Go Back   Thor Forums > Thor Tech Forums > Modifications and Updates
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 08-12-2019, 02:45 PM   #1
Junior Member
 
Brand: Thor Motor Coach
Model: Thor 29M Hurricane
State: Wisconsin
Posts: 28
THOR #7934
engine shroud noise insulation

has anyone done anything to reduce engine noise under the shroud?
__________________

__________________
CHUCK52 is offline   Reply With Quote
Old 08-12-2019, 02:52 PM   #2
Senior Member
 
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 1,317
THOR #6411
Quote:
Originally Posted by CHUCK52 View Post
has anyone done anything to reduce engine noise under the shroud?
A search for "engine noise" returns 216 threads.
__________________

__________________
Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
Beau388 is offline   Reply With Quote
Old 08-12-2019, 02:58 PM   #3
Senior Member
 
dstankov's Avatar
 
Brand: Thor Motor Coach
Model: 2015 Challenger 37ND
State: Virginia
Posts: 3,274
THOR #1469
Here is the thread I started when I did the Challenger

Sound deadening the Challenger - Let the project begin
__________________
Dave
US Army (Ret)
Chester, VA
2015 Thor Challenger 37ND
FMCA - F432054
dstankov is offline   Reply With Quote
Old 08-12-2019, 03:54 PM   #4
Senior Member
 
16ACE27's Avatar
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 2,685
THOR #7035
Quote:
Originally Posted by CHUCK52 View Post
has anyone done anything to reduce engine noise under the shroud?
Yes - Dynamat
__________________
The USER Formally Known As TFryman
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
16ACE27 is offline   Reply With Quote
Old 08-12-2019, 06:27 PM   #5
Senior Member
 
Long & Winding road's Avatar
 
Brand: Thor Motor Coach
Model: 2017 Axis 25.4
State: Arkansas
Posts: 2,279
THOR #12231
Yes, tons of writeups on this mod.

For best results use the heavy duty 50 mil Dynomat asphalt type insulation followed up by the 3/4 inch thick "Fat Mat" (or any other brands you like for the price).

The Name brands IMO are sticky-er and have less odor (I have tried 4 diff brands over the years). But they all lose odor over time so no worries.

Cover the inside of your dog house as well as the ENTIRE fire wall and under your dash (access from under the hood). I was very impressed with the results on my Axis. I also found other areas to add sound and heat insulation over the years. It all adds up. Not as quiet as a DP but very livable.
__________________
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.
Long & Winding road is offline   Reply With Quote
Old 08-12-2019, 08:39 PM   #6
Junior Member
 
Brand: Thor Motor Coach
Model: Vegas 24.1
State: Texas
Posts: 27
THOR #13816
Quote:
Originally Posted by Long & Winding road View Post
Yes, tons of writeups on this mod.

For best results use the heavy duty 50 mil Dynomat asphalt type insulation followed up by the 3/4 inch thick "Fat Mat" (or any other brands you like for the price).

The Name brands IMO are sticky-er and have less odor (I have tried 4 diff brands over the years). But they all lose odor over time so no worries.

Cover the inside of your dog house as well as the ENTIRE fire wall and under your dash (access from under the hood). I was very impressed with the results on my Axis. I also found other areas to add sound and heat insulation over the years. It all adds up. Not as quiet as a DP but very livable.
YES! We were one of the people whose Vegas had zero insulation under the ďdoghouseĒ. We added some Fat Mat hood liner. I wish we had doubled up with dynomat like Road suggested but we might redo it one day. Even with just the 3/4Ē FatMat the improvement was noticeable. Just yesterday I took some of the Frost King duct insulation we bought at Loweís and installed it under the dash on the passenger side inside the RV. Be sure to get the kind that is not fiberglass. I wasnít up to the challenge of trying to install it under the driverís side. There are a lot more wires and cables over there but I did slide some in between the accelerator and the side of the console. My husband started the engine and we were both shocked at how much quieter the engine noise was! We didnít drive it so that will probably change it a bit.

