The BMW 630CS, produced between 1976 and 1979, represents the entry point into the iconic E24 6 Series lineup. Positioned below the 633CSi and later the 635CSi, the 630CS offered a more accessible way to experience the sophisticated styling and grand touring capabilities of BMW’s flagship coupe. It was a key model in establishing the 6 Series as a benchmark for luxury sports coupes, particularly in the European market, and laid the foundation for the model’s enduring legacy. The E24 chassis, internally designated as the 6 Series, was BMW’s replacement for the earlier 2000C and 2000CS models, aiming for a more modern and upscale experience.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series (E24) |
| Type (Engine) | 630CS (185 Hp) |
| Start of production | 1976 |
| End of production | 1979 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (combined) | 11.4 l/100 km |
| Fuel consumption (US mpg) | 20.6 US mpg |
| Fuel consumption (UK mpg) | 24.8 UK mpg |
| Fuel consumption (km/l) | 8.8 km/l |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.9 sec |
| Acceleration 0 – 62 mph | 8.9 sec |
| Acceleration 0 – 60 mph | 8.5 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Weight-to-power ratio | 7.8 kg/Hp |
| Weight-to-torque ratio | 5.7 kg/Nm |
| Power | 185 Hp @ 5800 rpm |
| Power per litre | 62 Hp/l |
| Torque | 255 Nm @ 3500 rpm (188.08 lb.-ft. @ 3500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M30B30 |
| Engine displacement | 2986 cm3 (182.22 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 89 mm (3.5 in.) |
| Piston Stroke | 80 mm (3.15 in.) |
| Compression ratio | 9:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Carburettor |
| Engine aspiration | Naturally aspirated |
| Engine oil capacity | 5.8 l (6.13 US qt | 5.1 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) |
| 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.) |
| Drag coefficient (Cd) | 0.41 |
| Minimum turning circle | 11.2 m (36.75 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 4 |
| Type of gearbox | Manual transmission |
| 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 630CS was powered by BMW’s M30B30 engine, a 3.0-liter inline-six cylinder powerplant. This engine, a cornerstone of BMW’s engineering prowess during the 1970s and 80s, featured a cast iron block and an aluminum cylinder head. Unlike the later 633CSi and 635CSi models which employed Bosch fuel injection, the 630CS utilized a twin-barrel Solex carburetor. This carburetor setup, while simpler and less expensive, resulted in slightly lower peak power and increased fuel consumption compared to the injected versions. The M30B30 produced 185 horsepower at 5800 rpm and 255 Nm (188 lb-ft) of torque at 3500 rpm. The engine’s robust construction and relatively simple design contributed to its longevity and ease of maintenance. The 630CS was exclusively offered with a four-speed manual transmission, delivering power to the rear wheels.
Driving Characteristics
The 630CS offered a refined and comfortable driving experience, prioritizing grand touring over outright performance. While the 185 hp engine provided adequate power for cruising, it wasn’t as responsive as the higher-output versions. Acceleration from 0 to 60 mph took approximately 8.5 seconds, and top speed was around 130 mph. The four-speed manual transmission offered precise shifts, but the gear ratios were spaced to favor fuel economy and relaxed highway driving rather than aggressive acceleration. Compared to the 633CSi and 635CSi, the 630CS felt less urgent in its response, but it still delivered the characteristic BMW handling balance and steering feel. The relatively lighter weight of the 630CS, compared to its more powerful siblings, did contribute to a more nimble feel in corners.
Equipment & Trim Levels
The 630CS was positioned as the entry-level model in the 6 Series range, and its standard equipment reflected this. It typically included cloth upholstery, basic instrumentation, and manual windows. Power steering and air conditioning were often optional extras. Interior trim was relatively understated, focusing on functionality and durability. However, even the base 630CS offered a level of refinement and build quality that was uncommon in its price bracket. Optional extras included a sunroof, leather upholstery, and upgraded audio systems. The dashboard layout was typical of BMWs of the era, with a driver-focused design and clearly marked gauges.
Chassis & Braking
The E24 6 Series chassis was a monocoque construction, providing a rigid and stable platform. The 630CS featured independent suspension all around, with McPherson struts at the front and a semi-trailing arm suspension at the rear. This suspension setup provided a comfortable ride while maintaining good handling characteristics. Braking was accomplished via ventilated discs at the front and solid discs at the rear. The braking system was effective for the car’s weight and performance, but it lacked the anti-lock braking system (ABS) that became available on later 6 Series models. The 630CS featured a relatively narrow tire size (195/70 R14) which contributed to its comfortable ride but limited its ultimate grip.
Market Reception & Comparison
The 630CS was generally well-received by automotive critics, who praised its elegant styling, comfortable ride, and solid build quality. However, some critics noted that the carburetor-equipped engine lacked the refinement and performance of the fuel-injected models. Compared to the 633CSi, the 630CS offered a more affordable entry point into the 6 Series range, but it sacrificed some performance and features. Fuel economy was reasonable for a car of its size and era, averaging around 20.6 US mpg. Reliability was generally good, thanks to the robust M30 engine and BMW’s reputation for engineering excellence.
Legacy
The BMW 630CS, while often overshadowed by its more powerful siblings, remains a desirable classic car. The M30B30 engine is known for its durability and relatively simple maintenance requirements. Today, well-maintained 630CS models are sought after by enthusiasts who appreciate their classic styling and driving experience. The carburetor-equipped engine can require more frequent tuning than the fuel-injected versions, but parts availability is generally good. The 630CS represents a unique and accessible entry point into the world of the iconic BMW 6 Series, offering a blend of style, comfort, and reliability that continues to appeal to collectors and enthusiasts alike.
