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  #11  
Old 03-24-2012
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Re: Acoustic Insulation for engine room?

I used some 1" Insulmat under my engine floor boards (haven't finished the engine compartment yet), but to tell you the truth I don't notice a real difference in sound deadening.
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Old 03-25-2012
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Re: Acoustic Insulation for engine room?

Quote:
Originally Posted by SloopJonB View Post
Flyby, Is that lead foil in the middle between TWO layers of foam? Can you make this up yourself in the engine room or does it have to be pre-manufactured sheet goods?

I purchased the sheet already laminated in a sandwich construction.
It was so long ago ~30 years, that I can't possibly remember the source.
If you were to do the lamination your self, then I would suggest a solvent based psa adhesive (Ashland Chemical Co.), failing that, a water based psa woukd probably work based on the mfgrs recommendation.
I can not over emphasize the need for a PRESSURE SENSITIVE adhesive.
Foil is easily available on line.
Hope thia helps.
Dick
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Old 03-25-2012
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Re: Acoustic Insulation for engine room?

I used to do a lot of audio recording, and while I never got too far into sound treatment, I was always told that the thing that stops sound is mass. I'm not surprised that some of the other people in this thread had the best luck with lead. A lot of music studios and things use soft sound treatments, like foam, fluffy fiberglass or rigid compressed fiberglass panels, but they're doing that more to "tune" the room by lessening echo and preventing the buildup of certain frequencies when instruments are being played and recorded in there, not to sound-proof the room. Although every little bit helps, going with something less dense will likely block proportionately less sound. At least theoretically.
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Old 03-25-2012
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Acoustic Insulation for engine room?

Recent episode of Holmes on Homes emphasized the need for a dead air space between sound absorbing sheets. They got 50dB of attenuation that way, especially effective for lower frequencies (like engine noise).
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Old 03-26-2012
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Re: Acoustic Insulation for engine room?

Anyone try that coating they use on the wheel wells of cars to reduce road noise?
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Old 03-26-2012
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Re: Acoustic Insulation for engine room?

A friend in a sound lab, told me that when using lead on foam, the foam makes no difference whatever. It's the lead doing the sound deadening.
Carpet is just as effective as fibreglass, just a lot tougher, and easier to deal with.
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Old 03-26-2012
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Re: Acoustic Insulation for engine room?

Quote:
Originally Posted by Brent Swain View Post
A friend in a sound lab, told me that when using lead on foam, the foam makes no difference whatever. It's the lead doing the sound deadening.
Carpet is just as effective as fibreglass, just a lot tougher, and easier to deal with.
Yes, I agree.
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Old 03-28-2013
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Re: Acoustic Insulation for engine room?

Acoustic Insulation sounds great but it is expensive. I am thinking of a free solution for me.I have a lot 1" closed cell foam sheets (4x8)lying around and was thinking about lineing my engine compartment with this (this is fire resistant CSA compliant insulating material.) I know it probably won't work as well but would it help reduce the noise coming out of my engine room. The motor (yanmar ysm 12)is out right now for a rebuild so I could line the whole area and it won't cost anything but a little time.
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Old 03-28-2013
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Re: Acoustic Insulation for engine room?

Quote:
Originally Posted by lajimo View Post
Recent episode of Holmes on Homes emphasized the need for a dead air space between sound absorbing sheets. They got 50dB of attenuation that way, especially effective for lower frequencies (like engine noise).
Quote:
Originally Posted by Brent Swain View Post
A friend in a sound lab, told me that when using lead on foam, the foam makes no difference whatever. It's the lead doing the sound deadening.
Carpet is just as effective as fibreglass, just a lot tougher, and easier to deal with.
I think the foam acts as an air space, so it in it's self does not stop much sound, but it creates an airspace.

By the way Dynamat is really just asphalt, so there are adhesive roofing materials that work the same, again really just the mass of the heavy coating. The stuff does smell pretty bad though. I have used it successfully in car installations.
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Old 03-28-2013
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Re: Acoustic Insulation for engine room?

Vacuum passes neither heat nor sound.
On the other hand you can not find it in convenient easy to install panels unless you work for NASA or some other organization that doesn't have to count (pinch) pennies.

Until then us common folk are best off with one of few solutions, add mass (lead) to absorb the sound or add vibration dampening to lessen the noise and of course to add baffling - i.e. foam or sound reflective surfaces (the paint on stuff, and perhaps carpet).

If you "really" want to insulate for sound - get a roll of sheet lead and apply your own lead sheet (use a PSA) to your existing walls - after all lead is soft and bendable and cuts easy.
Lead Sheet from Rotometals

Don't make your engine compartment so well 'sound' sealed that it starves for air.

Of course racer's hate mass, but how many of them care how loud the engine is?
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