I looked at trying to add some FatMat to the dash under the hood but itís August in SE Texas. Iíll have to wait until itís cooler. Iíll also probably have to take some contortion classes seriously, how do you manage to get up in there?

Finally, can anyone tell me what the firewall looks like and where it is located? I have tried to research it for myself but have been unsuccessful.

Thanks,
Pam
__________________
2019 Thor Vegas 24.1
Safe-T-Plus Silver Steering Stabilizer
SuperSteer Rear Trac Bar
Pabs4 is offline   Reply With Quote
Old 08-12-2019, 08:56 PM   #7
Senior Member
 
Brand: Thor Motor Coach
Model: Vegas 2018 24.1
State: Florida
Posts: 124
THOR #12484
I did precisely what LWR suggested at the time and I am very happy with the results. My dog house was also uninsulated as well as dash AC not hooked up. It was a scorching 7 hour drive from South Florida in August. Dog house is cool to the touch and itís quieter than the diesel sprinter van I had previously.
__________________
mstng is offline   Reply With Quote
Old 08-12-2019, 09:02 PM   #8
Senior Member
 
PAtrailtrimmer's Avatar
 
Brand: Thor Motor Coach
Model: Axis 27.7
State: Pennsylvania
Posts: 148
THOR #12085
Quote:
Originally Posted by mstng View Post
I did precisely what LWR suggested at the time and I am very happy with the results. My dog house was also uninsulated as well as dash AC not hooked up. It was a scorching 7 hour drive from South Florida in August. Dog house is cool to the touch and itís quieter than the diesel sprinter van I had previously.
I recently shot the temperature of my uninsulated dog house...129 F! No wonder it is warm in the cab.

I bought the following to correct both heat and noise.

Design Engineering 050130 Boom Mat Under-Hood Thermal Acoustic Lining, 32" x 54" x .75" (1... https://www.amazon.com/dp/B0055VTOBA...sms_tai_yoDuDb...
__________________
Thor Axis 27.7
PA
PAtrailtrimmer is offline   Reply With Quote
Old 08-12-2019, 09:24 PM   #9
Senior Member
 
Long & Winding road's Avatar
 
Brand: Thor Motor Coach
Model: 2017 Axis 25.4
State: Arkansas
Posts: 2,279
THOR #12231
Quote:
Originally Posted by Pabs4 View Post
Finally, can anyone tell me what the firewall looks like and where it is located? I have tried to research it for myself but have been unsuccessful.

Thanks,
Pam
Its the metal wall between the engine comparment and the inside of the vehicle. Usually you will see the brake boosters bolted to it. Just look under your hood - cant miss it.

Cover the entire under side of your dash starting at the bottom of the windsheild to the fire wall. Then go down the fire wall and roll it under the RV until you run out of good places to stick the insulation to.

Leave opening for wires / hose to poke though. I take your time, it took me hours to insulate my RV properly and I never regreted it. Use a roller to press the insulation firmly for proper adhesion. I duct taped a two or 3 foot pole to a roller in order to push up/back the insulation where my arms could not ready.

I put one to two layers of Dynomat type down first and one to TWO layers of Fat Mat 3/4 inch foam insulatation. But you will want a minium of one layer of each type.
__________________
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.
Long & Winding road is offline   Reply With Quote
Old 08-13-2019, 12:08 AM   #10
Junior Member
 
Brand: Thor Motor Coach
Model: Vegas 24.1
State: Texas
Posts: 27
THOR #13816
Quote:
Originally Posted by Long & Winding road View Post
Its the metal wall between the engine comparment and the inside of the vehicle. Usually you will see the brake boosters bolted to it. Just look under your hood - cant miss it.

Cover the entire under side of your dash starting at the bottom of the windsheild to the fire wall. Then go down the fire wall and roll it under the RV until you run out of good places to stick the insulation to.

Leave opening for wires / hose to poke though. I take your time, it took me hours to insulate my RV properly and I never regreted it. Use a roller to press the insulation firmly for proper adhesion. I duct taped a two or 3 foot pole to a roller in order to push up/back the insulation where my arms could not ready.

