outboard cowl insulation

Digpig

Cadet
Joined
Jan 28, 2008
Messages
15
Hi all. I have an old Force 85 hp that runs great but has no insulation remaining inside the cowl. Will insulating it make a difference in sound and if so what could be used to insulate it and what thickness ? I have 1" thick spongy / plactic foam (used to protect computers when shipped) not rigid styrafoam. I'm not sure how hot it gets in there.....
Any info would be appreciated
Dave.
 

ddrieck

Senior Chief Petty Officer
Joined
Jul 12, 2007
Messages
666
Re: outboard cowl insulation

Do Not use the foam you are talking about, this is why.

- the outboard may not produce enough heat to melt it but the heat generated form the sun will cause the adhesive to let loose. When it lets loose and the foam falls on top of the flywheel it will look like a thousand mice have chewed up the foam in about ten seconds. This will allow a bunch of it to enter the carbs and choke the engine of air and you will be stranded out on the lake picking out the foam with a couple of screwdrivers and a few tree twigs to get the outboard going again.

Trust me....been there done that.


I ended up getting some dynamate from my local car stereo store to deaden the sound and quite things down. Just be sure to get the dynamate that is made for under car hood installations as it has a strong enough adhesive that will not let go when the sun heats up your cowl. Its not the cheapest stuff in the world but I believe it is better than the manufactures cowl insulation.
 
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