One of the biggest problems in most cars is soggy motor mounts.
This could be caused by torn or damaged motor mounts or they are
just too soft. This can result in a few different problems. In the
case of rod shifter manual transmissions, (up to 6g civics and 3g
Integras) soggy motor mounts can lead to quite a bit of shifter
movement. This problem alone isn't that bad.
The problem with less than satisfactory motor mounts comes into
play under heavy launching. Power hopping, or wheel hop, is one of
the main problems. Soft motor mounts can act like rubber bands
during hard launches. When the engine torques over, it puts pressure
on the motor mounts before it goes through to the wheels. Once the
motor mounts are pushed to the limit the wheels start turning. What
can happen is that the motor can bounce violently causing a little
more power to hit the ground (from the tension in the bushings) and
cause the car to hop.
Hopping leads to poor 60ft times, loose interior pieces will go
flying and worst of all, drive train damage. A broken CV joint can
really put a damper at the strip (personal experience!).
There are few solutions out there. Energy Suspension makes poly
urethane motor mount inserts. HAsport makes solid poly urethane
motor mounts. The cost of the bushings isn't really that bad, but
those on a tight budget may be interested in a less costly method.
Replacing every bushing with poly urethane bushings of any type may
be a bit harsh so I would try one mount at a time.
When I originally swapped in my B18C1, my torque motor mounts
were already very weak and showing signs of complete failure. The
torque mounts help to prevent movement caused by torque. (duh!). If
these mounts are weak they can lead to excessive engine movement and
cause undesired results. I decided to try a trick that pretty much
every Nissan guy out there has tired: Do it your self poly urethane
motor mounts. I chose 3M window weld per a friend's recommendation.
It's easy to find and relatively easy to work with.
What you'll need:
- A tube of 3M's window weld ($10.99 at Advanced Auto)
- Caulk gun ($1.99 at Wal-Mart)
- Brake cleaner or some sort of cleaning solvent
- Something flat and about an inch wide (see pics)
- Proper tools to remove the desired motor mount
As you can see, my torque mounts were completely trashed. My
thought was that I would only be wasting about $11 on the window
weld if I didn't like it. I needed new mounts anyway so I gave it a
Before I started filling the mounts, I took a second to clean
them with brake cleaner. Any cleaning solvent should work fine.
Given the fact that my mounts were in multiple pieces, I had to make
sure that they didn't move around while I filled. It wasn't as hard
as I thought it would be.
Start by filling the mount roughly half way in. Make sure you
don't leave any air pockets. This can probably be accomplished by
squeezing the material all the way through. If you didn't chose
that route, flip it over and fill it up the rest of the way. I
chose to go a little over board with the material and make the mount
a little thicker.
Once you are satisfied with the amount of the material, it's time
to smooth it out. This may only be a cosmetic issue, but I felt
that it would help push the material into areas that you may have
Once you are complete satisfied with your work set it aside and
do not touch it for at least a day. I found that waiting a few
days allows it to fully cure. However, 24 hours should be more than
enough time to allow it to cure and reinstall.
Here are a few shots of the cured mounts as well as shots of the
mounts installed in my civic.
*Note: If you have access to rubber gloves, I would very
seriously recommend their use during this process. The black "goo"
is almost impossible to remove from you hands.
I am thoroughly impressed with the effect of the torque mounts.
In the case of my civic, there was significantly less shifter
movement. Coupled with my Z-10 radius arms, I've eliminated wheel
hop. Even in the most likely wheel hop situations I've experienced
smooth and controlled wheel spin along with very solid
Since I only modified two of the 5 mounts on my civic, there
really isn't that much more vibration inside the car. When it's
fairly cold out I do experience more buzzing interior trim but it's
only at idle.
I would suggest this modification to anyone interesting in a very
low cost edge.
Note: I've seen quite a few people make comments
about this idea's reliability and it's appearance. The
reliability of this setup is excellent! After a year of abuse
and a horrible accident, these mounts held up on my civic.
I'll be reusing them in my current civic.
As for the appearance issue, this is a budget repair. Most
budget projects do not turn out as show quality pieces.