soundproofing

[captquest]

What is the best material to replace the foam sound proofing in the engine cover, and where can I get it? My old stuff is detoriating and I'm afraid it might get in the carbs. BTW my freshly rebuilt 1998 120 is running like a new motor, I even changed the graphics.

 

[chitownborn]

Re: soundproofing

This is how I did mine, and all this stuff can be bought at home depot. One can of spray adhesive, some quarter inch styro foam, foil type tape and of course duct tape. Cut the styro foam to fit all sides and the top of the cowl. once this is done spray the snot out of the inside of the cowl and put the styro foam in place, let dry for awhile, then in the corners use the foil tape and then cover the entire inside with the duct tape, make sure you get all those little styro balls outta there. After doing it this way i can barely hear the old force run, i did this two years ago and i dont have a problem with any thing falling off. i check it pretty regular to make sure good luck Don

 

[RRitt]

Re: soundproofing

i did same thing as above except instead of styro-foam i bought some very thick neoprene rubber off ebay. One side is waterproof foam and the other is metal foil. Neoprene usually isn't considered an oil-proof material so I glued it in foil side out.

My boat is a center console fishing boat with dual 85. You could not talk while on plane due to engine noise. After putting in foam it became possible to hear radio and talk while cruising.

 

[crazyinkc]

Re: soundproofing

I was thinking of trying some roll on bed liner for my 88 50hp. My foam was all over the place when I bought my toon. The carb was covered it old foam bits and I know the motor had a foam supplement diet for a while. The old girl still runs like a champ.

 

[Matthew A.]

Re: soundproofing

I am very happy with the results I got using spray on expanding insulating foam. The type sold at Home Depot. Not only is it extremely effective at deadening the sound, it was also very easy to apply and to shape using just my hands. Since the foam forms a skin almost immediately after being sprayed, you can use light pressure using the palm of your hand to shape it. Which also helps to make the foam more dense. The more dense the material, the better job at sound absorbtion. Once cured, I then I applied several spray-on coats of rubber based under coating used for sound deadening in cars. One note of caution. If you decide to use styrofoam board, be careful since it has a tendency to break up into small round beads. I don't know if they could do any damage, however, due to their light weight they can easily get sucked into the carbs.