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I finally got out on the water this weekend - we had a great time and the old Evinrude ran perfectly. But, I was reminded that it definitely wants everyone to know that it is in the room! ;-)
So, I've been poking around looking for ways to quiet an old outboard down a bit, and I came across Silent Running Paint. Has anyone here tried it on their engine cowl? If so, how did it perform? Was the heat rise noticeable? What's your experience with this stuff? It sounds like a good place to start.
Cool boat! Does your engine still have the sound deadening foam rubber inside the cowl? Mine was removed by mice over the years and when I finally replaced it I was amazed at how much quieter it was. I have the same engine as you. You can still purchase the OEM pre-cut foam for those engines. Perhaps a layer of that paint and some new foam would be the cats meow. The paint absorbs vibration while the foam rubber absorbs sound. I would not worry about the heat generated from the paint, their website says the temp increase is measured in ten thousandths of a degree!
The viscoelastic properties of Silent Running liquid-based coatings absorbs the noise and vibration and converts it into low-grade heat, which is dissipated throughout the applied surface.
Thanks for all the feedback. It looks like I will get up to the boat this weekend, so I can pop the cover and check on the condition/existence of the foam insulation. I will measure the thing too. If I can get away with just a quart of the paint, I might try it. Otherwise, it seems too spend, and I will replace the insulation instead.
