air filter/noise deadener

[woodnknots]

My 1990 Force 90 o/b has a bunch of the foam on the inside of the cover coming off/missing. What can I use to replace it, and where can I get it?
I noticed the motor sounded alot louder, and then when I pulled off the cover, I lost a nice hunk of the foam. Any help is certainly appreciated!

 

[baxtr]

Re: air filter/noise deadener

I had same issue, get it all out of there so you don't get any sucked into the carbs. I just left mine off, yeah a bit louder, but it is an outboard.

I did do a search for outboard hood insul, and came across quite a few threads with people saying to use 3/8 carpet pad attached with contact cement. Not sure what fire or heat rating that stuff has, but I am sure you could find out. Also came across one saying to use expandable foam. not sure about that one, a bit too hard to control the expansion, and once again I don't know the fire characteristics it.

 

[4runneradam]

Re: air filter/noise deadener

How about dynamat or similar car stereo insulation material?

 

[Matthew A.]

Re: air filter/noise deadener

I went to Home Depot and purchased one half of 3/4" x 4' x 8' sheet of insulation board. I can't recall it's exact name but it is found in the building material section along with styrofoam sheet and is similar to the 4' x8' styrofoam board except the foam is yellowish/orange in color, and is finer grained then styrofoam. The foam is the same stuff found in freezers and juccuzi's. . The insulation is quite dense yet very light weight and provides excellent sound proofing compared to OEM foam rubber padding, carpeting, styrofoam. It also comes with a durable aluminum foil backing on both sides. The foam insulation due to it's make up and the aluminum backing gives it good resistance to chemicals and it is also fire resistant. Also, the aluminum backing also helps to suspress micorwave interference/RFI created by CDI ignitions. I chose to use a spray on adhesive such as 3M brand to hold it in place.
As for an air filter....not a bad idea on any motor. However, be prepared to make some changes to the carburators air/fuel mixture settings as well as changing main jet size due to the air filter restricting the air flow. I opted for doubling up some stainless steel window screen and folding it upon itself much like a hand held folding fan, several times then attached it with several screws to the air intaky thingy magigiy.

I hope I was at least somewhat understandable.

 

[woodnknots]

Re: air filter/noise deadener

doesn't the foam also act as an air filter? That was my understanding. That's the only reason I'd be hesitant to use the insulation board mentioned above. I may be wrong, but that's why I post here, to find out!!

 

[Matthew A.]

Re: air filter/noise deadener

Depending on the model engine and it's cowling, some have opening near the top and rear of the cowling. However, if you take a look the motor pan on many outboards you'll find vent holes used for fresh air intake located on the underside near the front.