| Author |
Message |
estergater (171.75.22.52)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 09, 2003 - 1:28 am: | |
We have put 1/2" plywood on the floor and on the back wall of our MCI-9. On top of that we put 1" rigid foam with foil on both sides. On the floor, on top of all of that, we put 3/8" plywood going one direction and 1/2" plywood going the other direction on top of the 3/8" plywood (yes, I made a trap door for the two access hatches) The floor is fine. The rear wall I didn't put the 1/2" over the 3/8" plywood. and it still gets hot. Too hot, like a heater in that room. Do I need to put the 1/2" plywood over that too, or does anyone have any other suggestions?
Thank you, again!!! |
Don KS/TX (66.82.9.37)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 09, 2003 - 6:53 am: | |
I can only give you sympathy. Guidance to anyone working on that area, I was amazed also after insulation and sealing the rear, how much noise and heat STILL got in there. I used 2 inches of foam, did pretty well on the heat, but a ride back there when at cruise was still too noisy. My recommendation is to add more than you think you will need! |
Gary McFarland (Gearheadgary) (209.128.99.4)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 09, 2003 - 11:46 am: | |
We have identified this as a problem for us as well. I'm going to use Marine Engine Room Insulation.
I't a foil-backed foam with a layer of, I think, lead-impregnated rubber. It's very heavy, and very expensive.
Also--I'm going to "Header Wrap" my turbo discharge pipe all the way out of the engine compartment.
One last thing, I'm planning on a fairly high-cfm engine-room blower to evacuate the compartment.
That's my plan anyway.
Gary |
John Feld (204.184.224.26)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, October 09, 2003 - 12:20 pm: | |
Just my opinion here.
Sound and heat have two things in common, they have to have somewhere to go. Look at heat shields, such as heat deflector shields for the starter on some cars, exhaust manifold, etc. you will notice they only create a barrier and are open. A good sound barrier is just a maze of angles to prevent reverbaration and capture the sound.
Place hard surface to hard surface and you create a conduit for the transmission of sound and heat from one side to the other. The plywood and foam become a heatsink that will store the heat untile full, then pass it on furthur.
What I plan to do where the engine compartment meets the bedroom is use a loose barrier of fiberglass with small vent holes to the outside skin, overlay a two-sided wraped foam sheet, a second air space (say 1/16 inch), then my 3/4 ply bulkhead followed by carpeting on the rear wall. The ceiling in the beadroom will also be carpeted to increase sound absorbtion.
Too much sealing can have the reverse effect, plan airspace and port the air space to channel the sound and heat.
My2cents,
John 4104 |
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