I have used spray foam, as that is what I have readily available to me. I have seen mat used with great success as well. The mat deafens both the high and low frequency sound waves, by combining a foam and a mat together. Usually more expensive though.
For a number of years OMC quit using foam in their cowls for the very reason you see in yours. Scrape/sand the loose particles out and run it that way.
I completely removed mine I sand it clean and paint it. You don't want any loose dust or particles airborne under the cowling, it ends up in the carbs and clogs your jet ...
i was thinking of the sort of sound deadening you can put in cars, if thats adequate. for those of you that left it bare, is there a noticable increase in noise or is it marginal?
i was thinking of the sort of sound deadening you can put in cars, if thats adequate. for those of you that left it bare, is there a noticable increase in noise or is it marginal?
Like the others have suggested, remove the old foam and leave it clean. Did the same thing to mine, and I cannot tell any difference in the sound level.
I also removed mine and can't tell a difference in noise. I also have had bad experience with the car sound deadening stuff in the past - the kind I used turned to a gummy mess in the heat and didn't seem to help with noise either.
I did not notice any difference in sound also. There were questions of the heat transferring to the decals sent to me a while back. My Decals is still in awesome shape with no peeling to report.
