 Two Porsche 718 RS61/60 at Nürburgring | |||||||||
| Category | Sportscar, F1, F2 | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Constructor | Porsche | ||||||||
| Designer(s) | Wilhelm Hild[1]: 221 | ||||||||
| Predecessor | Porsche 550 | ||||||||
| Technical specifications[2] | |||||||||
| Chassis | Spaceframe chassis | ||||||||
| Suspension (front) | torsion bars, telescopic shock absorbers, anti-roll bar | ||||||||
| Suspension (rear) | Watt-linkage, coil springs over telescopic shock absorbers | ||||||||
| Engine | Type 547 1,498 cc (91.4 cu in)DOHCF4boxer engine normally aspiratedMid-engined | ||||||||
| Transmission | 5-speedmanual | ||||||||
| Weight | 570 kg (1,256.6 lb) | ||||||||
| Fuel | Petrol | ||||||||
| Competition history | |||||||||
| Notable entrants | Porsche System Engineering, Ecurie Maarsbergen | ||||||||
| Notable drivers | Graham Hill,Stirling Moss,Wolfgang von Trips,Edgar Barth,Carel Godin de Beaufort,Jo Bonnier,Dan Gurney,Hans Herrmann,Nino Vaccarella,Gerhard Mitter | ||||||||
| Debut | 1957 Le Mans – Sportscars 1960 Italian Grand Prix – F1 | ||||||||
| |||||||||
| Teams' Championships | 0 | ||||||||
| Constructors' Championships | 0 | ||||||||
| Drivers' Championships | 5 (European Hill Climb) | ||||||||
ThePorsche 718 is a series of one- or two-seatsports-racing cars built byPorsche from 1957 to 1962. Anopen-wheel single-seat model was developed for Formula racing.
The 718 was a development of the successfulPorsche 550A with improvements made to the body work and suspension. The car's full name is 718 RSK, where "RS" stands forRennSport (sports-racing) and the "K" reflects the shape of the car's revised torsion-bar suspension.[3] It had amid-engined layout and used the 142 horsepower (106 kW) 1.5-litre Type 547/3 quad-cam engine introduced in the 550A.
In 1957 theFédération Internationale de l'Automobile (FIA) changed their rules to allow cars with enveloping bodywork to compete in Formula races.[4]: 27 That year Porsche entered three 550/1500RS Spyders in the German Grand PrixFormula Two (F2) event. Changes to the cars were minimal, being limited to removing the passenger seats and spare tires.[5]
For 1958 Porsche fielded a modified 718, called the RSK Mittellenker (centre-steer), for F2 events.[6] The bodywork for this car was only slightly different from the sportscar model, but the single seat was now in the centre of the cockpit, with the steering wheel, pedals, and shift lever relocated to accommodate the change and a fairing enclosing more of the cockpit opening.[7]: 65 Jean Behra drove the car to a win at the F2 event at Reims that year. At the German Grand Prix at theNürburgring, driverEdgar Barth placed sixth overall and second in his class. At the Berlin Grand Prix at AVUS the car won both its heat and the F2 class in the hands of driverMasten Gregory.
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In 1959 Porsche unveiled the prototype of a narrow, open-wheeled car called the Porsche 718/2 that married the 718's mechanicals with a more traditional single-seat Formula body.[8] The unpainted car was entered in the 1959 Monaco Grand Prix, where driverWolfgang von Trips qualified twelfth, but crashed on the second lap of the race. At Reims driverJoakim Bonnier finished third. For 1960 the production 718/2, starting with chassis number 718201, received revised bodywork, a 6-speed transaxle, and a wheelbase extended by 100 mm (3.9 in).[5][9]: 278–281 A total of five cars were built. Some of these four-cylinder cars were later raced in F1 under the 1962 11⁄2 litre formula.
In October 1958 the FIA had announced another change to the regulations for Formula One (F1).[10]: 12 Beginning in the 1961 season, engine capacity would be limited to the same 1.5 litres as in Formula Two. This meant that Porsche could use their 718/2s almost unchanged in F1.
For the 1960 season theFIA made changes to the regulation regarding the windscreen and cockpit size. These rules changes together with a larger (1.6-litre) Type 547/3 engine, developing 160 horsepower (120 kW) and a new double wishbone rear suspension brought about the RS 60 model. The RS 60 brought Porsche victory at the 196012 Hours of Sebring with a car driven byHans Herrmann andOlivier Gendebien. 1960 also saw Porsche win theTarga Florio with Hans Herrmann being joined on the winner podium byJo Bonnier andGraham Hill. The RS 60 also ensured that Porsche successfully defended their European Hill Climb Championship for the third year in a row.
For 1961 the model name was changed to "RS 61" although it was almost identical to the RS 60. An RS 61 won the European Hill Climb Championship.[11]
The W-RS version was developed in 1961. Initially fitted with a 4-cylinder engine, the car was later fitted with Porsche's air-cooledType 771 2.0 Lflat-eight engine which produced 240 horsepower (180 kW).[12] A W-RS finished 8th at Le Mans in1963. The W-RS continued Porsche's success in the European Hill Climb Championship with Edgar Barth claiming the title in 1963. Porsche would go on to win a European Hill Climb Championship every year until 1982, a total of 42 titles.
The W-RS continued racing until 1964 when it was replaced by the904.
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A Coupé version was developed from the RS 61. Initially fitted with a 4-cylinder engine, this car was also upgraded to an 8-cylinder F1 derived engine which produced 210 horsepower (160 kW).[13] The car was also fitted with disc brakes. A GTR Coupé enabled drivers Jo Bonnier andCarlo Maria Abate to win theTarga Florio in 1963 once more.
The 718 made its racing debut at the1957 24 Hours of Le Mans driven byUmberto Maglioli andEdgar Barth. The car failed to finish the race due to an accident.
In 1958, the RSK Spyder #29 (1.6-litre engine) finished third overall atLe Mans guided byJean Behra andHans Herrmann. Right after them, in fourth place overall and first in class came the RSK #31 (1.5-litre engine), piloted by Edgar Barth and Paul Frère. Jean Behra also drove one of the cars home finishing second at theTarga Florio (an FIAWorld Sportscar Championship race from 1955–1973).
In 1959, the car, driven by Edgar Barth andWolfgang Seidel, achieved overall victory at the Targa Florio for its first time. A 718 also won theEuropean Hill Climb Championship in both 1958 and 1959. A 718 RS60 won the Targa Florio again in 1960.
In 1961Masten Gregory and Bob Holbert piloted a 718/4 RS Spyder to a class win atLe Mans. In 1963, Porsche got another Targa Florio victory, with a 718 GTR Coupé, making it three wins at that event for a 718 car.
Porsche made their F2 debut with victories atReims[14] andAVUS[15] in 1958. In 1959 other RSK's were converted for single seater racing and at the XV B.A.R.C. '200' at Aintree in 1960 Porsche scored a 1–2–3 victory withStirling Moss, Jo Bonnier and Graham Hill all in 718s.[16] The feat was repeated again later in the year at the race atZeltweg, Austria.[17]
Formula One switched to a 1.5-litre formula in1961 and Porsche entered three 718s forDan Gurney,Hans Herrmann andJo Bonnier. Gurney scored three 2nd places (France,Italy andUnited States) taking him to 4th place in the Drivers' Championship. For1962, Porsche entered a new car, thePorsche 804 in Formula One.
Carel Godin de Beaufort, a privateer, entered a 718 in F1 between1961 and1964. He was killed driving his 718 during practice for the1964 German Grand Prix at theNürburgring.[18]
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