Porsche 911
History of the Porsche 911
Until 1977
Source: Wikipedia
The Porsche 911 was developed as a much more powerful, larger, more comfortable replacement for the Porsche 356, the company's first model, and essentially a sporting evolution of the Volkswagen Beetle. The new car made its public debut at the 1963[1] Internationale Automobil-Ausstellung, better known to English speakers as the Frankfurt Motor Show.
It was designated as the "Porsche 901" (901 being its internal project number). Peugeot protested on the grounds that they owned the trademark to all car names formed by three numbers with a zero in the middle. So, before production started, the new Porsche had its name changed to 911. It went on sale in 1964, giving buyers their most competent alternative rival yet to the hugely desirable Jaguar E Type.
The earliest editions of the 911 had a 130 PS[1] (96 kW) six-cylinder engine, in the "boxer" configuration like the 356, air-cooled and rear-mounted, displaced 1991 cm³ (cc) compared with the 356's four-cylinder, 1600 cc unit. The car had four seats although the rear seats are very small, and the car is usually called a 2+2 rather than a four-seater (the 356 was also a 2+2). It was mated to a five speed manual "Type 901" transmission. The styling was largely by Ferdinand "Butzi" Porsche, son of Ferdinand "Ferry" Porsche. Erwin Komenda, the leader of the Porsche car body construction department, was also involved in the design.
The 356 came to the end of its production life in 1965, but there was still a market for a 4-cylinder car, particularly in the USA. The Porsche 912, introduced the same year, served as a direct replacement. It used the 356's 4-cylinder, 1600 cc, 90 PS (66 kW) engine but wore the 911 bodywork.
In 1966 Porsche introduced the more powerful 911S, the engine's power raised to 160 PS (118 kW). Alloy wheels from Fuchs, in a distinctive 5-leaf design, were offered for the first time. In motorsport at the same time, installed in the mid-engined Porsche 904 and Porsche 906, the engine was developed to 210 PS (154 kW).
In 1967 the Targa version was introduced. The Targa had a removable roof panel, a removable plastic rear window (although a fixed glass version was offered alongside from 1968) and a stainless steel-clad roll bar. (Porsche had, at one point, thought that the NHTSA would outlaw fully open convertibles in the US, an important market for the 911, and introduced the Targa as a "stop gap" model.) The name "Targa" came from the Targa Florio road race in Sicily, Italy in which Porsche had notable success: victories in 1956, 1959, 1960, 1963, 1964, 1966, 1967, 1968, 1969, 1970 and 1973.
The 110 PS (81 kW) 911T was also launched in 1967 and effectively replaced the 912. The staple 130 PS (96 kW) model was renamed the 911L. The 911R had a very limited production (20 in all). This was a lightweight racing version with thin aluminium doors, a magnesium crankcase, twin-spark cylinder heads, and a power output of 210 PS (154 kW).
In 1969 the B series was introduced: the wheelbase for all 911 and 912 models was increased from 2211 to 2268 mm (87 to 89¼ in), an effective remedy to the car's nervous handling at the limit. The overall length of the car did not change: rather, the rear wheels were relocated aft. Fuel injection arrived for the 911S and for a new middle model, 911E. A semi-automatic Sportomatic[2] model, composed of a torque converter, an automatic clutch, and the four speed transmission, was added to the product lineup.
For MY 1970 the engines of all 911s was increased to 2195 cc. Power outputs were uprated to 125 PS (92 kW) in the 911T, 155 PS (114 kW) in the 911E, and 180 PS (118 kW) in the 911S. The 912 was discontinued, thanks to the introduction of the Porsche 911T as an entry model.
The 2.2 L 911E was called "The secret weapon from Zuffenhausen"[citation needed]. Despite the lower power output of the 911E (155 PS, 114 kW) compared to the 911S (180 PS, 132 kW) the 911E was quicker in acceleration up to 160 km/h (100 mph).
The 1972–1973 model years consisted of the same models of 911— the entry level T, the midrange E and the top of the line S. However, all models got a new, larger 2341 cc (142 in³) engine. This is universally known as the "2.4 L" engine, despite its displacement being closer to 2.3 litres— perhaps to emphasize the increase over the 2.2 L. The new power ratings were 130 PS (96 kW), or 140 hp (104 kW) in the U.S., for the T, 165 PS (121 kW) for the E and 190 PS (140 kW) for the S.
The 911E and 911S used mechanical fuel injection (MFI) in all markets. The 911T was carbureted, except in the US where it also used MFI, which accounts for the 7 kW (9 hp) power difference between the two. In January, 1973, US 911Ts were switched to the new K-Jetronic CIS (Continuous Fuel Injection) system from Bosch. These CIS-powered cars are usually referred to as "1973.5" models by enthusiasts.
With the power and torque increases, the 2.4 L cars also got a newer, stronger transmission, identified by its Porsche type number 915. Derived from the transmission in the Porsche 908 race car, the 915 did away with the 901/911 transmission's "dog-leg" style first gear arrangement, opting for a traditional H pattern with first gear up to the left, second gear underneath first, etc. Some say this was because the dog-leg shift to second gear was inconvenient for city driving, other say it was due to Porsche’s desire to put 5th gear outside the main transmission housing where it could easily be changed for different races. The Sportomatic transmission was still available, but only as a special order.
