| Keeping the noise down [message #365623] |
Thu, 22 July 2021 10:40  |
boybach
Messages: 566
Registered: December 2020
Location: Vancouver Island
Karma: 4
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Senior Member |
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I've just added a bunch of insulation to the cockpit floor and firewall. I used 1/4" cork sheeting first (cos I had about 100sq ft of it in the garage) followed by some Amazon sticky foam stuff. Together, they effectively raised the floor level up about 3/4".
I'm sure there are fancier/pricier and no doubt "better" ways to do it, but what I did will definitely cut down on engine noise enough for my needs.
So I started thinking about the "other" engine compartment - the Onan.
Back of my coach retains the original Palm Beach arrangement, rear dinette with fold down beds. The Onan's house is under the driver's side seat and the "roof" is plain, un-insulated fiberglass. Seems to me I could shut that sucker up quite a bit adding some sound deadening material to the fiberglass areas under the driver's side bed and possibly behind the wall too.
Anyone done this? Good results?
Larry
Larry - Victoria BC -
1977 ex-Palm Beach "Ol' Leaky" 40,000 miles, PO said everything working but forgot the word NOT. Atwood helium fridge, water heater & furnace. SS exhaust system, Onan, Iota Converter, R134A, New fuel lines & heat exchange hoses
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| [GMCnet] Re: Keeping the noise down [message #365631 is a reply to message #365630] |
Thu, 22 July 2021 23:01  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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I used closed cell foam and covered that with a sound deadening foil backed
material that felt a lot like lead. It is made for hot rods to deaden
sounds from exhaust systems, etc. It is heavy but really effective. It
quieted that Onan down a lot. Can't remember the trade name. Summit has it,
as well as other suppliers.
Jim Hupy
Salem, Oregon
On Thu, Jul 22, 2021, 8:16 PM Carl Stouffer wrote:
> I lined my Onan compartment with some material I got from Jim Bounds. It
> is Mylar faced with two layers of foam with a sound barrier between them.
> It is glued to the inside of the compartment and screwed in a kind of
> quilt pattern with self tappers and fender washers.
>
> It did improve the sound level inside the coach.
> --
> Carl Stouffer
> '75 ex Palm Beach
> Tucson, AZ.
> Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive,
> Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American
> Eagles,
> Solar battery charging. GMCSJ and GMCMI member
> _______________________________________________
> GMCnet mailing list
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| [GMCnet] Re: Keeping the noise down [message #365637 is a reply to message #365634] |
Fri, 23 July 2021 09:30 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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I used a sandwich layered foam/high density rubber material from a company
called soundown. They do marine acoustic materials. Since my onan box was
galvanized steel sheet metal and little else I removed it and made a wooden
box out of 1/2” plywood with 2”x2” boards cut in half length wise to create
triangular reinforcements of the sheets. Soundown had a foil faced material
which was screwed to the inside of the box.
If you do not have room inside the box the material could also be place on
the outside.
Sully
Bellevue wa
On Fri, Jul 23, 2021 at 6:51 AM Matt Colie wrote:
> We have a BF (4kW) in a 23 and things are different.
>
> I wanted to line the Onan box with some loaded foam that I had, but there
> was not room over the top of the unit for it to be there and not be
> interfering with things. I dropped that plan.
>
> Matt
> --
> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL,
> GMCES
> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum
> Brakes with Applied Control Arms
> SE Michigan - Near DTW - Twixt A2 and Detroit
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: Keeping the noise down [message #365641 is a reply to message #365623] |
Fri, 23 July 2021 12:00 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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My 77 compartment has factory glued in foam lining. Assuming it is fire retardant as dangerously close to exhaust manifold. It is charred from heat. Check the fire rating of anything you add.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Keeping the noise down [message #365645 is a reply to message #365623] |
Fri, 23 July 2021 17:05 |
boybach
Messages: 566
Registered: December 2020
Location: Vancouver Island
Karma: 4
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Senior Member |
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I'm planning on doing everything from inside the coach.
The fold down bed can be raised to get access to the top of the Onan's fibreglass "box" and the back of the box cam be accessed by removing the trim below the fold down bed. I didn't fancy getting inside the Genny drawer and trying to clean it up enough to get some insulation to adhere.
I won't be able to get quite as much covered up but some will definitely help I would think.
Larry
Larry - Victoria BC -
1977 ex-Palm Beach "Ol' Leaky" 40,000 miles, PO said everything working but forgot the word NOT. Atwood helium fridge, water heater & furnace. SS exhaust system, Onan, Iota Converter, R134A, New fuel lines & heat exchange hoses
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| Re: Keeping the noise down [message #365686 is a reply to message #365641] |
Mon, 26 July 2021 15:55 |
boybach
Messages: 566
Registered: December 2020
Location: Vancouver Island
Karma: 4
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Senior Member |
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My onan compartment is also insulated like yours but I added the cork layer plus improvised with jigsaw 3/8" foam flooring cut to size under the fold out bed and between the closet and the side of the Onan house. I still could do the gangway front, which would be the back of the power drawer but testing it right now, those panels o just covered have already quietened down the Genset considerably
If I get over a temporary attack of the lazies, I might to the front but for now, not bad at all.
Larry
Larry - Victoria BC -
1977 ex-Palm Beach "Ol' Leaky" 40,000 miles, PO said everything working but forgot the word NOT. Atwood helium fridge, water heater & furnace. SS exhaust system, Onan, Iota Converter, R134A, New fuel lines & heat exchange hoses
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