This 911 R Prototype is one of the most significant Porsches ever built. It marks the beginning of a 911 racing dynasty that would span decades and include multiple wins at Le Mans, Sebring, and Daytona.
In 1967, Porsche pulled four examples of their new 911 S off of the production line and set about making racecars out of them. The 911 R was born. These four prototypes, known now as R1, R2, R3, and R4, were to be the beginning of the homologation of a 911 racecar. In fact, after the prototypes only 20 production versions would ever be made. It would not be until the 1973 911 Carrera RS that the homologated 911 racecar would take the world by storm.
The 911 R initial purpose was to demonstrate how much weight could be extracted from a production vehicle. While the production 911 S weighed in around 2300lbs the R came in just over 1800 lbs. This was achieved by the fitting of GFK lightweight fiberglass doors, front and rear decklid, and bumpers. Aluminum hinges were used on the decklids and doors. Thinner steel was used throughout the body. There was no undercoating or sound proofing. Plexi window were used with manual pull straps. It was the ultimate 911 diet.
Some called the 911 R a 906 in a 911 body. It wasn’t far from the truth. The engine was twin-plug 1,991 cc flat six that put out 225 horsepower at 8,000 rpm. That shrieking powerplant was fitted to a 901 transmission with a dogleg first gear. The gearshift was moved back 100mm. The oil tank followed the same construction pattern as the 906 and 910, using the same fittings, filter, and thermostat. Mechanically it was all racecar.