In 1972 a tremendous effort was made to improve the handling of the 911. Due to the 911's unusual engine placement (rear-mounted, with most of the vehicle's weight concentrated over the rear axle) early 911's were prone to oversteer when driven at the limit, and could easily spin in the hands of an inexperienced driver. In an attempt to remedy this, Porsche relocated the oil tank from its position behind the right rear wheel to in front of it. This had the effect of moving the weight of almost 9 quarts (8.5 L) of oil from outside the wheelbase to inside, improving weight distribution and thus, handling. To facilitate filling of the oil tank, Porsche installed an oil filler door (much like the fuel filler door on the left front fender) on the right rear quarter panel. Unfortunately, this unique design was scrapped after only one year, some say because inattentive gas station attendants were putting gas in the oil tank. The oil tank was subsequently moved back to its original position for MY 1973, and remained there until it was moved back within the wheelbase for the 964 models.
911S models also gained a discreet spoiler under the front bumper to improve high-speed stability. With the car's weight only 1050 kg (2315 lb), these are often regarded as the best classic mainstream 911s. For racing at this time, the 911 ST was produced in limited numbers (the production run for the ST only lasted from 1970 to 1971.) The cars were available with engines of either 2466 cc or 2492 cc, producing 270 PS (199 kW) at 8000 rpm. Weight was down to 960 kg (2166 lb). The cars had success at the Daytona 6 Hours, the Sebring 12 Hours, the 1000 km Nürburgring and the Targa Florio.
These models, valued by collectors, are considered by many to be the greatest classic 911s all-time. RS means Rennsport in
German, meaning motorsport or circuit racing. The Carrera name was reintroduced from the 356 Carrera which had itself been named after Porsche's victories in the Carrera Panamericana races in Mexico in the 1950s. The RS was built so that Porsche could enter racing formulae that demanded that a certain minimum number of production cars were made. Compared with a standard 911S, the Carrera 2.7 RS had a larger engine (2687 cc) developing 210 PS (154 kW) with MFI, revised and stiffened suspension, a "ducktail" rear spoiler, larger brakes, wider rear wheels and rear wings. In RS Touring form it weighed 1075 kg (2370 lb), in Sport Lightweight form it was about 100 kg (220 lb) lighter, the saving coming from the thin-gauge steel used for parts of the bodyshell and also the use of thinner glass. In total, 1580 were made, comfortably exceeding the 500 that had to be made to qualify for the vital FIA Group 4 class. 49 Carrera RS cars were built with 2808 cc engines producing 300 PS (221 kW).In 1974, Porsche created the Carrera RS 3.0 with K-Jetronic
Bosch fuel injection producing 230 PS (169 kW).It was almost twice as expensive as the 2.7 RS but offered a fair amount of racing capability for that price. The chassis was largely similar to that of the 1973 Carrera RSR and the brake system was from the Porsche 917. The use of thin metal plate panels and a spartan interior enabled the shipping weight to be reduced to around 900 kg (1984 lb).The Carrera RSR 3.0 and Carrera RSR Turbo (its 2.1 L engine due to a 1.4x equivalency formula) were made in tiny numbers for racing. The turbo car came second at the
24 Hours of Le Mans in 1974, a significant event in that its engine would form the basis of many future Porsche attempts in sportscar racing, and can be regarded as the start of its commitment to turbocharging.
MY 1974 saw three significant changes. First, the engine size was increased to 2687 cc giving an increase in torque. Second, was the introduction of impact bumpers to conform with low speed protection requirements of US law, these bumpers being so successfully integrated into the design that they remained unchanged for 15 years. Thirdly, the use of K-Jetronic CIS Bosch fuel injection in two of the three models in the line up— the 911 and 911S models, retaining the narrow rear wings of the old 2.4, now had a detuned version of the RS engine producing 150 and 175 PS (110 and 129 kW) respectively.
The Carrera 2.7, now a regular production model, inherited the wider rear wings of the RS together with its 210 PS (154 kW) MFI engine and was indeed mechanically identical to the 1973 RS and still weighed the same at 1075 kg (2370 lb). All three models were given high backed front seats.
The 930 Turbo was introduced in 1975 (see below).
The Carrera 3.0 was introduced in 1976 with what was essentially the Turbo's 2994 cc engine minus the turbocharger, and with K-Jetronic CIS although now developing 200 PS (147 kW).
The well known problem of pulled cylinder head studs with the K-Jetronic 2.7 engine only occurred in hot climates. This emerged in 1975 in California where thermal reactors, aimed at reducing emissions, were fitted below the cylinder heads thus causing heat build up around the magnesium crankcase and then made worse by the lean running K-Jetronic CIS. The fitting of a 5-blade engine fan instead of the usual 11-blade further compounded the situation. Bearing in mind Porsche's largest market being the USA, the 930 Turbo, Carrera 3.0 and all subsequent models used aluminium alloy crankcases which were around 15 lb (7 kg) heavier.
The Bosch K-Jetronic CIS varied fuel pressure to the injectors dependent on the mass airflow. While this system was exceedingly reliable, it did not allow the use of as "hot" cams as MFI or carburettors allowed. Therefore the 911S's horsepower decreased from 190–175 PS (140–128 kW) despite the displacement increase from 2.4–2.7 L. However, the engine did have increased drivability. The 210 PS (154 kW) Carrera 2.7 with MFI was not sold in the US owing to emission regulations— instead they received a 'Carrera' fitted with a 911S engine producing 175 PS (173 hp/129 kW), later reduced to 165 (121 kW), and in California even down to 160 PS (118 kW).
Also produced for the 1976 "model year", for the U.S. market, was the 912E, a 4-cylinder version of the 911 like the 912 that had last been produced in 1969. It used the I-series chassis and the 2.0 Volkswagen engine from the Porsche 914. In all, 2099 units were produced. In 1976 the Porsche 924 took this car's place for the 1977 "model year" and beyond. The power was supplied by a 4 cylinder high performance fuel injection motor also used in the 411 Volkswagen. Less than 6000 were built.