# Audi F103

F103 is the internal designation for a series of car models produced by Auto Union in West Germany from 1965 to 1972, derived from the earlier DKW F102. To signify the change from a two-stroke to four-stroke engine, the DKW marque was dropped in favour of Audi, a name that had been dormant since before the Second World War.

## Models

The first model was launched simply as the Audi, later being renamed the Audi 72 (72 being the nominal power output of the engine in PS).
The more powerful Audi 80 and Audi Super 90 sports saloons (with 80 and 90 PS respectively) appeared in 1966: in 1968 the arrival of the less powerful Audi 60 completed the range. Breaking somewhat with the naming pattern, the Audi 60 has 55 PS (40 kW), although export versions produce 65 PS (48 kW).
The Audi 75 replaced both the Audi 72 and the Audi 80 from 1969 onwards.
In 1972 the F103 series was discontinued in favour of the "B1" Audi 80.

## Engines

The F103 series were equipped exclusively with the M118 four-cylinder four-stroke engine. These were longitudinally mounted. This combination of front-wheel drive, which Auto Union's DKW brand had pioneered during the 1930s, and the longitudinal positioning of a four-cylinder engine would provide the basic template for Volkswagen's successful new Passat as well as the Audi models Audi 80 and Audi 100 after Volkswagenwerk AG acquired the Auto Union from Daimler-Benz late in 1964. Since the chassis on the F103 was taken from the DKW F102 with a three-cylinder two-stroke engine, the longer engine meant that the cooling system had to be offset to the left of the engine instead of the normal position in front of it. Because of the radiator's location, the front cylinder of the engine had a tendency to run cooler than the other three and as a consequence the spark plug tended to foul up, particularly if the engine was often used in city traffic. To avoid this, it was often recommended to run a hotter spark plug (with a lower heat range) in the front cylinder than in the other three.
The engines of the F103 series were developed by Daimler-Benz as part of a military project that never came to fruition. They were dubbed the Mitteldruckmotor (medium-pressure engines) because of their unusually high BMEP (mean effective pressure, as calculated from brake torque) values, which led to a good thermodynamic efficiency. The engines had spiral-formed intake channels that gave the fuel-air mixture a good swirl. The engine had Heron-type combustion chambers with broad squish bands, further enhancing the mixture swirl and aiding good combustion. These features made it possible to use very high compression ratios for the time. The initial engine version had a compression ratio of 11:1 for 98 RON fuel and even the engines intended for 92 RON fuel had a compression of 9:1, which was a very unusually high value for the time.

## Running gear

The car came with a four-speed manual transmission.
Inboard mounted front disc brakes were featured, which was still unusual in the mid-size car market at this time. The rear brakes followed the more conventional drum configuration.

## Bodywork

The F103 bodyshell was a development of the earlier DKW F102. The engine compartment had to be extended so that the new four-cylinder engine could be accommodated. The front and tail were also cosmetically revised: Audi F103s sold in Europe all featured quasi-rectangular headlamps which were becoming fashionable at the time, whereas the F102 had used round headlamp units.
All Audi F103 models were offered as sedans with two and four doors. The two-door saloon/sedan, however, was not sold in markets such as Italy and Britain with little demand for two-door cars of this size.
With the exception of the Audi Super 90, the F103 series were available also as three-door station wagon models. Making its debut at the Geneva Motor Show in March 1966, this was called, like the Volkswagen estate/station wagon models, Variant.

## Evolution

Initial changes were concentrated under the hood/bonnet where during the first two years of production the specification for the Solex carburetor was changed twice and in September 1967 the very high compression ratio was reduced from a (then) eye watering 11.2:1 to 9.1:1 which addressed serious "teething problems" with the engine as originally launched.
In September 1967 servo-assistance for the brakes became an option, the brakes on all but the basic model now being controlled using twin braking circuits, and by (in Germany) the final months of 1968 the range had settled down to three models, with the entry level Audi 60 powered by a 55 PS motor, the less basic Audi 75 producing 75 PS and the Audi Super 90 with 90 PS, able to challenge the performance image of some of the smaller BMWs.
Visually the car changed very little, but keen eyed observers would have noticed a discreetly modernised rear from August 1970, with slightly larger rear lights and a reshaped bumper. The fuel filler moved from its location to the right of the license plate on the rear panel to a position on the right hand wing of the car, and following a general trend of the period was now shielded by a flap that was flush with the bodywork. Inside the 1970 upgrade also involved a reconfigured dashboard.

## Sales

During the early 1960s, Auto Union was in commercial retreat: the Audi F103 was a relative success when compared with recent Auto Union products, even if its commercial success was trumped by subsequent Audi models. In July 1967, it was reported that 100,000 Audis had been completed: production of the F103 had by now built up to a rate of almost 40,000 per year and the company was moved to deny speculation that another new Audi model would be presented at the Frankfurt Motor Show in the Autumn / Fall of 1967. (The Audi 100 was introduced only towards the end of 1968.)
Audi Super 90 US Sales :
| Year | US Sales |
| 1970 | 6,557 |
| 1971 | 2,425 |
| 1972 | 1,928 |

