The new 2.4-liter, sixcylinder engine increased output for the 911S from 180 horsepower at 6,500 revolutions per minute in 1971 to 190 horsepower. When the 911S first debuted in 1967, output was 160 brake horsepower at 6,600 revolutions per minute; thus by 1972 Porsche had increased displacement from 1,991cubic centimeters (2 liters) to 2,341cubic centimeters (2.4 liters) and added an additional 30 brake horsepower to the 911S. The 1973 model had a compression ratio of 8.5:1 and Bosch mechanical fuel injection. Photo: Dennis Adler.

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