The BMW 628CSi, produced between 1979 and 1982, represents a pivotal point in the first generation (E24) of the 6 Series. Positioned as a more accessible entry point into the 6 Series range, it offered a blend of performance and luxury without the higher price tag of the flagship 633CSi and later 635CSi models. Built on the BMW E24 platform, the 628CSi aimed to capture a broader audience seeking a sophisticated grand tourer. It was primarily marketed in Europe and North America, offering a compelling alternative to rivals like the Mercedes-Benz SL and Porsche 928.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series (E24) |
| Type (Engine) | 628CSi (184 Hp) |
| Start of production | 1979 |
| End of production | 1982 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| 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 | 208 km/h (129.25 mph) |
| Weight-to-power ratio | 7.9 kg/Hp, 126.9 Hp/tonne |
| Weight-to-torque ratio | 6 kg/Nm, 165.5 Nm/tonne |
| Power | 184 Hp @ 5800 rpm |
| Power per litre | 66 Hp/l |
| Torque | 240 Nm @ 4200 rpm (177.01 lb.-ft. @ 4200 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M30 |
| Engine displacement | 2788 cm3 (170.13 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 86 mm (3.39 in.) |
| Piston Stroke | 80 mm (3.15 in.) |
| Compression ratio | 9.3:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 5.8 l (6.13 US qt | 5.1 UK qt) |
| Coolant | 12 l (12.68 US qt | 10.56 UK qt) |
| Kerb Weight | 1450 kg (3196.7 lbs.) |
| Max. weight | 1830 kg (4034.46 lbs.) |
| Max load | 380 kg (837.76 lbs.) |
| Trunk (boot) space – minimum | 415 l (14.66 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Permitted trailer load with brakes (12%) | 1800 kg (3968.32 lbs.) |
| Length | 4755 mm (187.2 in.) |
| Width | 1725 mm (67.91 in.) |
| Height | 1365 mm (53.74 in.) |
| Wheelbase | 2626 mm (103.39 in.) |
| Front track | 1422 mm (55.98 in.) |
| Rear (Back) track | 1487 mm (58.54 in.) |
| 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 /5 |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Steering type | Worm-reduction unit |
| Tires size | 195/70 R14 |
| Wheel rims size | 14 |
Powertrain & Engine Architecture
The heart of the 628CSi is the M30 inline-six engine, a powerplant renowned for its smoothness and durability. Specifically, the 628CSi utilized the 2.8-liter (2788cc) version of the M30, producing 184 horsepower at 5800 rpm and 240 Nm (177 lb-ft) of torque at 4200 rpm. This engine featured multi-port fuel injection, a significant advancement over earlier carbureted BMW engines, contributing to improved fuel efficiency and throttle response. The engine’s design incorporated a cast iron block and an aluminum cylinder head, a common configuration for BMW six-cylinder engines of the era. The 628CSi was available with either a 4-speed manual transmission or a 5-speed manual transmission, offering drivers a choice depending on their preference. The automatic transmission option, while less common, provided a more relaxed driving experience.
Driving Characteristics
The 628CSi, with its 184 hp and relatively lighter weight compared to the 633CSi and 635CSi, offered a balanced driving experience. Acceleration from 0 to 60 mph took approximately 8.8 seconds, and it could reach a top speed of around 129 mph. While not as overtly sporty as its higher-powered siblings, the 628CSi provided ample power for comfortable highway cruising and spirited backroad driving. The manual transmission versions offered a more engaging experience, allowing drivers to fully utilize the engine’s torque. The automatic transmission, while smooth, did result in some power loss and a slightly less responsive feel. The suspension, tuned for comfort, provided a compliant ride, absorbing bumps and imperfections in the road effectively.
Equipment & Trim Levels
The 628CSi came reasonably well-equipped as standard, reflecting its positioning as a premium coupe. Standard features typically included power windows, central locking, and a high-quality sound system. The interior was typically trimmed with cloth upholstery, although leather was available as an option. Optional extras included a sunroof, air conditioning, and upgraded audio systems. The dashboard layout was classic BMW, with a driver-focused design and clear, easy-to-read gauges. The 628CSi’s trim level was generally considered the entry-level offering within the E24 6 Series range, making it more accessible to a wider range of buyers.
Chassis & Braking
The E24 6 Series featured a robust chassis with independent suspension all around. The front suspension utilized a McPherson strut design with coil springs and an anti-roll bar, while the rear suspension employed a semi-trailing arm setup with coil springs. This configuration provided a good balance of handling and ride comfort. Braking duties were handled by ventilated disc brakes at the front and solid disc brakes at the rear. The braking system was effective, providing ample stopping power for the car’s weight and performance. Steering was accomplished via a worm-reduction unit, offering a reasonably direct feel.
Market Reception & Comparison
The 628CSi was generally well-received by automotive critics. It was praised for its stylish design, comfortable ride, and refined engine. However, some critics noted that it lacked the outright performance of the 633CSi and 635CSi. Compared to its siblings, the 628CSi offered a more affordable entry point into the 6 Series range. It was also more fuel-efficient than the larger-engined models. In terms of reliability, the M30 engine proved to be exceptionally durable, and the 628CSi generally enjoyed a good reputation for long-term dependability.
Legacy
Today, the BMW 628CSi is a sought-after classic car, appreciated for its timeless design and driving experience. The M30 engine remains highly regarded for its reliability and ease of maintenance. While examples in excellent condition are becoming increasingly rare, the 628CSi continues to offer a compelling alternative to more expensive and less practical classic coupes. The car’s enduring appeal lies in its ability to blend luxury, performance, and style in a way that few other cars of its era could match. The 628CSi represents a sweet spot in the E24 lineup, offering a classic BMW experience without the premium price tag of the higher-performance models.