## Specifications

Manufacturer's figures except where stated
| Audi F103 | Audi 60 2- or 4-door saloon/sedan 3-door 'Variant' estate/station wagon | Audi 72 2- or 4-door saloon/sedan 3-door 'Variant' estate/station wagon | Audi 75 2- or 4-door saloon/sedan 3-door 'Variant' estate/station wagon | Audi 80 2- or 4-door saloon/sedan 3-door 'Variant' estate/station wagon | Audi Super 90 2- or 4-door saloon/sedan |
| Years Produced | 1968–1972 | 1965–1969 | 1969–1972 | 1966–1969 | 1966–1972 |
| Units Produced | 216,988 | 122,579 | 122,579 | 122,579 | 49,794 |
| Engine | M118 4-cylinder-inline engine (four-stroke), longitudinally front-mounted | M118 4-cylinder-inline engine (four-stroke), longitudinally front-mounted | M118 4-cylinder-inline engine (four-stroke), longitudinally front-mounted | M118 4-cylinder-inline engine (four-stroke), longitudinally front-mounted | M118 4-cylinder-inline engine (four-stroke), longitudinally front-mounted |
| Bore x Stroke | 80 mm x 74.4 mm | 80 mm x 84.4 mm | 80 mm x 84.4 mm | 80 mm x 84.4 mm | 81.5 mm x 84.4 mm |
| Displacement | 1496 cc | 1697 cc | 1697 cc | 1697 cc | 1761 cc |
| Max. Power | 55 PS (40 kW; 54 hp) export: 65 PS (48 kW; 64 hp) | 72 PS (53 kW; 71 hp) | 75 PS (55 kW; 74 hp) | 80 PS (59 kW; 79 hp) | 90 PS (66 kW; 89 hp) |
| at engine speed | 4750 rpm | 5000 rpm | 5000 rpm | 5000 rpm | 5200 rpm |
| Compression Ratio | 9.1:1 | 11.2:1 | 9.1:1 | 11.0:1 | 10.6:1 |
| Acceleration 0–100 km/h (0–62 mph) | 18.0 s | 14.8 s | 14.5 s | 14.0 s | 12.2 s |
| Max Speed | 138 km/h (86 mph) 144 km/h (89 mph) | 148 km/h (92 mph) | 150 km/h (93 mph) | 152 km/h (94 mph) | 163 km/h (101 mph) |
| Fuel feed | single Solex carburetor | single Solex carburetor | single Solex carburetor | single Solex carburetor | single Solex carburetor |
| Valvetrain, cooling | OHV, water-cooled | OHV, water-cooled | OHV, water-cooled | OHV, water-cooled | OHV, water-cooled |
| Electrical system | 12-volt | 12-volt | 12-volt | 12-volt | 12-volt |
| Front suspension | Double wishbone, torsion bar | Double wishbone, torsion bar | Double wishbone, torsion bar | Double wishbone, torsion bar | Double wishbone, torsion bar |
| Rear suspension | Beam axle, Trailing-arms, Panhard rod, Torsion bar | Beam axle, Trailing-arms, Panhard rod, Torsion bar | Beam axle, Trailing-arms, Panhard rod, Torsion bar | Beam axle, Trailing-arms, Panhard rod, Torsion bar | Beam axle, Trailing-arms, Panhard rod, Torsion bar |
| Brakes | Front inboard discs / Rear drum brakes | Front inboard discs / Rear drum brakes | Front inboard discs / Rear drum brakes | Front inboard discs / Rear drum brakes | Front inboard discs / Rear drum brakes |
| Body structure | Monocoque | Monocoque | Monocoque | Monocoque | Monocoque |
| Dry weight | 960–1,065 kg (2,116–2,348 lb) | 960–1,065 kg (2,116–2,348 lb) | 960–1,065 kg (2,116–2,348 lb) | 960–1,065 kg (2,116–2,348 lb) | 960–1,065 kg (2,116–2,348 lb) |
| Track front/rear | 1,343 mm (52.9 in) / 1,327 mm (52.2 in) | 1,343 mm (52.9 in) / 1,327 mm (52.2 in) | 1,343 mm (52.9 in) / 1,327 mm (52.2 in) | 1,343 mm (52.9 in) / 1,327 mm (52.2 in) | 1,343 mm (52.9 in) / 1,327 mm (52.2 in) |
| Wheelbase | 2,490 mm (98 in) | 2,490 mm (98 in) | 2,490 mm (98 in) | 2,490 mm (98 in) | 2,490 mm (98 in) |
| Length x Width x Height | 4,380 mm (172 in) x 1,626 mm (64.0 in) x 1,451 mm (57.1 in) | 4,380 mm (172 in) x 1,626 mm (64.0 in) x 1,451 mm (57.1 in) | 4,380 mm (172 in) x 1,626 mm (64.0 in) x 1,451 mm (57.1 in) | 4,380 mm (172 in) x 1,626 mm (64.0 in) x 1,451 mm (57.1 in) | 4,380 mm (172 in) x 1,626 mm (64.0 in) x 1,451 mm (57.1 in) |
| Steering, turning circle | rack & pinion, 10.59 m (34 ft 9 in) | rack & pinion, 10.59 m (34 ft 9 in) | rack & pinion, 10.59 m (34 ft 9 in) | rack & pinion, 10.59 m (34 ft 9 in) | rack & pinion, 10.59 m (34 ft 9 in) |
* ↑ Excludes estate 'Variant' bodied cars.