E90Post
 


The Tire Rack
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > n54 OEM motor mounts and 3M window weld



Reply
 
Thread Tools Search this Thread
      11-30-2019, 08:41 PM   #1
Twinning_N54
Private
Twinning_N54's Avatar
9
Rep
68
Posts

Drives: 2009 BMW 335xi
Join Date: Jul 2018
Location: Hanford

iTrader: (0)

n54 OEM motor mounts and 3M window weld

Any thoughts on adding window weld to a new set of motor mounts?

seems like an easy, cheap modification that would add some stiffness without much NVH (Noise, vibration, and harshness)

but I wanted to know if anyone had any real thoughts on the idea?

I know the IS mount is an upgrade but I wanted to explore this option.

youtuber Vehicular DIY

Attached Images
 
__________________

BOVs | CP | 5"FMIC | MAP1 | DCI | Air Scoop | Coilovers | IN/OUT | STOCK CATS |
Appreciate 0
      12-01-2019, 09:01 AM   #2
Soravia
First Lieutenant
United_States
50
Rep
369
Posts

Drives: 2011 E91 Silver xDrive 6MT
Join Date: Apr 2013
Location: Kentucky

iTrader: (0)

You can also use Polyurethane mixes. But here's the kicker, the bottom piece is still filled with liquid.
Good if you want less vibration, bad if you want performance of a solid rubber.

Not sure how long that window weld will last next to engine heat. There's a ton of heat on turbo.
Appreciate 0
      12-04-2019, 08:06 PM   #3
Twinning_N54
Private
Twinning_N54's Avatar
9
Rep
68
Posts

Drives: 2009 BMW 335xi
Join Date: Jul 2018
Location: Hanford

iTrader: (0)

Quote:
Originally Posted by Soravia View Post
You can also use Polyurethane mixes. But here's the kicker, the bottom piece is still filled with liquid.
Good if you want less vibration, bad if you want performance of a solid rubber.

Not sure how long that window weld will last next to engine heat. There's a ton of heat on turbo.
That's a good question, I'm guessing window weld wasn't made to withstand exhaust heat for long periods of time.

I just settled on just installing OEM motor mounts and will work on other parts of the suspension like the sway bars.

thanks!
__________________

BOVs | CP | 5"FMIC | MAP1 | DCI | Air Scoop | Coilovers | IN/OUT | STOCK CATS |
Appreciate 0
      12-04-2019, 11:33 PM   #4
Soravia
First Lieutenant
United_States
50
Rep
369
Posts

Drives: 2011 E91 Silver xDrive 6MT
Join Date: Apr 2013
Location: Kentucky

iTrader: (0)

Quote:
Originally Posted by Twinning_N54 View Post
That's a good question, I'm guessing window weld wasn't made to withstand exhaust heat for long periods of time.

I just settled on just installing OEM motor mounts and will work on other parts of the suspension like the sway bars.

thanks!
You CAN put in poly AFTER the install. Buy large syringes with tube from Amazon for $10 or so. Put in the poly using tube. I paid $26 or so for 2 lb of poly mix.

About to put in poly on new cheap mounts I just bought. I will try to drill the OE mount BOTTOM and see if I want to replace the liquid that way in the new one as well.
Appreciate 1
FCobra942463.50

      12-05-2019, 09:50 AM   #5
bbnks2
Lieutenant Colonel
846
Rep
1,765
Posts

Drives: 135i N55
Join Date: Jan 2017
Location: NY

iTrader: (0)

Quote:
Originally Posted by Soravia View Post
You CAN put in poly AFTER the install. Buy large syringes with tube from Amazon for $10 or so. Put in the poly using tube. I paid $26 or so for 2 lb of poly mix.

