Walter Röhrl and Porsche 904 GTS - Two Legends
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The 904's mid-engine layout was inherited from the 718, also known as the RSK (from the German term for racing, Rennsport), the factory's leading race car. It was powered by the 1,966 cc (120 cu in) Type 587/3, four-cam flat four-cylinder engine producing 198 hp (148 kW), "probably the most complex four-cylinder" ever. It drove a five-speed transmission with a standard 4.428:1 final drive, with available 4.605, 4.260, 3.636, and 3.362 ratios.
Begun as the Type 547, its development began in 1953, when the previous VW-based 1,100 cc (67 cu in) flat-four, used in the contemporary 356 and rated at 38 hp (28 kW), hit the limit of its potential. Porsche realized it needed something all-new. The brainchild of Dr. Ernst Fuhrmann, later Technical Director, it was hoped to achieve an "unheard of" 70 hp (52 kW) per 1 l (61 cu in), relying on hemispherical combustion chambers (what would be called hemi in the U.S.) and 46 mm (1.8 in)-throat 46IDA3 three-choke Weber carburetors to generate 112 hp (84 kW) from the 1,500 cc (92 cu in) four-cam engine. The 1.5 liter weighed 310 lb (140 kg) dry, eventually producing 180 hp (134 kW). A complex design that proved "very taxing" to build and assemble, but very durable, it was used in 34 different models, including 550 Spyders, 356 Carreras, and F2/1s.
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