natural rubber Engine Mount (front,blue)

In our development, we were able to limit the amount of bushing deflection while also controlling the amount of NVH being transmitted through the bushing itself by the durometer of the urethane insert. We discovered that increasing the durometer stiffness (to nearly the harness of plastic or Delrin), we were able to limit the movement of the bushing so that it didn't move at all. However, we got too much NVH to be used in a street driven car. When we reduced the durometer too much, we had a very comfortable bushing, with stock-like performance. Of course, with our goals, we were looking for performance one could live with everyday.