About to put in poly on new cheap mounts I just bought. I will try to drill the OE mount BOTTOM and see if I want to replace the liquid that way in the new one as well.
you could just buy new mounts and be done with it lol. Iv'e messed with poly filling things plenty and it never lasts more than a year or two. Just not worth it for all the labor involved. But as these cars become dirt cheap im sure we'll be seeing more stuff like this.
Appreciate 0
      12-06-2019, 02:28 AM   #6
Soravia
First Lieutenant
United_States
50
Rep
369
Posts

Drives: 2011 E91 Silver xDrive 6MT
Join Date: Apr 2013
Location: Kentucky

iTrader: (0)

Quote:
Originally Posted by bbnks2 View Post
you could just buy new mounts and be done with it lol. Iv'e messed with poly filling things plenty and it never lasts more than a year or two. Just not worth it for all the labor involved. But as these cars become dirt cheap im sure we'll be seeing more stuff like this.
I'm filling the NEW ones with polyurethane!

Have to make sure the bottom holes are plugged though. Duct tape will work.
The liquid is not thin.
Attached Images
 
Appreciate 2
feuer3072.50
FCobra942463.50

      12-07-2019, 06:46 PM   #7
slanteyez
Enlisted Member
5
Rep
30
Posts

Drives: Infiniti G35
Join Date: Sep 2013
Location: San Diego CA

iTrader: (0)

Anyone know if window weld can withstand the high heat from the turbo?
Appreciate 0
      12-08-2019, 12:18 AM   #8
Soravia
First Lieutenant
United_States
50
Rep
369
Posts

Drives: 2011 E91 Silver xDrive 6MT
Join Date: Apr 2013
Location: Kentucky

iTrader: (0)

Quote:
Originally Posted by slanteyez View Post
Anyone know if window weld can withstand the high heat from the turbo?
You can always put some heat shield tape over them, or tin foil you wanna be ghetto super star?
I have some extra foil tape strips, I might think of it when I swap headers to AFE.
Appreciate 0
      12-08-2019, 06:55 PM   #9
Twinning_N54
Private
Twinning_N54's Avatar
9
Rep
68
Posts

Drives: 2009 BMW 335xi
Join Date: Jul 2018
Location: Hanford

iTrader: (0)

Quote:
Originally Posted by bbnks2 View Post
you could just buy new mounts and be done with it lol. Iv'e messed with poly filling things plenty and it never lasts more than a year or two. Just not worth it for all the labor involved. But as these cars become dirt cheap im sure we'll be seeing more stuff like this.
what happens after a year or two? does the filling break down from the heat or stress?
__________________

BOVs | CP | 5"FMIC | MAP1 | DCI | Air Scoop | Coilovers | IN/OUT | STOCK CATS |
Appreciate 0
      12-09-2019, 09:48 AM   #10
streetpro
Private First Class
streetpro's Avatar
Czech_Republic
54
Rep
157
Posts

Drives: e92 335iA
Join Date: Nov 2018
Location: Prague

iTrader: (0)

Garage List
Quote:
Originally Posted by Twinning_N54 View Post
what happens after a year or two? does the filling break down from the heat or stress?
window bond/weld won't do anything, it stays in place, filling the gap... the same with epoxy, I doubt it cracks and slips away...
__________________
"If everything seems under control, you're not going fast enough. Mario Andretti
Appreciate 0
      12-09-2019, 10:06 AM   #11
bbnks2
Lieutenant Colonel
846
Rep
1,765
Posts

Drives: 135i N55
Join Date: Jan 2017
Location: NY

iTrader: (0)

Quote:
Originally Posted by streetpro View Post
window bond/weld won't do anything, it stays in place, filling the gap... the same with epoxy, I doubt it cracks and slips away...
Get back to me in a year and say the same. Two different durometers, molded at separate times, will inevitably separate from one another. Especially "window weld" since it's not actually poly. It will harden and crack away. Quick google search shows just about anyone who as ever done it say the same.
Appreciate 1
FCobra942463.50

      12-10-2019, 05:46 AM   #12
streetpro
Private First Class
streetpro's Avatar
Czech_Republic
54
Rep
157
Posts

Drives: e92 335iA
Join Date: Nov 2018
Location: Prague

iTrader: (0)

Garage List
I agree... it does harden and crack away but as long as has no chance to fall anywhere, it just stays and prevent excessive movements...
__________________
"If everything seems under control, you're not going fast enough. Mario Andretti
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -5. The time now is 08:46 AM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST