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Old 11-19-2015, 03:43 PM   #1
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Operation- "Silent Doghouse"

My next hobby project for my 99 Southwind is to try to quiet down my engine compartment.

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There isn't much documented feedback on sound deadening options in RV's so I figured I'd take a swing at it.

I have spent about $300 on more dynamat than I care to count and have quite literally coated my entire engine bay and inside of the doghouse, with little relief from my "screaming V10 Triton" on hills. It has helped a very small amount but definitely not $300 worth. Admittedly it has cooled down the doghouse so my feet aren't melting! ☃


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My next step which I heard may help, is to place a yoga mat underneath the recently installed "raised vinyl plank" flooring all around the engine bay.

I read somewhere that a yoga mat may help due to its construction. I'm going to go one step further and use a thicker style foam garage floor mat which I bought from Costco, but haven't used. It's the same construction as a yoga mat... only thicker.

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I plan to put this under the vinyl flooring, and up against the inner fire wall (dynamat is on the outer wall). I need to replace the raggedy carpet over the doghouse, so I "may" put the foam over top of the stripped doghouse before covering with new carpet (hmm).

I have used a decibel meter while driving and measured before and after the dynamat, with an average reading of 80 decibels. Curious to see if the added yoga mat helps?

Stay tuned! 😬
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Old 11-19-2015, 03:51 PM   #2
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It should help, just like adding the sound deadener (dynamat) helped some. Be interesting to see actual number results.

I did the sound deadener in the cab floor and firewall, and also doghouse on my old Super-C; which made a big difference. No actual number results, but it certainly made it better. My issue was noise more than heat, but the sound deadener does have some insulating value. Never did get around to putting it on the doors for additional help before I traded it off.
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Old 11-20-2015, 08:31 AM   #3
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On my last two gassers I used foam carpet padding glued to to the underside, then put the aluminum covered bubble wrap insulation from Lowes/HD over the padding. Conversions then were tolerable and cost was near nill.
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Old 11-20-2015, 05:30 PM   #4
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This is what i used and attached with 3M contact spray glue. Then used Aluminum duct tape to seal the edges and any cuts i had to do. 3 years and looks like I just did it.
14130 Thermo Tec Thermo Guard Fr Heat Shield | eBay
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Old 11-20-2015, 06:03 PM   #5
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If your doghouse is not fitting precisely even a tiny gap will eliminate all of the efforts you have made. Use a strong light on a dark night to find gaps. Place the light on either side and check for any light. I covered three doghouses on rv's and the reduction was excellent.
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Old 11-20-2015, 07:39 PM   #6
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Quote:
Originally Posted by YC1 View Post
If your doghouse is not fitting precisely even a tiny gap will eliminate all of the efforts you have made.
I can second this, I have a brand new Winnebago Vista, seemed kinda loud noticed the dog house didn't fit tight against vinyl floor on drivers side. Could put my finger up under it and feel more heat there. Tried different things to make it sit more flush but wouldn't. So instead I got some 3/4" foam weather strip and put it under the rubber gasket that is attached to metal lip of floor opening the dog house seals against.

This made a noticeable improvement in noise and heat by making a tighter fit for the existing rubber gasket.
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Old 11-26-2015, 10:35 AM   #7
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I put some relatively inexpensive foil over fiber insulation under the doghouse area for a fair but not great improvemet. I then spent a fair amount of time crawling under the rig looking for and repairing the sources of the noise. I found several loose sheet metal heat guards and splash shields that were making noise. There was a broken weld on one end of a heat shield and some other panels with loose or missing screws. I also found a couple of panels that were installed loosely at the factory. (screws along one edge only and floppy loose on the opposite edge) Fixing rattles made the final result a big improvement for not so much money.
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Old 05-21-2016, 06:11 PM   #8
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Sound Control Update:

So I installed Dynamat quite literally everywhere in the front engine compartment (under hood) and under the inside doghouse top & sides.

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To be honest I only noticed great improvement in "heat transfer" in the floors. My feet are now cool (lol).

I had heard that yoga mat type material may have qualities that will dampen the sound transfer as well. Well yesterday I installed the Costco interlocking floor mats which are twice as thick as standard yoga mats. I glued it against the inside firewall (opposite Dynamat on engine side), as well as under the vinyl interlocking flooring on the drivers side (can't get to passenger side yet). I also cut pieces and glued under the carpet around the outside of the doghouse.


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If this doesn't work, well I give up lol. I may take the inside drivers door skin off and glue some mat there too!

I'll update you all after my trip next week!

TOTAL COST(s):
Dynamat - $270
Costco yoga/garage mat - $20

We will "shadetree mechanic" figure this out! Lol 😉
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Old 05-21-2016, 07:39 PM   #9
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Just finished adding the foam yoga mat to the inside door skin.

I had to glue it to the inside of the plastic portion as opposed to the actual metal door in order to avoid interfering with the mechanism.
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As you can see, there was literally "zero" sound insulation within the door itself!
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Old 05-22-2016, 08:52 PM   #10
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Thanks for the pics. Keep us posted.

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Old 05-23-2016, 02:11 AM   #11
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Great article:

http://www.fullsizechevy.com/forum/g...l-results.html


Name: Jason
(99 Fleetwood Southwind 32v)
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