These came off my VANE dyno, used for brake testing.

They are a 20HP 3 phase motor supported on pillow block bearings. Springs are installed to provide linear movement of the resistive load cell in relation to torque.

You can brake these motors using a DC current similar to an eddy retarder. Suitable for low power, low duty - gokarts, bikes etc. Should be a fair bit of info on various forums about using a 3 phase motor as a retarder.

Located near Goulburn, NSW, Australia.

$600 for the pair