces the mastic which fastens it to the 1/4" ply.It works so well that I intend to apply it to the entire compartment....some day . The compartments bulkheads are plywood; so a few screws with fender washers to keep it in place till the mastic sets is all it will take. Then a contortionists game applying tape to the joints/seams.....
Avail. at most HVAC suppliers and possibly by order at big-box stores?

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Old 11-12-2013
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Re: Best way to soundproof engine compartment?

Without the mass loaded high density layer the low frequencies of the diesels will not be reduced to a low enough db level.
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Last edited by mitiempo; 11-12-2013 at 09:53 AM.
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Old 11-12-2013
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Re: Best way to soundproof engine compartment?

I used the Soundown stuff, 1" thick, except under the cockpit sole, where I doubled it to 2". Honestly, the main noise is now from the exhaust, when under way. I would seriously like to do something about that. I have been wondering if my 30 year old silencer box is losing some effectiveness.
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Old 11-12-2013
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Re: Best way to soundproof engine compartment?

Quote:
Originally Posted by mitiempo View Post
You have resurrected a very old post but here is a link to the product I sell in Canada. I am not sure where you are located. The link is from Jamestown Distributors in the US. It is a high density fireproof foam in 2 layers with a mass loaded vinyl between them. It is covered with a foil surface and a which is easy to keep clean. It is sold with a mounting system and usually contact cement is used as well. It should be available where you are located. Hope this helps.

Soundown Composite Insulation Vinyl/Foam Sheets

Here is a link to a pdf showing the product details.

http://soundown.com/Section%202%20PD...nyl%20Foam.pdf
This is same stuff I have been considering for my generator cabinet. It's one of my winter projects. Unfortunately it's a bit on the expensive side, but it is the correct product to use.
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Old 11-13-2013
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Re: Best way to soundproof engine compartment?

An ambulance boat is such a novel concept.

Can you tell us if this is all a custom build?

What the range and speed are, and the intended area of operation?
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Old 11-13-2013
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Best way to soundproof engine compartment?

What about neoprene ? It is supposed to be oil resistant, water resistant; it's the same material scuba diving suits are made.


One can purchase sheets: various sizes and thickness.
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Old 11-13-2013
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Re: Best way to soundproof engine compartment?

Deric, I think neoprene would be good for damping vibrations, but it doesn't have the mass to absorb and dissipate the sound energy.
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Old 11-13-2013
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Re: Best way to soundproof engine compartment?

There are 2 kinds of marine engine compartment insulations. One is for gas, the other for diesel. I just re-did my doghouse... it's not that hard. Good sturdy putty knife took off the old stuff. Sanded down the old glue spots with big grit paper. Use spray glue in a can MADE FOR FOAM. Found a can at my local hardware store. The new insulation (as mentioned) is pricey. Don't skimp if you can, you'll be glad you didn't. Cuts with a good heavy pair of scissors (might have to borrow your neighbor's jocko kid though) :-)

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Old 11-13-2013
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Re: Best way to soundproof engine compartment?

Neoprene foam is dense, but it is also expensive and flammable. And the less expensive "chemical blown" neoprenes tend to degrade faster in heat, i.e engine rooms.

If it was the right material for the job you'd see it used on production boats.
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