The Type 547 engine with four cams fitted to the Porsche 718 was a wonder in terms of design but it was very complex and difficult to assemble, and despite some good results the sporting records of Porsche were often limited by mechanical problems during the races.
The ultimate evolution of the Porsche 718 was made mandatory by a change in racing regulations. The RS 60 of 1960, continued without modification in 1961 as the RS 61, provides an increased volume in excess of the previous 1.5 liters and a lengthened chassis to improve the comfort in the cockpit.
To offset this handicap, Porsche is studying the aerodynamics. The RS 60 and 61 have a very low Spyder body, even closer to the ground through the small diameter of the wheels. The suspension and brakes have also been reworked to improve the handling on the road.
Stirling Moss loved this model which he drove in the Targa Florio in 1961. He acquired a unit for his last professional outing at Le Mans in 2011, aged 81. His RS 61 was sold for £ 1.9 million including premium by Bonhams on June 26, 2015.
A few Spyders was specially built for the official drivers of the brand. A works racing RS 60 is estimated $ 5.5M, for sale by Gooding in Pebble Beach on August 16, lot 143. Here is the link to the press release.