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Old 06-19-2021, 08:01 PM   #1
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Noise and heat reduction on a gas engine A Class

Has anyone installed a noise / heat reducing material under the engine cover inside the cab of your gas engine motor home? Did it make a significant difference? What brand of material did you use?

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Old 06-19-2021, 08:27 PM   #2
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Do a search on "doghouse" and you will find lots of threads on this topic.

David
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Old 06-19-2021, 09:02 PM   #3
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Quote:
Originally Posted by bhill39443 View Post
Has anyone installed a noise / heat reducing material under the engine cover inside the cab of your gas engine motor home? Did it make a significant difference? What brand of material did you use?
Yes
Many people
Makes a big difference
Dynamat is one brand
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Old 06-19-2021, 09:32 PM   #4
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Also…Google it and you’ll find YouTube videos on how-to as well
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Old 06-19-2021, 11:03 PM   #5
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I have no problem with heat or noise from the engine of my gasser.
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Old 06-20-2021, 12:52 AM   #6
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Dynamat in dog house..less heat less noise..

We could not touch the doghouse before this fix
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Old 06-20-2021, 02:11 AM   #7
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Just did this in our class C with legacy 6.8 liter Ford V10. I went a little further than most. I removed the existing foil "hood liner" heat shield, exposing the bare plastic doghouse. I covered the doghouse inside with Kilmat, followed by a layer of Noico foam, followed by reinstall of the foil heat shield.

The Kilmat is to prevent resonant vibration; the Noico foam is to absorb sound waves. The factory foil hood liner is important to reflect heat away from the layers underneath.

Then the icing on the cake - I removed the front seats and floor mat exposing the bare metal cabin floor - then applied the Kilmat/Noico combo on the floor.

The results were astounding... I didn't realize there was so much wind noise until I got rid of the engine/road noise! But the wife is very happy with the noise reduction.
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Old 06-20-2021, 02:32 AM   #8
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I have no problem with heat or noise from the engine of my gasser.
Me neither. The only time the V10 gets a bit noisy is standing on the go peddle.
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Old 06-20-2021, 02:32 AM   #9
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Results...
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Old 06-30-2021, 07:50 PM   #10
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Me neither. The only time the V10 gets a bit noisy is standing on the go peddle.
If you lived in the mountain west you’d make noisy a lot more often when going up and down the mountain passes. On the downs I only stab the brakes to cause a downshift when needed.

I tried the plastic hose fix someone suggested a while back. It didn’t reduce noise but seemed to reduce mileage a bit. Took it off.

Mine isn’t bad anyway but you can hear it as the revs approach 4,000.
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Old 06-30-2021, 07:56 PM   #11
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Just did the Dynamat stuff on our ‘17 Axis 25.3. Did three weeks ago then went out on 2,900 mi trip. WOW what a difference Nice and quiet. Covered the complete cowling, but getting a few of the screws out was a pain as there’s some “wood” in the way. Replaced screws with 1/4 nut drives. You won’t be disappointed-! Ps ordered from Amazon and also got the tape and roller....
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Old 06-30-2021, 08:38 PM   #12
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Cool it and then a layer of DynaMat on the doghouse. And under just about every thing else too.
Additionally the area right front of the doghouse where it is a metal cover, the area under the dash in the hood area, the area about the cat converter, etc. etc. I have about $300 in sound deadening and it sounds quiet now!
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Old 06-30-2021, 09:33 PM   #13
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Just drove 6 hours 70 75 mph dog house warm..before dynamat could not touch after 2 hours
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Old 06-30-2021, 09:39 PM   #14
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In the area "under the hood" what did you use for adhesive to hold the Dynamite in place?
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Old 06-30-2021, 09:40 PM   #15
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Just did the Dynamat stuff on our ‘17 Axis 25.3. Did three weeks ago then went out on 2,900 mi trip. WOW what a difference Nice and quiet. Covered the complete cowling, but getting a few of the screws out was a pain as there’s some “wood” in the way. Replaced screws with 1/4 nut drives. You won’t be disappointed-! Ps ordered from Amazon and also got the tape and roller....
Glad you figured that “hack” out
Once the hex screws are used, it’s ez to access doghouse in future.
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Old 06-30-2021, 09:42 PM   #16
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In the area "under the hood" what did you use for adhesive to hold the Dynamite in place?
What most of us use is the adhesive-backed products that self-stick
Also, HVAC 2”-3” tape helps with seams
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Old 06-30-2021, 11:43 PM   #17
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Originally Posted by salzerj@comcast.net View Post
In the area "under the hood" what did you use for adhesive to hold the Dynamite in place?
Dynamat is self adhesive and is designed to be hung on vertical or overhead surfaces unlike other products.
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Old 07-01-2021, 12:25 AM   #18
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It’s backing is very strong/sticky. The tape is like “aluminum” as well for added strength
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Old 07-01-2021, 01:34 AM   #19
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Class C Ford E450 6.7 V10 Doghouse Heat Shield and Noise Reduction

Try https://www.mkhsupply.com/rv-heat-sh...at-shield.html
Made expressly for this engine and vehicle. Works great.
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Old 07-01-2021, 01:39 AM   #20
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Originally Posted by bhill39443 View Post
Has anyone installed a noise / heat reducing material under the engine cover inside the cab of your gas engine motor home? Did it make a significant difference? What brand of material did you use?
One of the first things I ordered for my 2018 Thor Windsport 29m was a roll of sound/heat insulation. Forget the name, but it was not real thick but highly recommended. I covered the entire inside of the doghouse with almost 3 layers. Why not, what else would I have done with the rest?? Made a huge diff in how hot the it got to the touch and a noticeable reduction of noise too!!! Bob Trice
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