Sound deading material.

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Mr. Asa
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Location: Tampa-ish

Re: Sound deading material.

Postby Mr. Asa » Wed Sep 12, 2018 7:22 am

SteveH wrote:Somewhere I read about a guy who put a plastic bag over the power head, put the cowling back on and used spray-in foam...

Sounds like a good recipe for a fire later on.
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SquierKA39
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Re: Sound deading material.

Postby SquierKA39 » Wed Sep 12, 2018 8:57 am

Mr. Asa wrote:
SteveH wrote:Somewhere I read about a guy who put a plastic bag over the power head, put the cowling back on and used spray-in foam...

Sounds like a good recipe for a fire later on.


That was a good friend of mine, Art Seselberg, who did that. It was on an OMC 20 horse from late sixties I think. He told me it worked great, and no fires. Of course after the foam set up he had to carve some of it away so the cover fit and had some air flow around the powerhead.

amuller
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Re: Sound deading material.

Postby amuller » Wed Sep 12, 2018 11:21 am

Is flotation an element of the picture? Is the foam in the OMC fiberglass hoods enough to keep a dropped one on the surface?

Alan

amuller
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Re: Sound deading material.

Postby amuller » Wed Sep 12, 2018 11:24 am

Other question: OMC went from using basically open metal covers and inlet silencers, to sealed fiberglass hoods used as intake plenums. Are these "tuned," such that missing foam, or extra foam, effects the output?

am

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Garry in Tampa
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Re: Sound deading material.

Postby Garry in Tampa » Wed Sep 12, 2018 4:33 pm

Foam only harms output when it blocks the air intake . . . :D
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Chris_P
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Re: Sound deading material.

Postby Chris_P » Wed Sep 12, 2018 5:07 pm

Don't use spray foam. It will clog up your jets continuously. Stick with a non friable material, such as the vinyl septum or closed cell rubber mentioned.

aquasonic
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Re: Sound deading material.

Postby aquasonic » Thu Sep 13, 2018 4:31 pm

In 2013 I added 1/2" thick Soundcoat acoustic insulation to my 1990 Evinrude 15. The original insulation had crumbled, so there wasn't much to make a pattern from other than the cowl itself. Four panels did the trick. The adhesive is so powerful that you only have one chance to position it. So far, it has worked well.

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Soundcoat Insulation
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chris
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Re: Sound deading material.

Postby chris » Thu Sep 13, 2018 5:01 pm

aquasonic wrote:[size=150]So far, it has worked well.




That's all I needed to hear. Ordered. :D
1955 10hp, 25hp, 1957 18hp Johnsons. 1958 35hp, 1972 50hp Evinrudes. Among others...


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