The Opel Commodore B 2.8 GS/E, produced between 1973 and 1975, represented the performance pinnacle of the Commodore B series. Positioned as the top-tier trim, the GS/E (Grand Sport Einspritzung – Grand Sport Injection) offered a significant step up in power and refinement compared to the standard Commodore models. It was a key offering in Opel’s lineup during a period when the brand was gaining recognition for building capable and stylish automobiles, primarily aimed at the European market, offering a blend of luxury and sporting performance. The Commodore B, as a whole, served as Opel’s flagship model, competing with vehicles like the Ford Granada and BMW 5 Series.
Technical Specifications
| Brand | Opel |
| Model | Commodore |
| Generation | Commodore B |
| Type (Engine) | 2.8 GS/E (160 Hp) |
| Start of production | 1973 |
| End of production | 1975 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 9.3 sec |
| Acceleration 0 – 62 mph | 9.3 sec |
| Acceleration 0 – 60 mph | 8.8 sec |
| Maximum speed | 195 km/h (121.17 mph) |
| Weight-to-power ratio | 7.9 kg/Hp, 126.5 Hp/tonne |
| Weight-to-torque ratio | 5.5 kg/Nm, 181 Nm/tonne |
| Power | 160 Hp @ 5400 rpm |
| Power per litre | 57.5 Hp/l |
| Torque | 229 Nm @ 4200 rpm (168.9 lb.-ft. @ 4200 rpm) |
| Engine Model/Code | 28EC |
| Engine displacement | 2784 cm3 (169.89 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 92 mm (3.62 in.) |
| Piston Stroke | 69.8 mm (2.75 in.) |
| Compression ratio | 9.5:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | SOHC |
| Engine oil capacity | 5.5 l (5.81 US qt | 4.84 UK qt) |
| Kerb Weight | 1265 kg (2788.85 lbs.) |
| Max. weight | 1705 kg (3758.88 lbs.) |
| Max load | 440 kg (970.03 lbs.) |
| Trunk (boot) space – minimum | 408 l (14.41 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Length | 4607 mm (181.38 in.) |
| Width | 1728 mm (68.03 in.) |
| Height | 1405 mm (55.31 in.) |
| Wheelbase | 2668 mm (105.04 in.) |
| Front track | 1450 mm (57.09 in.) |
| Rear (Back) track | 1400 mm (55.12 in.) |
| Ride height (ground clearance) | 140 mm (5.51 in.) |
| Drag coefficient (Cd) | 0.46 |
| Minimum turning circle (turning diameter) | 11.2 m (36.75 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 4 gears, manual transmission |
| Front brakes | Disc |
| Rear brakes | Drum |
Powertrain & Engine Architecture
The heart of the Commodore B 2.8 GS/E was the 28EC engine, a 2.8-liter inline-six cylinder powerplant. This engine was a significant upgrade over the smaller displacement engines offered in other Commodore B variants. The 28EC featured a single overhead camshaft (SOHC) valvetrain operating two valves per cylinder. Crucially, the “E” in GS/E denoted the use of Bosch mechanical fuel injection – a multi-port system that delivered fuel directly to each intake port. This was a relatively advanced feature for the time, contributing to improved performance and fuel efficiency compared to carbureted engines. The engine produced 160 horsepower at 5400 rpm and 229 Nm (168.9 lb-ft) of torque at 4200 rpm. The engine’s bore and stroke measured 92mm x 69.8mm, respectively, and it operated with a compression ratio of 9.5:1. The engine was paired with a four-speed manual transmission as standard, although an automatic transmission was also available as an option.
Driving Characteristics
The 2.8 GS/E offered a noticeably more spirited driving experience than its siblings. The fuel injection system provided crisp throttle response and a broader powerband. Acceleration from 0 to 60 mph was achieved in approximately 8.8 seconds, and it could reach a top speed of 195 km/h (121 mph). While not a sports car by modern standards, the GS/E was considered quick for its time. The manual transmission allowed for precise control, while the optional automatic, though less engaging, provided convenience. The rear-wheel-drive layout contributed to balanced handling, although the Commodore B was a relatively large and heavy car, which impacted agility. Compared to the lower-powered Commodore models, the GS/E felt significantly more capable on both city streets and open highways.
Equipment & Trim Levels
The GS/E trim level came well-equipped for the early 1970s. Standard features included a wood-trimmed dashboard, upgraded upholstery (often featuring cloth and vinyl combinations), and a comprehensive instrument cluster. Power steering and four-wheel disc brakes were often included, though sometimes as optional extras depending on the market. The GS/E also featured distinctive exterior styling cues, such as chrome trim, a sporty grille, and often, a rear spoiler. Optional extras included a sunroof, upgraded audio systems, and air conditioning. The interior was designed with comfort and practicality in mind, offering ample space for passengers and luggage.
Chassis & Braking
The Commodore B utilized a traditional body-on-frame construction. The suspension consisted of independent front suspension with coil springs and a rigid rear axle with leaf springs. The GS/E typically featured a thicker front stabilizer bar compared to lower trims, improving handling. Braking was initially provided by front disc brakes and rear drum brakes, although four-wheel disc brakes were available as an option. The steering was a recirculating ball system, providing a relatively heavy but precise feel. The chassis was designed to provide a comfortable ride while maintaining reasonable handling characteristics.
Market Reception & Comparison
The Commodore B 2.8 GS/E was generally well-received by automotive critics. It was praised for its strong performance, refined interior, and comfortable ride. However, some critics noted its relatively high price compared to other vehicles in its class. Compared to the standard Commodore models, the GS/E offered a significant performance upgrade, but at a higher cost. The automatic transmission, while convenient, was often criticized for slightly diminishing performance and fuel economy. The GS/E competed directly with vehicles like the Ford Granada and BMW 5 Series, offering a compelling alternative with its distinctive styling and robust powertrain.
Legacy
The Opel Commodore B 2.8 GS/E remains a sought-after classic car today. The 28EC engine, while not without its maintenance requirements, is generally considered a durable and reliable powerplant when properly maintained. Parts availability can be a challenge, but a dedicated community of enthusiasts ensures that spares are still obtainable. The GS/E’s combination of performance, style, and comfort has cemented its place as a desirable classic, particularly among those who appreciate 1970s European motoring. Well-maintained examples command respectable prices in the used car market, reflecting their rarity and historical significance. The fuel injection system, while complex for its time, is a key element of the car’s appeal, offering a level of sophistication not found in many contemporary vehicles.
