Suspension, Brakes, Drivetrain discuss the wondrous effects of boost and your miata...
Sponsored by:
Sponsored by:

DIY Urethane Motor Mounts

Thread Tools
 
Search this Thread
 
Old 01-08-2010, 12:43 PM
  #21  
Elite Member
Thread Starter
iTrader: (51)
 
gospeed81's Avatar
 
Join Date: Nov 2008
Location: Spring, TX
Posts: 7,257
Total Cats: 26
Default

Originally Posted by Speedwolf
Did you line up the two parts centered in the jig?


I did...not realizing the intentional offset in the OEM design. I'm not going to say it doesn't matter, but I've seen no ill effects in almost 10K miles.

Then again they didn't come out perfectly straight, much like how when I play golf if I want to avoid a hazard I purposely aim for it. Proper orientation would have only been a 50% chance when installed.

Glad someone is using the write up, and thanks for that tip for those that plan on doing this in the future.
gospeed81 is offline  
Old 01-08-2010, 01:06 PM
  #22  
Newb
 
Speedwolf's Avatar
 
Join Date: Mar 2009
Location: Germany
Posts: 17
Total Cats: 0
Default

Ok thanks. ;-)

I will reply when fitted and tested.
But unfortunately i have to change my water pump first... Damn its leaking. But good that i recognized it early enough to prevent any overheating.
Speedwolf is offline  
Old 01-08-2010, 01:44 PM
  #23  
Elite Member
Thread Starter
iTrader: (51)
 
gospeed81's Avatar
 
Join Date: Nov 2008
Location: Spring, TX
Posts: 7,257
Total Cats: 26
Default

Originally Posted by Speedwolf
Ok thanks. ;-)

I will reply when fitted and tested.
But unfortunately i have to change my water pump first... Damn its leaking. But good that i recognized it early enough to prevent any overheating.
Damn leaky waterpumps.

In current outside temps I'd definitely try and oven cure the urethane. I did mine in the heat of summer and left them on 110* asphalt.

It's 23* here right now, and godknowswhat where you're at. They take about a week to cure in decent temps...
gospeed81 is offline  
Old 01-08-2010, 07:06 PM
  #24  
Newb
 
Speedwolf's Avatar
 
Join Date: Mar 2009
Location: Germany
Posts: 17
Total Cats: 0
Default

Oh thats a good advice...
At the moment we have -5,5 Degrees. Thats ~22 in your F scale. ;-)
Speedwolf is offline  
Old 03-29-2010, 10:32 AM
  #25  
Elite Member
Thread Starter
iTrader: (51)
 
gospeed81's Avatar
 
Join Date: Nov 2008
Location: Spring, TX
Posts: 7,257
Total Cats: 26
Default

UPDATE:

Mount failed.


Driver's side mount was completely gone. Motor started moving around a lot last week, and I actually missed a dyno day yesterday because of it. I didn't want to miss all family time by replacing it AND spending half the day with the HMC homos, so I had to pick one. Instead of failing on the dyno and driving it like a beater til next weekend I decided to properly repair it with the MC/MMR hybrids I had on the shelf.

Name:  failedurethanemount.jpg
Views: 1457
Size:  62.9 KB

I'm also partially blaming this for my downpipe failure, since I'm sure it was moving around a lot.


Admittedly, we were very hard on the mounts during the motor swap. The threads must have gotten caught, and we resorted to rocking the chassis when it wouldn't come out, and the motor jumped up 6" when it finally let go. This did break the passenger side urethane mount, but I attributed that to us being idiots. I really thought the motor would come straight up with the mounts installed.

Also, the arm on the hoist wasn't quite long enough, and during reinstall we were pushing back and down on the motor, with all the weight resting on and pushing against the threaded rod of the mount. I'm pretty sure we started a crack then, which propogated over the last few weeks.

Either way, you can't expect these to stay in one piece like the OEM parts. Again, I highly recommend buying one of the proven solutions out there from our vendors. I'm very happy even with just the Mazdacomp mount in on the driver's side, and rocking a backup OEM on the passenger side. I didn't have time to do both, and that OEM one went in during the swap when we had completely ripped the pass side urethane mount.



The two parts from McMaster may adhese better, and could probably be selected stiffer. This material never really felt like it hardened, and is still malleable by hand.
gospeed81 is offline  
Old 03-29-2010, 10:37 AM
  #26  
Elite Member
iTrader: (6)
 
Bond's Avatar
 
Join Date: Nov 2007
Location: Southlake,Texas
Posts: 3,219
Total Cats: 15
Default

If only I could have shipped out a day earlier lol.
Bond is offline  
Old 03-29-2010, 10:41 AM
  #27  
Elite Member
Thread Starter
iTrader: (51)
 
gospeed81's Avatar
 
Join Date: Nov 2008
Location: Spring, TX
Posts: 7,257
Total Cats: 26
Default

Originally Posted by Bond
If only I could have shipped out a day earlier lol.
I think it was just as much work anyhow....and I could have paid a day earlier.

If I ever do another swap I'll probably set the mounts in the K-frame and lower the motor down until the bolt holes line up. That was WAY too much stress on the mounts.
gospeed81 is offline  
Old 12-01-2011, 02:51 PM
  #28  
Senior Member
iTrader: (7)
 
miatauser123's Avatar
 
Join Date: Sep 2009
Location: Royal Oak Michigan
Posts: 754
Total Cats: 68
Default

Originally Posted by fahrvergnugen
How thick is that webbing? It looks more like flashing from the casting at this angle.
This is a super old post but those webs are not structural at all. Just left over material from the mold. I cold stick a toothpick through them.
miatauser123 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Full_Tilt_Boogie
Build Threads
84
04-12-2021 04:21 PM
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM
FrankB
Miata parts for sale/trade
6
09-30-2015 11:48 AM
brandonbkd
MEGAsquirt
0
09-28-2015 11:52 PM



Quick Reply: DIY Urethane Motor Mounts



All times are GMT -4. The time now is 10:20 PM.