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. Along with that thought I haven't found replacement torque mounts.

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.