The Alleged Can-Am Killer
Between 1972 and 1973, Penske Racing (along with Donohue as the primary test and development driver) was commissioned by Porsche to assist with development of the 917/10. Donohue extensively tested the 917-10, offering up his substantial engineering knowledge to the Porsche engineers in order to design the best possible race car to compete in the Can-Am series. Donohue's desire to succeed almost led to his undoing. During testing of the 917-10 at Road Atlanta, Donohue had recommended larger brake ducts to the Porsche engineers, in order to provide more efficient cooling, and thus less fade and degradation as a race wears on.
The Porsche engineers obliged, but in doing so, caused the new brake ducts to interfere with the bodywork closure pins, which attach the bodywork to the car. Coming out of turn seven, the rear bodywork flew off the car at approximately 150 mph (240 km/h), causing the car to become extremely unstable. The car lifted off the ground and tumbled multiple times down the track. The front of the car was completely torn away, leaving Donohue, still strapped to his safety seat, with his legs dangling outside the car. Amazingly, Donohue only suffered a broken leg. George Follmer, Donohue's old Trans-Am teammate, resumed testing the 917-10 while Donohue was recuperating. In classic Donohue style, Donohue said of Follmer testing his car:
| “ | It just doesn't feel right. Seeing another man driving your car, a car you know so well. I imagine it must feel like watching another man in bed with your wife. | ” |
Porsche, Penske, and Donohue quickly started the development of the 917-30, complete with a reworked aerodynamic "Paris" body and a 5.4-liter turbocharged Flat-12 engine whose output could be adjusted between approximately 1100 and 1500 bhp by turning a boost knob located in the cockpit. During the development of this motor, the German Porsche engineers often asked Donohue if the motor finally had enough power. His tongue-in-cheek answer was "it will never have enough power until I can spin the wheels at the end of the straightaway in high gear."
The 917-30 is referred to, erroneously, as "The Can-Am Killer" as it dominated the competition, winning every race but one of the 1973 Can-Am championship, however, the SCCA imposed fuel limitations for all Can-Am races due to the existing Arab Oil Embargo. Because of this, Porsche and McLaren withdrew from the series. It generally is considered one of the most powerful and most dominant racing machines ever created.
Read more about this topic: Mark Donohue
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