The following graphs will help you determine if the absorber's load capacity vs. RPM curve is a suitable match for the engine to be tested*.

"For better control, the engine being tested should not be at the extreme high or low range of the absorber's capacity."

Important: These curves assume full current flow through the absorber. Lowering the power supply/controller's amperage output reduces the maximums shown accordingly.

WARNING: These are only the magnetic limits for each absorber. They do not take into account any other mechanical limits imposed by the dynamometer's other driveline hardware.

Typical curves, other capacity liquid-cooled eddy-current units have similar shaped curves (call for charts specific to a model that meets your required Power and RPM range). Note: Model numbers, like #400-1, indicate the maximum power rating is about 400 Hp and that the unit has 1 rotor. For a given power range, more rotors provide a higher speed rating - than a lager-diameter single rotor.

Minimum Hp requirements for most eddy-current absorbers is too low to bother charting. For example, the combined bearing, seal, and windage drag (at 500 RPM) for a #400 absorber is only about 0.625 horsepower (climbing to just 5.0 Hp at 2,000 RPM).

Liquid Cooled Eddy Current-Absorbers - click here to examine load charts for air-cooled eddy-current absorbers.