Engine Cover Batting material - where / what to get...

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McFly
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Joined: 10/22/18
Posts: 200
Engine Cover Batting material - where / what to get...

Hi there, the fire proof sound dampening batting on the inside of my engine cover is coming apart and needs to be addressed.  Does anyone have a suggestion as to what to buy and where to get it?  Hoping to find the same metalic fire resisitant sound dampening material that is currently there (but falling apart).  Thanks!

Mike

Jackfish Girl, 1999, C36 MKII, Tall Rig, Wing Keel, In-mast furling, Monument Beach, Bourne, MA

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Catboat Willy
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Joined: 12/22/14
Posts: 385

Mike;
Most of the offerings for sound proofing your engine box are usually quite effective, however you should calulate the additional weight it will add to the engine box. The item I looked at added almost 20 lbs. to the weight of the cover. Since I check the oil every day before heading out, I determined that additional weight of the box was more than I was willing to handle. In the end, I used a lighter weight material from these folks.  Take a look at these offerings from Sailors Solutions at; ​
https://www.sailorssolutions.com/?page=Products&SubCategoryID=121&SubCategory=Soundproofing&Category=Engine%20Room

 

Bill Dolan 1990 Catalina C-36 MKI - Hull #1041  'Williwaw'
Std. Rig, Walk Through, Wing Keel
M35, Oberdorfer Conversion,
Home Waters; Charlotte  Harbor & The Gulf Islands of Florida
'You are never out of work if you own a boat'

 

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Chachere
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Joined: 10/27/10
Posts: 825

I added the insulation from Sailors Solutions maybe 3 years ago.  Sealed all the seams with metalic tape, also added foam seals to the box where it joins the floor and the adjacent surfaces.
It helped cut the noise. I did make for a somewhat heavier engine cover, but still manageable.

HOWEVER,  I've found that the adhesive has begun to fail after only a few seasons.   I insulated not only the cover, but the sides and the rear box (where the exhaust riser runs).  The material that I installed over the exhaust riser failed the quickest -- I think the ashesive can't handle some of the higher temperatures.

 

Matthew Chachère
s/v ¡Que Chévere!
(Formerly 1985 C36 MKI #466 tall rig fin keel M25)
2006 Catalina Morgan 440 #30.
Homeported in eastern Long Island, NY

two-rocks
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Joined: 8/11/17
Posts: 74

I put 1.5" material from Defender (used 2 sheets). I attached it with 110 1.5" ss screws with fender washers. I didn't want any adhesive, as it does not last. Cut the noise in half, which means it's still loud - just better.

It was surprising to find the 1/2" material catalina put in was a decent product (lead barrier and all) - just way too thin and only on the front cover itself - I put it averywhere and have a couple more areas to get to. A huge plus was the reduction in cabin heat.

 

TadTV
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Joined: 9/17/16
Posts: 39

I used two pieces of Soundown IVF1010MNSFT12 SOUNDOWN COMPOSITE INSULATION VINYL/FOAM 378-IVF1010MNSFT122.
Each piece is now $76 at Tweetys.com. There was enough to do the inside of the shelf in the aft cabin as well. I used stainless fender washers and #8 or #10 screws- 1" I believe to hold in place. And foil tape for the edges/seams. Works really well- big noticeable difference in the sound from having nothing there before. It does add about 20-30 pounds to the whole box.

Tad Davis
Simpler Times
1989 C-36 MK I #1004
Redondo Beach, Calif.
 

McFly
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Joined: 10/22/18
Posts: 200

Sounds good Tad.  But the more i think about this project, the more I think about how heavy the box will be.  It's important for me to be able to lift the engine cover out by myself.  Adding another 20lbs could be tough.  

Mike

Jackfish Girl, 1999, C36 MKII, Tall Rig, Wing Keel, In-mast furling, Monument Beach, Bourne, MA

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