The Citroën CX 2400, produced between 1980 and 1982, represented a significant evolution in Citroën’s long history of innovative automotive engineering. Positioned as a mid-range offering within the CX series, the 2400 model aimed to provide a balance between performance, comfort, and affordability. It was part of the first generation of the CX (Series I), identifiable by its initial design features and pre-facelift styling. The CX, as a whole, was intended as a replacement for the venerable Citroën DS, carrying forward the torch of hydropneumatic suspension and advanced technology, but in a more modern and streamlined package. This variant, with its 2.4-liter engine and 120 horsepower, served as a popular choice for buyers seeking a spacious, comfortable, and technologically advanced family car.
Technical Specifications
| Brand | Citroen |
| Model | CX |
| Generation | CX I |
| Type (Engine) | 2400 (120 Hp) |
| Start of production | 1980 year |
| End of production | 1982 year |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Hatchback |
| Seats | 5 |
| Doors | 5 |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 11 sec |
| Acceleration 0 – 62 mph | 11 sec |
| Acceleration 0 – 60 mph | 10.5 sec |
| Maximum speed | 185 km/h (114.95 mph) |
| Weight-to-power ratio | 10.9 kg/Hp, 91.6 Hp/tonne |
| Weight-to-torque ratio | 6.7 kg/Nm, 149.6 Nm/tonne |
| Power | 120 Hp @ 5500 rpm |
| Power per litre | 51.1 Hp/l |
| Torque | 196 Nm @ 2750 rpm (144.56 lb.-ft. @ 2750 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | M23.639 |
| Engine displacement | 2347 cm3 (143.22 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 93.5 mm (3.68 in.) |
| Piston Stroke | 85.5 mm (3.37 in.) |
| Compression ratio | 8.75:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Carburettor |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 5.3 l (5.6 US qt | 4.66 UK qt) |
| Coolant | 11 l (11.62 US qt | 9.68 UK qt) |
| Kerb Weight | 1310 kg (2888.06 lbs.) |
| Max. weight | 1840 kg (4056.51 lbs.) |
| Max load | 530 kg (1168.45 lbs.) |
| Trunk (boot) space – minimum | 325 l (11.48 cu. ft.) |
| Fuel tank capacity | 68 l (17.96 US gal | 14.96 UK gal) |
| Permitted trailer load with brakes (12%) | 1300 kg (2866.01 lbs.) |
| Length | 4659 mm (183.43 in.) |
| Width | 1734 mm (68.27 in.) |
| Height | 1360 mm (53.54 in.) |
| Wheelbase | 2845 mm (112.01 in.) |
| Front track | 1474 mm (58.03 in.) |
| Rear (Back) track | 1360 mm (53.54 in.) |
| Front overhang | 1050 mm (41.34 in.) |
| Rear overhang | 764 mm (30.08 in.) |
| Ride height (ground clearance) | 155 mm (6.1 in.) |
| Drag coefficient (Cd) | 0.37 |
| Minimum turning circle (turning diameter) | 11.80 m (38.71 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the front wheels of the vehicle. |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | 5 gears, manual transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Steering type | Steering rack and pinion |
| Wheel rims size | 5.5J x 14 |
Powertrain & Engine Architecture
The Citroën CX 2400 was powered by the M23.639 engine, a 2.4-liter inline-four cylinder gasoline engine. This engine, while not particularly powerful by modern standards, was known for its smoothness and relative reliability. It utilized a single overhead camshaft (SOHC) valvetrain with two valves per cylinder. Fuel delivery was managed by a Solex C35 PHH carburetor, a common setup for European cars of the era. The engine’s design prioritized drivability and fuel efficiency over outright performance. The engine’s 8.75:1 compression ratio was a compromise between performance and the fuel quality available at the time. The engine was transversely mounted, a layout that maximized interior space and contributed to the CX’s distinctive handling characteristics. The five-speed manual transmission was a standard feature, providing drivers with a good degree of control over the engine’s power band.
Driving Characteristics
The CX 2400, with its 120 horsepower and 144.56 lb-ft of torque, offered respectable, though not exhilarating, performance. Acceleration from 0 to 60 mph took around 10.5 seconds, and it had a top speed of approximately 115 mph. The five-speed manual transmission allowed drivers to keep the engine in its optimal power range, but the engine lacked the low-end grunt of larger displacement engines. Compared to the later CX 2500 or the more performance-oriented models, the 2400 felt less responsive. However, the CX’s hydropneumatic suspension system provided an exceptionally smooth and comfortable ride, masking the car’s speed and making long journeys effortless. The steering was light and precise, contributing to the car’s overall ease of driving. The combination of front-wheel drive and the hydropneumatic suspension resulted in a stable and predictable handling balance.
Equipment & Trim Levels
The CX 2400 was generally well-equipped for its time, though the level of luxury varied depending on the specific trim level. Standard features typically included comfortable cloth upholstery, a comprehensive instrument panel, and power-assisted steering. Optional extras included air conditioning, a sunroof, and upgraded audio systems. The interior design was typically understated and functional, reflecting the Citroën’s focus on practicality and comfort. The dashboard layout was driver-focused, with all essential controls within easy reach. The CX 2400 aimed to provide a comfortable and refined interior environment, though it didn’t reach the levels of opulence found in some of its German competitors.
Chassis & Braking
The CX featured Citroën’s renowned hydropneumatic suspension system, which utilized self-leveling spheres filled with nitrogen and hydraulic fluid. This system provided an incredibly smooth ride, absorbing bumps and imperfections in the road surface with ease. The front suspension utilized double wishbones, while the rear suspension employed trailing arms. Braking duties were handled by ventilated discs at the front and solid discs at the rear, providing adequate stopping power for the car’s weight and performance. The steering system was a rack-and-pinion setup, offering precise and responsive steering feel. The CX’s chassis was designed to prioritize ride comfort and handling stability, rather than outright sporty performance.
Market Reception & Comparison
The Citroën CX 2400 was generally well-received by automotive critics, who praised its innovative technology, comfortable ride, and spacious interior. However, some critics noted that the engine lacked the power and refinement of some of its competitors. Compared to other cars in its class, such as the Peugeot 504 or the Ford Taunus, the CX offered a unique driving experience thanks to its hydropneumatic suspension. Fuel economy was reasonable for the time, but not exceptional. Reliability was a mixed bag, with some owners reporting issues with the hydropneumatic system and the carburetor. However, the CX’s overall build quality was generally good, and many examples are still on the road today.
Legacy
The Citroën CX 2400, while not the most powerful or fastest version of the CX, remains a significant model in Citroën’s history. It represented a continuation of the company’s tradition of innovation and engineering excellence. The M23 engine, while not a high-performance unit, proved to be relatively durable and is still serviceable today with proper maintenance. The hydropneumatic suspension system, though complex, continues to be admired for its ability to provide an exceptionally comfortable ride. In the used car market, the CX 2400 is sought after by enthusiasts who appreciate its unique character and advanced technology. Finding well-maintained examples can be challenging, but the CX 2400 offers a distinctive and rewarding driving experience for those willing to invest the time and effort.
