The BMW 628CSi, produced from 1982 to 1987, represented a key iteration of the E24 6 Series, BMW’s first foray into the luxury coupe market. Positioned as a more accessible entry point into the 6 Series range, the 628CSi offered a blend of performance and refinement, appealing to buyers who desired the styling and prestige of the larger 633CSi and M6, but with a lower price tag and slightly more subdued character. This model benefitted from the 1982 facelift of the E24, incorporating updated styling cues and mechanical improvements. It served as a popular alternative to other grand tourers of the era, such as the Mercedes-Benz SL and Porsche 911.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series (E24, facelift 1982) |
| Type (Engine) | 628CSi (184 Hp) |
| Start of production | 1982 |
| End of production | 1987 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 14.3 l/100 km (16.4 US mpg, 19.8 UK mpg, 7 km/l) |
| Fuel consumption (extra urban) | 6.8 l/100 km (34.6 US mpg, 41.5 UK mpg, 14.7 km/l) |
| Fuel consumption (combined) | 10 l/100 km (23.5 US mpg, 28.2 UK mpg, 10 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 9.1 sec |
| Acceleration 0 – 62 mph | 9.1 sec |
| Acceleration 0 – 60 mph | 8.6 sec |
| Maximum speed | 212 km/h (131.73 mph) |
| Weight-to-power ratio | 7.8 kg/Hp, 128.7 Hp/tonne |
| Weight-to-torque ratio | 6 kg/Nm, 167.8 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 | 1430 kg (3152.61 lbs.) |
| Max. weight | 1850 kg (4078.55 lbs.) |
| Max load | 420 kg (925.94 lbs.) |
| Trunk (boot) space – minimum | 415 l (14.66 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Length | 4755 mm (187.2 in.) |
| Width | 1725 mm (67.91 in.) |
| Height | 1365 mm (53.74 in.) |
| Wheelbase | 2625 mm (103.35 in.) |
| Front track | 1430 mm (56.3 in.) |
| Rear (Back) track | 1460 mm (57.48 in.) |
| Drag coefficient (Cd) | 0.41 |
| Minimum turning circle | 11.2 m (36.75 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears | 4 gears, manual transmission /5 (automatic) |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Tires size | 205/70 R14 |
| Wheel rims size | 14 |
Powertrain & Engine Architecture
The 628CSi was powered by BMW’s M30 inline-six engine, specifically the 2.8-liter variant. This engine, designated M30B28, produced 184 horsepower at 5800 rpm and 240 Nm (177 lb-ft) of torque at 4200 rpm. The engine featured a cast iron block and an aluminum cylinder head, utilizing a single overhead camshaft (SOHC) design with two valves per cylinder. Fuel delivery was handled by Bosch K-Jetronic multi-port fuel injection, a system known for its reliability and precise fuel metering. The M30 engine was renowned for its smooth power delivery and robust construction. The 628CSi was available with either a 4-speed manual transmission or a 5-speed automatic transmission. The automatic, a ZF 3HP22 unit, was a popular choice for buyers prioritizing comfort and ease of driving.
Driving Characteristics
The 628CSi offered a refined grand touring experience. While not as overtly sporty as the M6, the 628CSi provided ample power for comfortable highway cruising and spirited backroad driving. The automatic transmission, while smooth, did slightly diminish acceleration compared to the manual version. The 0-60 mph time was around 8.6 seconds, while the manual version could achieve it in around 7.8 seconds. The automatic’s gear ratios were optimized for fuel efficiency and relaxed cruising, rather than outright performance. The car’s weight distribution, close to 50/50, contributed to balanced handling, and the suspension provided a comfortable ride without feeling overly soft.
Equipment & Trim Levels
The 628CSi came reasonably well-equipped as standard. Interior features included cloth upholstery, power windows, central locking, and a basic sound system. Leather upholstery, a sunroof, and upgraded audio systems were available as optional extras. The dashboard layout was typical of BMWs of the era, with a driver-focused design and clear instrumentation. Trim levels were relatively simple, with options primarily revolving around interior materials and convenience features. The 628CSi was positioned as a step above the base 630CSi in terms of standard equipment and engine performance.
Chassis & Braking
The E24 6 Series featured an independent suspension system all around. The front suspension utilized McPherson struts with coil springs and an anti-roll bar, while the rear suspension employed a semi-trailing arm design with coil springs. This setup provided a good balance between ride comfort and handling precision. Braking duties were handled by ventilated disc brakes at the front and solid disc brakes at the rear. An Anti-lock Braking System (ABS) was available as an option, enhancing safety and control during hard braking. The steering system was a cone worm and recirculation ball setup, providing a relatively direct feel.
Market Reception & Comparison
The 628CSi was generally well-received by automotive critics. It was praised for its stylish design, comfortable interior, and refined driving experience. However, some critics noted that the automatic transmission could feel somewhat sluggish, and the car’s weight contributed to a less agile feel compared to smaller sports coupes. Compared to the 633CSi, the 628CSi offered a more affordable entry point into the 6 Series range, albeit with slightly less power. Fuel economy was reasonable for a car of its size and performance, averaging around 23.5 mpg in combined driving. Reliability was generally good, although maintenance costs could be higher than those of more mainstream vehicles.
Legacy
The BMW 628CSi remains a desirable classic car today. The M30 engine is known for its durability and relatively straightforward maintenance. However, like all classic BMWs, regular maintenance is crucial to prevent issues. Parts availability is generally good, although some specific components can be difficult to find. The 628CSi’s combination of classic styling, comfortable interior, and reliable powertrain has ensured its continued popularity among enthusiasts. Values have been steadily increasing in recent years, reflecting the growing demand for well-preserved examples of this iconic BMW coupe. The automatic transmission models, while not as sought after by purists, offer a more accessible and comfortable driving experience for many owners.
