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Old 11-13-2017, 03:26 PM   #21
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Model: '17 Axis 24.1
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Quote:
Originally Posted by Mel556180 View Post
SuperD, I’ve read the Dynamat damps down vibrations coming through the housing, while the hoodliner insulates to block heat and sound.
So it would seem best to apply the dynamat directly to the housing inside, then cover with the hoodliner.

Am I missing something here?
I contacted Dynamat before installing Xtreme & Hoodliner and here's the response I received. I followed their instructions and it made a big difference in noise & heat reduction in our Axis.

"Thank you for your interest in our products.

We recommend two products for the engine cover on your class A motorhome:
Xtreme and Hoodliner.

First, install the Xtreme. This product will damp any vibrations/resonations in steel, fiberglass, or wood panels to reduce structure borne noise.

Over the Xtreme, install our Hoodliner. Hoodliner is the 3/4 inch thick, peel and stick material you mentioned. Hoodliner used with the Xtreme will do a good job to reduce engine noise and heat."
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Old 11-13-2017, 05:15 PM   #22
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Sound also comes through any gaps. Anyone try to seal the edges better?
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Old 11-13-2017, 05:21 PM   #23
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Originally Posted by TexAxis View Post
I contacted Dynamat before installing Xtreme & Hoodliner and here's the response I received. I followed their instructions and it made a big difference in noise & heat reduction in our Axis.

"Thank you for your interest in our products.

We recommend two products for the engine cover on your class A motorhome:
Xtreme and Hoodliner.

First, install the Xtreme. This product will damp any vibrations/resonations in steel, fiberglass, or wood panels to reduce structure borne noise.

Over the Xtreme, install our Hoodliner. Hoodliner is the 3/4 inch thick, peel and stick material you mentioned. Hoodliner used with the Xtreme will do a good job to reduce engine noise and heat."
Guess I got it backwards, good thing is it still works well!
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Old 11-13-2017, 05:43 PM   #24
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[QUOTE=SuperD;97199]I used the Hoodliner and Extreme both, as recommended by DynaMat. First layer was the Hoodliner with seams sealed by DynaMat tape, then Extreme, again sealed with tape. Big reduction in noise, NO heat at all from the doghouse now. DynaMat is a little more expensive but you get what you pay for! Would do it again.

I'm convinced that adding the DynaMat to the engine cover is a good winter project and plan on doing as SuperD did (except get the DynaMat and Hood Liner down in the right order). I don't see much up side to trying something cheaper. In my experience, whenever I try and do something like this on the cheap, I end up doing it twice. Looks like about $250 for materials.

I'll look at doing the floor under the driver and passenger and as maybe a spring project (depending upon when spring actually comes - we get it late at altitude). I've seen posts on putting the DynaMat on the underside, but it looks like a fair job to get it installed around all of the other stuff that's down there. I'll probably see how the engine cover works first.
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Old 12-14-2017, 05:24 PM   #25
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I finished my sound deadening project last week. I went the Dynamat route as it is a job I only want to do once. I used the same materials that SuperD used, but did get the Dynamat under the hood liner.

I found the same thing he did with the OEM liner - very poor quality and lots of gaps. They tried to use aluminum tape to cover some of the gaps, but when I pulled the doghouse, most of the tape was loose. I filled in the gaps with some of the hood liner material and put the Dynamat over the OEM liner. Then the hood liner when over the Dynamat. I used Dynamat tape on the Dynamat layer seams, but used HVAC aluminum tape on the hood liner layer. I also put a layer of Dynamat under the cup holder tray.

The doghouse cover took 3 sheets of Dynamat, so I have enough Dynamat to put it under the driver's and passenger side floor this spring.I won't know how much improvement it makes until springtime when I will take the coach out again. DW is having knee replacement surgery next Monday, so she will be on the sidelines for a couple of months.

