Porsche 911 S/RSR

In the early 1970s, Porsche took over in sports car racing where Ferrari left off, encouraged by the FIA’s shift from exotic sports prototypes to production-based machinery. Logically, Porsche selected its proven 911 for further development as a racing car and homologated the RS 2.7 Carrera in 1972 for Group 4 competition by taking the 2.4-liter 911 S and subjecting it to a myriad of improvements. Next, the much more radical RSR Carrera was created to meet the new Group 5 rules.

In their RSR, Peter Gregg and Hurley Haywood famously charged to victory in the 24 Hours of Daytona, the first race of the 1973 World Manufacturers’ Championship. By season’s end, the Carrera RSR had won the European championship for Grand Touring Cars, the Camel GT Challenge Cup (IMSA), the Targa Florio and numerous races in the SCCA’s Trans Am Championship. From this point, the mighty RSR utterly dominated GT racing for many years to follow.

The Porsche 911 S/RSR, was a 2.4-liter 911 S when new in 1972, and then it was subsequently built and up-rated to 1974 IMSA 3.0 RSR specification and was raced in period by well-known Porsche aficionados Tim Selby and Earl Rowe. They were very prominent in Porsche circles for their racecars, which ran very successfully at some of the most high-profile races throughout the United States at circuits including Daytona, Sebring and Watkins Glen. Factory parts for the racing upgrades were bought directly from Frau Behr at Porsche AG, and Indy car builder Grant King built the r oll cage. Mason Racing built the racing fuel cell and oil tank to IMSA regulations.

This car was auctioned off by RM Auctions in August of 2011 at the Portola Hotel & Spa and Monterey Conference Center, Monterey, California.

3.0-liter air-cooled, horizontally opposed six-cylinder twin-plug racing engine, five-speed Type 915 manual gearbox in rear transaxle, limited-slip differential, RSR-type fully adjustable four-wheel independent suspension with Bilstein coil-over shock absorbers, and 930 Turbo-type four-wheel hydraulic disc brakes. Wheelbase: 89.3"

Source: RM Auctions
Photo Credit: Copyright Tim Scott

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