The powerpull challenge is a true head-to-head competition. Each team must build a powerpuller, weighing up to 1 ton, which will be chained to each other. The teams will then compete in a tug of war (best 2 out of 3) to determine victory.

Before we get to the show, a quick powerpuller lesson. A powerpuller is, more or less, a tractor that produces an enormous amount of horsepower that will pull a sled, weighted down with concrete blocks. The big tires at the rear are for traction and the small tires at the front...well...aren't much good for anything since they're in the air most of the time. Steering, if needed can be accomplished by braking one of the rear tires. Gently.
 
 

The Orange Team's expert  Powerpulling champ Mark Pacey	The Yellow's expert  University teacher John Kilgour
Robert reveals the days building challenge	Kali? Did you find what you're looking for?
This is what a real powerpuller looks like	Robert paints a scene
The Yellow's engine...a V8	The Orange's V6 Size doesn't necessarily matter
Kali's cooking with fire now!	Exactly what you need A beefy wheel for the rear
Robert chats with powerpulling association chairman Neal Davis about the team's designs	Major Dick's wild organizational chart looks...uh...unorganized
Robert attempts to tell Bowser he's driving	Dave Price welds his seat securely