I put one to two layers of Dynomat type down first and one to TWO layers of Fat Mat 3/4 inch foam insulatation. But you will want a minium of one layer of each type.
Thanks so much! I will take a look tomorrow. It sounds a bit daunting. Iím sure every outside project will be easier once we are experiencing our two weeks of Fall weather.
__________________
2019 Thor Vegas 24.1
Safe-T-Plus Silver Steering Stabilizer
SuperSteer Rear Trac Bar
Pabs4 is offline   Reply With Quote
Old 08-13-2019, 12:57 AM   #11
Senior Member
 
Oneilkeys's Avatar
 
Brand: Thor Motor Coach
Model: 2016 Axis 24.1
State: Florida
Posts: 2,152
THOR #1765
The other place that I added insulation (besides the dog house and in the engine compartment) was under the passenger desk. When I replaced my chassis battery and had to cut the board under the passenger desk, I put insulation underneath the piece of wood that I cut for access and filled the area underneath the wood with insulation. My passenger says it makes a big difference in noise level. Itís also a lot easier to get to that side of the engine from above.
__________________
Oneilkeys is offline   Reply With Quote
Old 08-13-2019, 12:40 PM   #12
Senior Member
 
Long & Winding road's Avatar
 
Brand: Thor Motor Coach
Model: 2017 Axis 25.4
State: Arkansas
Posts: 2,279
THOR #12231
Yep, under the desk, under the access panel on top of your instrument cluster, behind the Dash radio, in front of the passenger side (under dash) I also added some fire resistant cotton batten and acoustic foam under the dash from the inside of the RV.

Another area under the bulk head over the dash (right in front of the drop down front winshield shade). I used several types of material for that project. Also insulated inside the A pillars and over the side window curtain.

Of coarse everything is hidden and out of view. Im always finding near areas to insulate.

Some of my off the wall insulation make a difference, some dont ....... but I figure it will help some with heating and cooling the RV and it dont cost much and most of the time only takes a few minutes to perform.

But I think over all it adds up to make for a more confortable experience IMO.
__________________
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.
Long & Winding road is offline   Reply With Quote
Old 08-15-2019, 10:39 PM   #13
Junior Member
 
Brand: Thor Motor Coach
Model: Thor 29M Hurricane
State: Wisconsin
Posts: 28
THOR #7934
50 mil is 5/16" thick. why follow up with the fat mat? Also, you say 3/4" thick. This must not be correct.
__________________
CHUCK52 is offline   Reply With Quote
Old 08-16-2019, 03:21 AM   #14
Senior Member
 
Long & Winding road's Avatar
 
Brand: Thor Motor Coach
Model: 2017 Axis 25.4
State: Arkansas
Posts: 2,279
THOR #12231
Quote:
Originally Posted by CHUCK52 View Post
50 mil is 5/16" thick. why follow up with the fat mat? Also, you say 3/4" thick. This must not be correct.
Lots of name brands but I used Dyno Mat and Fat Matt.

I though it was "50 mill" but its ".067 thick".... And I think I saw a ".080 thick". Sorry for the confuzzion... its been a year or more since I purchased the last one.

See below.... This is what I purchased.

Just pick the one with the best price that you like best.

I tired a few off brands but IMO the Dynomat and Fatmat better = sticker, less odor, better quality. So if your doing under your hood / dog house ....get the best so it sticks longer with the high heat in those areas.

https://www.amazon.com/Dynamat-10435...ateway&sr=8-13

https://www.amazon.com/FatMat-Hood-L...y&sr=8-1-spell
__________________
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.
Long & Winding road is offline   Reply With Quote
Old 08-17-2019, 08:21 PM   #15
Senior Member
 
State: Alaska
Posts: 236
THOR #8813
Yes, good quality sound reading material on dog house, floors and doors. Night and day
__________________

__________________
carlgorski is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Thor Industries or any of its affiliates. This is an independent, unofficial site.




All times are GMT. The time now is 06:22 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2