Below is a list of Dynomometer manufacturers from Romeoville, Illinois. Dynomometers are used to determine the torque and rotations per minute of an engine. They are widely used for automotive applications and are also called dynos, dynometers or dynamometers. Dynomometers test the performance of an engine by letting it run for long intervals at high speeds; however, the vehicle does not move and can be operated by a computer system.