Below is a list of Dynometer manufacturers from Ann Arbor, Michigan. Dynometers are machines that measure the power of an engine by determining its torque and rotations per minute. Also called dynos or dynomometers, these machines are used extensively in automotive applications. Most dynos are constructed of basic components including a frame, engine mounts, an absorption unit, a heat exchanger and a torque measuring device. Some styles require water or oil for proper resistance and absorption.