The Canadian-American Challenge Cup was an “unlimited” racing series co-sanctioned by the SCCA in America and the CASC in Canada. Although governed by a basic set of rules—the cars had to be two-seaters with bodywork covering the wheels, have doors, a windscreen, brake lights and various safety requirements—there were no regulations for dimensions, weight, materials used or size of the tires. That was all left open to the creativity of the designer.
The nickname “unlimited” came from rules allowing engines with no limitations on displacement or number of cylinders, i.e., horsepower. Essentially this was an open series for sports racing cars, and it became a hotbed of new technology and racing car design.
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