Is it illegal to drive without a hood on my car in wisconsin?

Not legal advice: there is no law in Wisconsin specifically addressing the necessity of a car to be equipped with a hood.

There is great discussion over the matter on internet forums, but we found no one claiming to have actually been ticketed. There is also nothing in the Wisconsin Statutes & Annotations to cite for such a ticket.

The hood does serve a purpose, or rather purposes. A vehicle’s aerodynamics are designed with the vehicle in stock condition which would of course include a hood. Should a fire break out in the engine compartment, a hood can help maintain the flames. Also, the insulation on the bottom side of the hood on many cars figures into properly maintaining the temperature of the engine.