While I was moving the doghouse cover around, one of the cheapo drink holder covers popped off and has disappeared for the time being. its one of those things that won't show up until you stop looking for it. I might have to contact Thor to get another cover. Maybe I'll get lucky and find one on eBay. Hate to spend money on such a cheap, non-functional thing though. The covers are always popping off.
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Old 12-14-2017, 06:18 PM   #26
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I am sure it helps with heat but what about sound?
Absolutely helped with engine noise. I downloaded a decibel meter app on my phone and measured at 2,000rpm engine rev before and after. Decreased 5-10 db. Down to the level that I can have a normal conversation with my navigator while on highway. Dog house, above/around engine housing, and under hood/dash area all for $40.00. I'm a happy camper.
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Old 12-14-2017, 10:22 PM   #27
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When I did the Dynamat thing I was surprised to see that there was absolutely NO insulation of any kind under my dog house cover. Nothing but raw fiberglass.
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Old 12-14-2017, 10:27 PM   #28
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After I finish mine I also had some leftover and did underneath the driver and passenger floor where your feet are because of my feet were always really hot from the heat of the motor it's stuck really well above the front tires on the outside of the floorboard then finished sprayed over it with a can of that waterproof sealer rubberize coating.
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Old 12-14-2017, 11:02 PM   #29
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I finished my sound deadening project last week.


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Old 12-14-2017, 11:05 PM   #30
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When I did the Dynamat thing I was surprised to see that there was absolutely NO insulation of any kind under my dog house cover. Nothing but raw fiberglass.
Thatís a factory screwup. I have pulled two doghouses from my Vegas and Axis and both had at least some insulation. Many other Vegas and Axis owners in this forum have also added insulation to their doghouses ove4 the past four years or so and to my recollection no one has reported no insulation in their doghouse.
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Old 12-15-2017, 12:14 AM   #31
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I left the cup holder tray off completely, used a piece of rubber tool box tray liner, cut to fit area and held down with pieces of double stick carpet tape. I don’t miss the doghouse cup holders at all since I never used them, like having a nice big tray now.
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Old 12-15-2017, 12:47 PM   #32
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Yeah, I'm usually the "lucky" one.
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Old 01-21-2018, 02:41 AM   #33
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Today I installed the Dynamat extreme (Actually the Noico equivalent) on my vegas doghouse and then Hoodliner on to that (as per dynamat website). A great improvement in sound and no discernable heat on doghouse. I may use the left overs under the dash if I can get to it. I can now carry on a conversation while going uphill This mod is 2nd best only behind Safe-T-Plus .
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Old 01-21-2018, 04:53 AM   #34
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I did the same on my Axis. There was enough Hoodliner material left to cover the metal engine cover as far as I could reach. The exposed metal at my gas pedal is no longer too hot to touch. At the price we pay, sound and thermal insulation should be standard not a DIY mod.
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Old 01-21-2018, 12:24 PM   #35
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At the price we pay, sound and thermal insulation should be standard not a DIY mod.
I sure agree with you. And vent covers. And steering control, etc!
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Old 01-21-2018, 03:06 PM   #36
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After I finish mine I also had some leftover and did underneath the driver and passenger floor where your feet are because of my feet were always really hot from the heat of the motor...
Hey Rev, on my Axis there was no insulation inside the metal engine enclosure and not even carpet by the gas pedal. Talk about HOT! I cleaned the metal inside with isopropyl and then covered it with Hoodliner and aluminum taped the joints. Ahhh! Relief!
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Old 01-21-2018, 03:09 PM   #37
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Extremely hot mine I put outside in the wheel wells under the floor where my feet would be are you saying you put yours inside somewhere? Thank you for the reply.
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SSF-106-40 SumoSprings Solo Front Bump Stop SSR-107-47 SumoSprings Rear Bump Stop
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Old 01-21-2018, 03:59 PM   #38
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Yeah Rev. This was tricky working on my back but a camping pad helped. I cut each piece and peeled the backing but reset it folding back the first couple of inches to grip and remove after setting the piece in place. (Make sense?). I rolled and rubbed to get good adhesion. Removing the valve cover tube made it easier to get along that left side by the gas pedal. A few bad words were heard nearby.
Any questions, just ask.


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I'm wearing trifocals now but my hindsight is 20/20.
*************
Bilsteins and Sumos front and rear...HUGE! FatMat and Hoodliner...HUGE!
Hellwig sway bars F&R, 235/85 Hankook ATM, alignment...HUGE!!!
Battery watering, 260watts Solar and BigFeets to make life easier.
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Old 01-25-2018, 04:22 AM   #39
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sound panel

Is sound panel self adhesive or held in place by tape?
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Old 01-25-2018, 04:25 AM   #40
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Is sound panel self adhesive or held in place by tape?
It is self adhesive....peel and stick.
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