The BMW 850Csi 5.6, produced between 1992 and 1996, represents the pinnacle of the E31 8 Series grand tourer. Positioned as the high-performance variant of the 8 Series coupe, the Csi (Coupe Sport Individual) featured a significantly upgraded engine and subtle styling enhancements compared to the standard 850i. It was BMW’s flagship coupe during its production run, intended to compete with the likes of the Mercedes-Benz SL and Porsche 928. The 850Csi was a statement of engineering prowess and luxury, embodying BMW’s commitment to a driving experience focused on both performance and refinement. It was only available with a six-speed manual transmission in the US market, making it a particularly sought-after model among enthusiasts.
Technical Specifications
| Brand | BMW |
| Model | 8 Series |
| Generation | 8 Series (E31) |
| Type (Engine) | 850Csi 5.6 (380 Hp) |
| Start of production | 1992 |
| End of production | 1996 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (combined) | 12.8 l/100 km |
| Fuel consumption (US mpg) | 18.4 |
| Fuel consumption (UK mpg) | 22.1 |
| Fuel consumption (km/l) | 7.8 |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6 sec |
| Acceleration 0 – 62 mph | 6 sec |
| Acceleration 0 – 60 mph | 5.7 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Weight-to-power ratio | 5 kg/Hp |
| Weight-to-torque ratio | 3.5 kg/Nm |
| Power | 380 Hp @ 5300 rpm |
| Power per litre | 68.1 Hp/l |
| Torque | 550 Nm @ 4000 rpm (405.66 lb.-ft. @ 4000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | S70B56 |
| Engine displacement | 5576 cm3 (340.27 cu. in.) |
| Number of cylinders | 12 |
| Engine configuration | V-engine |
| Cylinder Bore | 86 mm (3.39 in.) |
| Piston Stroke | 80 mm (3.15 in.) |
| Compression ratio | 9.8:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHC |
| Engine oil capacity | 7.5 l (7.93 US qt | 6.6 UK qt) |
| Coolant capacity | 13 l (13.74 US qt | 11.44 UK qt) |
| Kerb Weight | 1900 kg (4188.78 lbs.) |
| Max. weight | 2340 kg (5158.82 lbs.) |
| Max load | 440 kg (970.03 lbs.) |
| Trunk (boot) space – minimum | 320 l (11.3 cu. ft.) |
| Fuel tank capacity | 90 l (23.78 US gal | 19.8 UK gal) |
| Length | 4780 mm (188.19 in.) |
| Width | 1855 mm (73.03 in.) |
| Height | 1330 mm (52.36 in.) |
| Wheelbase | 2684 mm (105.67 in.) |
| Front track | 1554 mm (61.18 in.) |
| Rear track | 1562 mm (61.5 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 6 |
| Type of gearbox | Manual transmission |
| Front suspension | Wishbone |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 235/45 R17; 265/40 R17 |
| Wheel rims size | 17 |
Powertrain & Engine Architecture
The heart of the 850Csi is the S70B56 engine, a 5.6-liter (5576 cc) naturally aspirated V12. This engine is a significant departure from the 5.0-liter V12 found in the standard 850i. The S70B56 boasts a larger bore and stroke, along with revised cylinder heads and a higher compression ratio (9.8:1). It utilizes a multi-port fuel injection system and a single overhead camshaft (OHC) design per cylinder bank. The engine produces 380 horsepower at 5300 rpm and 550 Nm (405.66 lb-ft) of torque at 4000 rpm. The six-speed manual transmission, sourced from Getrag, was the only transmission option available in the US market for the Csi, providing precise gear changes and enhancing the driving experience. This transmission was specifically chosen to handle the increased power output of the larger V12.
Driving Characteristics
The 850Csi delivers a markedly different driving experience compared to the standard 850i. The increased power and torque, combined with the six-speed manual transmission, result in significantly quicker acceleration. The 0-60 mph sprint takes approximately 5.7 seconds, and the car is electronically limited to a top speed of 155 mph. The manual transmission allows for greater driver control and engagement, making the Csi feel more responsive and agile. While still a large and heavy grand tourer, the Csi handles surprisingly well, thanks to its well-tuned suspension and precise steering. The power delivery is smooth and linear, characteristic of a V12 engine, providing effortless cruising and exhilarating performance when desired.
Equipment & Trim Levels
The 850Csi came standard with a comprehensive list of luxury features, befitting its flagship status. These included leather upholstery, power-adjustable seats with memory function, automatic climate control, a premium sound system, and a sunroof. Unique to the Csi were subtle exterior styling cues, such as a revised front spoiler and rear diffuser. Optional extras included upgraded leather trim, a navigation system (a rarity for the time), and a telephone system. The interior trim was generally more refined than the standard 850i, with a greater emphasis on high-quality materials and craftsmanship.
Chassis & Braking
The E31 8 Series featured an independent suspension system with wishbones at the front and coil springs at the rear. The 850Csi benefited from slightly stiffer springs and dampers compared to the 850i, improving handling and reducing body roll. Braking duties were handled by ventilated disc brakes on all four wheels, assisted by an Anti-lock Braking System (ABS). The braking system provided ample stopping power, even under demanding conditions. The steering was a rack-and-pinion system with hydraulic power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The 850Csi was generally well-received by automotive critics, who praised its powerful engine, refined interior, and impressive handling. However, its high price tag and complex engineering made it a relatively niche product. Compared to the standard 850i, the Csi offered a significant performance upgrade, but at a considerable cost. The manual transmission was a key differentiator for enthusiasts, while the automatic transmission offered in other markets was seen as less engaging. Reliability was generally good, but the complex V12 engine and associated systems required regular maintenance.
Legacy
Today, the BMW 850Csi is a highly sought-after classic car, particularly the US-market manual transmission versions. Its combination of luxury, performance, and exclusivity has made it a favorite among collectors and enthusiasts. The S70B56 engine is considered a masterpiece of engineering, and the car’s timeless design continues to turn heads. While maintenance can be expensive due to the car’s age and complexity, the 850Csi remains a rewarding and enjoyable driving experience, representing a high point in BMW’s grand touring heritage. Well-maintained examples command premium prices in the used car market, reflecting their rarity and desirability.
