At the beginning of the Seventies the 5 liter engine car was dismissed from the constructors world championship. The regulations only allowed 3 liter displacement engines. Therefore the 917 couldn’t participate anymore. As a result of this Porsche entered races of the “Canadian-American Championships” series known as CanAm championships. The races were running over a distance of 200 miles and were hold ten to eleven times in the USA and Canada. In the beginning the beefy McLaren Lola and Chapparal were dominating the series. In this after group 7 specified racecars almost everything was possible, including engine volume and the use of superchargers.
Porsche was further developing the 917 coupe into an open CanAm-Spyder. The twelve cylinder engine was charged from Porsche with two exhaust turbochargers for the first time, which increased the power to 850 hp.This further development stage brought immediate success. In 1972 George Follmer became CanAm champion on a 917/10 with a 5 liter turbo engine.
In 1973 the popular series was dominated from 917 Porsche racecars in a very special way. Mark Donohue was starting as well in the 917/30, the strongest racecar ever raced in a round-circuit race event. The further evolved twelve cylinder was putting out 1100 hp with 5,4 liter engine displacement. In the final ranking the Porsche team took first, second, third and sixth place.
|Engine:||Twelve-cylinder twin-valve induction engine (Boxer), air-cooled, four overhead camshafts with timing gear|
|Power:||1100 HP at 7.800 RPM|
|Fuel system:||Mechanical injection pump, 400 litre fuel tank|
|Transmission:||Five-speed gearbox, locking differential|
|Chassis:||Aluminium tubular space frame with plastic body, independent wheel suspension, coil springs, internally ventilated disc brakes|
|Dimensions and weight:||Wheel base 2.500 mm
length 4.562 mm
weight 800 kg
|Performance:||0-200 km/h in 5,3 seconds, Top speed approx. 385 km/h|
|Chassis No. of the museum car:||917 30 002|