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  #21  
Old 11-13-2013
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Re: Best way to soundproof engine compartment?

Quote:
Originally Posted by Dave_E View Post
There are 2 kinds of marine engine compartment insulations. One is for gas, the other for desiel. I just redid my doghouse... it's not that hard. Good sturdy putty knife took off the old stuff. Sanded down the old glue spots with big grit paper. Use spray glue in a can MADE FOR FOAM. Found a can at my local hardware store. The new insulation (as mentioned) is pricey. Don't skimp if you can, you'll be glad you didn't. Cuts with a good heavy pair of scissors (might have to borrow your neighbor's jocko kid though) :-)

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Spray glue is used in conjunction with a fastening system supplied with the foam. The glue by itself will not hold the weight long term.
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  #22  
Old 11-13-2013
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Re: Best way to soundproof engine compartment?

3M makes two "strengths" of foam spray adhesive, the stronger (90?) holds up the heavy 1.5" foam with the barrier in it for about a year and a half on the overhead sections (much longer on the vertical areas). This is in a powerboat that sees a lot of rough water. We bought our sound proofing stuff from Hamilton Marine here in WA, very similar to the stuff that Mitiempo sells in BC.
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Old 11-13-2013
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Re: Best way to soundproof engine compartment?

The original foam insulation from 34 years is what I took off. It was glued on. If you find glue that can be brushed on for foam... Go for it. You don't need to coat the whole thing.
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  #24  
Old 11-14-2013
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Re: Best way to soundproof engine compartment?

If it is just foam it will last for years with only glue holding it on. Soundown is heavy because it has the mass vinyl layer in the middle - this is what quiets the deeper sound of a diesel. Lead was used for this in the past. The additional fastenings I posted earlier are not hard to install and do a good job.
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Old 11-14-2013
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Re: Best way to soundproof engine compartment?

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Originally Posted by hellosailor View Post
The lead/vinyl absorbs energy just because it is so dense. The foam decouples that vibration from the engine compartment walls, and in theory you get less noise.
The lead/vinyl for the most part doesn't absorb the energy. Its purpose is to create a density change which reflects sound back into the engine compartment. Both density transitions (air to lead/vinyl, and lead/vinyl to foam) reflect sound. The foam also creates a third density change (foam to fiberglass) which causes an additional reflection. The foam does absorb energy as you explain, but its primary purpose is to create additional density changes and thus additional reflections. Each reflection means less sound that's leaking out of the compartment.
Reflection and Transmission

This is also the reason that certain fish without swim bladders (e.g. tuna) don't show up well on fishfinders. Muscle is almost the same density as water, so without much of a density change there isn't much echo for the sonar to pick up. A swim bladder OTOH (muscle to air to muscle) creates a big echo.
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Old 11-14-2013
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Re: Best way to soundproof engine compartment?

Best way to soundproof engine compartment = sail more!
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Old 11-14-2013
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Re: Best way to soundproof engine compartment?

Before you buy do some web searches on sound deadening. There's lots of info on sound transmission for the guys building 1000 watt stereos in their cars. The auto sound deadeners aren't cheap, but they are usually less expensive than marine stuff. I am in line for replacing mine also, so I've been looking.
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Old 11-14-2013
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Re: Best way to soundproof engine compartment?

Remember it should be fireproof.
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