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Cowling inside dampening

Old 10-03-2020, 05:28 PM
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Default Cowling inside dampening

My old 225 2 stroke makes quite a racket. All it has inside is the thin piece of stock foam and thatís over 30 years old and half disinterested. Has anyone ever redone the lining inside a cowling? Thereís a product called kilmat used to dampen road noise in cars. Designed to be put on the floor and door panels. Wondering if this would do a better job or any recommendations of replacement foam? Needs to be flame retardant?

https://www.amazon.com/dp/B0751CBXBT/ref=cm_sw_r_cp_api_i_AOqEFb79G9K0K

Last edited by Tinkertoy250; 10-03-2020 at 05:34 PM.
Old 10-03-2020, 05:32 PM
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Yes, it will help, but how much and will it be worth the effort? I am familiar with Kilmat and other sound deadening materials. The substrate must be cleaned thoroughly and completely free of grease and oil. Perhaps the OEM foam material would be a better choice.
Old 10-03-2020, 05:36 PM
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Originally Posted by Aquasportfisher View Post
Yes, it will help, but how much and will it be worth the effort? I am familiar with Kilmat and other sound deadening materials. The substrate must be cleaned thoroughly and completely free of grease and oil. Perhaps the OEM foam material would be a better choice.
Iíd be willing to redo the foam but not exactly easy to find for a 30 years old motor.
Old 10-03-2020, 05:47 PM
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Might be some information here.

Any tried to insulate outboard cowl?
Old 10-03-2020, 05:53 PM
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Originally Posted by lobsdiver1 View Post
Might be some information here.

Any tried to insulate outboard cowl?
perfect. Seems others have tried kilmat or similar products. The stuff is pretty thin
Old 10-03-2020, 06:03 PM
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Originally Posted by Aquasportfisher View Post
Yes, it will help, but how much and will it be worth the effort? I am familiar with Kilmat and other sound deadening materials. The substrate must be cleaned thoroughly and completely free of grease and oil. Perhaps the OEM foam material would be a better choice.
for 30 bucks Iím willing to take a chance
Old 10-04-2020, 08:23 AM
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I used Dynamat in mine and could hear the difference. Good to get the old foam off anyways,it just makes a mess as it falls apart,
Old 10-04-2020, 08:34 AM
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Originally Posted by muskamoot View Post
I used Dynamat in mine and could hear the difference. Good to get the old foam off anyways,it just makes a mess as it falls apart,
do you recall what style dynamat? They have some that are foil lined like kilmat and some that just looks like foam
Old 10-04-2020, 09:05 AM
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I scraped all of the old foam out of mine because it was starting to crumble. My motor doesn't have an air intake filter (I guess they didn't think the water was a dusty place) and I didn't want chunks of foam getting sucked into the carbs.

I never replaced the foam because I figured 1/4" of foam can't really be doing much. If replacing it makes a difference, I'd be curious to know.
Old 10-04-2020, 03:47 PM
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Originally Posted by Tinkertoy250 View Post
do you recall what style dynamat? They have some that are foil lined like kilmat and some that just looks like foam
I used the foil backed heavy weight stuff for sound deadening cars.
Old 10-04-2020, 03:56 PM
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Originally Posted by muskamoot View Post
I used the foil backed heavy weight stuff for sound deadening cars.
seems like kilmat is basically the same thing actually a bit thicker but definitely cheaper. Iíll let everyone know how it works out if I remember in the spring.
Old 10-06-2020, 03:40 PM
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4 hours later.... added 8 pounds. Iíll report back tomorrow if it made a difference




Old 10-06-2020, 05:20 PM
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That looks incredible. Nice work!
Old 10-06-2020, 05:27 PM
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Originally Posted by frogbite View Post
That looks incredible. Nice work!
thanks. The company recommended a layer of foam to help further but I have to check the clearance. Honestly I think this will make plenty of difference. Weíll see tomorrow. Luckily this is just my backup junk cowling I throw on over the winter. Wanted to test it. If it works Iíll do my good cowling (see below) the same way.

Old 10-06-2020, 08:42 PM
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I used a product called Siless from Amazon basically the same as what you used and it cut the sound enough I can hear my stero
Old 10-06-2020, 08:47 PM
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Originally Posted by bayroamer View Post
I used a product called Siless from Amazon basically the same as what you used and it cut the sound enough I can hear my stero
yup I saw that too. This is Noico. Itís all just butyl rubber on a foil backing. Iíve yet to install a stereo on my old wellcraft so maybe this will finally motivate me to. Something about cutting 5 inch holes in a boat just makes me cringe though.
Old 10-06-2020, 08:48 PM
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I tried Soundown on my old 225 Optis and unfortunately, it did not make a difference. Those motors were very loud!

Old 10-06-2020, 08:55 PM
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I certainly hope this does something based on the amount of goof off I ended up inhaling to get that foam off.
Old 10-06-2020, 09:58 PM
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The stuff they sell at WM did wonders to mine, and trust me when I say it was loud:



Old 10-06-2020, 09:59 PM
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Originally Posted by Flying_Norseman View Post
The stuff they sell at WM did wonders to mine, and trust me when I say it was loud:


happen to remember what it was called?
edit: found it

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