1971 Porsche 917 16-Cylinder Prototype Pictures & Gallery...
The Group 7 class in CanAm was virtually unlimited with regard to regulation, so Porsche was free to try many different avenues to source extra power. Two main themes were explored: the first was to go into uncharted territory and turbocharge engines with an exhaust-driven turbine. Eventually this was the chosen route, but it didn't reach fruition until a larger 16-cylinder engine was tried.
