The Opel Commodore was an executive car (E-segment) produced by Opel from 1967 to 1982. It is the six-cylinder variant of the Rekord with styling differences. The Commodore nameplate was used by Opel from 1967 to 1982. However, its nameplate/lineage continues with the Australian Holden Commodore. The last generation was sold in the United Kingdom primarily as the Vauxhall Viceroy although Opel models were also sold.
Commodore A (1967–1971)
The Opel Commodore A was manufactured from 1967 to 1971, based on the Rekord C. After having offered a Rekord-6 powered by a 2.6 L 6-cylinder engine since March 1964, Opel in February 1967 launched the Commodore as a faster up-market version of the Rekord. The Commodore was initially available with the known A 2.2-litre six or a larger 2.5 L engine developing 115 PS (85 kW; 113 hp) with a single carburettor. Body styles comprised a two-door or four-door notchback saloon and a two-door hardtop/fastback coupé. In September 1967 the sporty Commodore GS offering 130 hp (96 kW) from a dual-carburettor 2.5 L-six was introduced.
For the 1969 model year, the carryover 2.2-litre six was dropped and the optional 2-speed Powerglide automatic was abandoned in favor of Opel's new 3-speed automatic transmission.
From September 1969, the base 2.5 L-engine was pumped up to 120 PS (88.3 kW; 118.4 hp); at the same time, both remaining engines received hydraulic lifters for smoother running, a new exhaust system and six camshaft bearings. The handbrake lever was moved from its position under the dash to a location between the front seats and the fuel tank was enlarged from 55 to 70 litres.
An even more sporty model than the GS, the Commodore GS/E, debuted in March 1970. It had a 2.5 L engine equipped with Bosch D-jetronic fuel injection system developing 150 PS (110 kW; 150 hp), which gave the car a top speed of 197 km/h (122 mph). The Commodore GS/E also had a career in motorsports, with a car prepared by Steinmetz. In April 1970 a Commodore with a detuned and carburetted 2.8 L-six giving 145 PS (106.6 kW; 143.0 hp) followed (GS 2800).
156,330 Commodore As were built, including 2,574 GS and GS/E variants.
The Commodore A "V body" platform was used by GM to produce other models in many markets, these include the GM Ranger sold in mainland Europe and also in South Africa together with the GM Opala which was built and sold in South America from 1968 through to 1992. The Opala has a very big following in South America. Their production commenced two years after the Commodore A debut in 1966.
GS/E History
All engines for the Commodore were 12 valve, CIH straight-six engines ranging from 2.2 to 2.8 litres. All but one engine option had single-barrel (2.2) or double-barrel (2.5; 2.8) downdraught carburetor. in 1970 the GS/E model was introduced which as its badge implies didn't utilise carburetors. The "E" meaning Einspritzung or injection in English.
Opels didn't have the reputation for performance cars in the period and they had seen the positive impact on sales for other race winning manufacturers on having performance models in their range of cars. Opel wanted to be in this area of the market and the results of this desire was the Commodore GS/E.
The carburettors were ditched in favour of a Bosch D-Jetronic, Bosch's first commercially produced electronic fuel injection system. Bosch D-Jetronic was a very early version of multi-point EFI, the “D” stood for “drucksensorgesteuert” (pressure sensor regulated). Unlike later Bosch fuel injection system, the injection was direct to the cylinder instead of via the Plenum inlets, which meant the a specific cylinder head was manufactured specifically for the engine, making this model unique and expensive to produce and purchase. Different from older mechanical injection systems, it incorporated taking input from the pressure inside the intake manifold. This is known as the Air Mass Sensor or in modern terms this would be known as the MAP-sensor (manifold absolute pressure), a part that's commonly found in more modern vehicles.
Bosch sold the patent to Japanese companies that continue to produce injection systems based on D-Jetronic.
D-Jetronic fuel injection was installed onto the 2.5 litre engine with the modified cylinder head, increasing power by 20 bhp (15 kW), making it more powerful than the larger 2.8 litre engine. The fuel injected engine, named 2500 E, now produced 150 hp (112 kW; 152 PS) at 5,800 rpm and 196 N⋅m (145 lbf⋅ft) of torque at 4,500 rpm with an unchanged compression ratio of 9.5:1. For comparison, the base model Porsche 911T in 1970 had 25 PS (18 kW; 25 hp) less, but was more expensive. The GS/E could accelerate from 0–100 km/h (62 mph) in 9.5 seconds, a similar value to the same period Porsche 911. It could also reach a top speed of 192 km/h (119 mph).
The GS/E Coupe model is known affectionately as the "German Charger".
Words from the official advert for the car from 1970:
150 bhp at your right foot ... power to kick you ahead. Acceleration that pushes you into the seats. Six cylinders that receive their fuel served electronically. An engine that doesn't let a single octane go to waste. GS/E: a lurking grumble in the two exhaust tubes.
Source: Wikipedia
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