Porsche 917 - the terror of the circuits
Summary
When the seven-liter Fords and Chaparrals became too fast, the CSI changed the regulations. Porsche saw opportunities in this and built the Porsche 917, the most powerful car ever to race on a circuit. This article tells its story and points out the special features of the 917.
This article contains the following chapters
- How the "four-and-a-half" liter twelve-cylinder came about ...
- ... and what it achieved
- Great speed - catastrophic road holding
- The John Wyer team switches from Ford to Porsche
- After the one-make world championship, the CanAm
- More than 1000 hp and less than 800 kg? No problem!
- The 917 is now just a collector's item
Estimated reading time: 12min
Preview (beginning of the article)
The top speed and performance of endurance racing cars reached new heights in 1967. The seven-liter Fords and Chaparrals and the 4.0/4.4-liter Ferraris set incredible lap records everywhere, prompting the Commission Internationale de l'Automobile, the governing body of motor sport, to react as expected. From 1968, an engine capacity limit of three liters applied to all cars in the prototype class. However, it was soon realized that this would greatly reduce the starting fields, and the category of "production sports cars" was created, which had to be built in a series of at least 25 units and were allowed to have an engine capacity of five liters. As a result, the existing Ford GT 40s and Lola Chevrolets with their V8s derived from standard engine blocks retained their chances against the new, barely disguised three-liter Grand Prix cars. The CSI announced this change to the regulations less than three months before the first race. Not entirely undeservedly, the result of this change did not correspond at all to the intentions behind it. Towards the end of 1971, it caused the biggest sensation in the history of endurance racing: in 1970, the Porsche 917 was fully developed, which had actually been created on the basis of the very regulations that had been devised to make the cars slower. For years, Porsche had been building new cars for every important endurance race, which were then sold at the end of the season. This system was no more expensive than maintaining a small number of factory cars, where the risk of fatigue defects was also much greater than with new cars. Porsche had built more than 20 Type 910 cars, so a production minimum of 25 units did not seem to be a problem. So the decision was made to secure the two liters of extra displacement by meeting the production limit. This was first considered in early 1968, and in July the development department began work under the direction of Dipl. Ing. Ferdinand Piëch, a nephew of Dr. Porsche.
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