Soundproofing for engine compartment

TracyJel

New Member
Jul 5, 2017
3
Boston
Boat Info
1999 Sea-Ray 260 Overnighter
Venture Trailer
Engines
Mercruiser 7.4 MPI, Bravo III
Hi, I have a 1999 Searay 260 Overnighter
DSC00746.JPG

and I am looking for the engine soundproofing foam. Anyone know where to get it? It has to be approved for use in the engine compartment. tracyjel@gmail.com
 
I am considering this now that I've run my boat an 89 268Da 7.4 and am confident my engine is up to snuff not worried as much about listening for odd noises from the beast below ,I do enjoy the sound of money burning lol but would enjoy a quieter ride now too . What adhesive should I use to attach it to the hatch and underside of the floor.Any pitfalls to avoid?
 
let me know what you end up with and how well it sticks, or the glue you used. I have a few pieces on the hatches that have fallen off and I need to replace. The glue is my concern - has to be string enough to glue to fiberglass, but not melt/dissolve the foam.
 
I'm interested in doing something like this as well. The last piece of my factory sound/heat proofing finally came off so I need to replace it with something. For me, my entire hatch / cockpit floor raises up, so it would be easy to get the sound proofing material adhered to the bottom of it. Would I also need to do the hull sides, or anywhere else? How much of a difference do you all think it would make to cut down on engine noise? Right now, I can't have a conversation while at cruise without yelling, and we have also taken to wearing noise cancelling headphones on really long trips, as it really impacts your ears. If I can cut that down by installing this on the bottom of the floor, it would be well worth it to do.
 
I've previously used a product called "Sounddown". It comes in large sheets with adhesive backing applied. Couldn't be much easier.

You can buy it on Amazon.

I'm interested in doing something like this as well. The last piece of my factory sound/heat proofing finally came off so I need to replace it with something. For me, my entire hatch / cockpit floor raises up, so it would be easy to get the sound proofing material adhered to the bottom of it. Would I also need to do the hull sides, or anywhere else? How much of a difference do you all think it would make to cut down on engine noise? Right now, I can't have a conversation while at cruise without yelling, and we have also taken to wearing noise cancelling headphones on really long trips, as it really impacts your ears. If I can cut that down by installing this on the bottom of the floor, it would be well worth it to do.

What engine speed do you cruise at? Canvas up/down? My admiral and I can hold a conversation from 5+' apart without any yelling at a nice 3200rpm cruise, mid-front glass out, canvas in the back taken off. I wonder if the express is inherently "much louder" due to your engines being further forward? If not maybe you need the sound mat immediately. And make sure the rubber seal around the outside edge is also 100% intact? I'd be pretty annoyed if my boat was "that loud"!
 
We typically cruise at 2300-2400 RPMs, canvas front and sides up (if the weather is nice we'll take the back glass off). The EC is mid-engine, so both beasts are right under our feet. I'm sure some sound proofing needs to be there, I'll check out the Sounddown product.
 
The product Stee mentioned looks decent, but is very thin especially for a diesel boat. I don't remember what thickness we had on our 410DA, but it was much thicker than 10mm and I looked in the parts manual for our 48DA and it's 2" thick. I would think with your CATS you're definitely going to want a much thicker product.

-Tom
 
The product Stee mentioned looks decent, but is very thin especially for a diesel boat. I don't remember what thickness we had on our 410DA, but it was much thicker than 10mm and I looked in the parts manual for our 48DA and it's 2" thick. I would think with your CATS you're definitely going to want a much thicker product.

-Tom
Agreed, I've been reading the Soundown website, tons of info there. They are recommending 1" for gas engines, 2" for diesel. Thickness and Density are the two variables, along with sealing hatches with appropriate gasket material. This could get expensive! :)
 
The product Stee mentioned looks decent, but is very thin especially for a diesel boat. I don't remember what thickness we had on our 410DA, but it was much thicker than 10mm and I looked in the parts manual for our 48DA and it's 2" thick. I would think with your CATS you're definitely going to want a much thicker product.

-Tom

I used 1" thick material...for the record :)

https://www.amazon.com/gp/product/B000N9I08W/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
 

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