The Citroën CX I Break 2400 Cmatic, produced between 1978 and 1980, represents a unique iteration of Citroën’s innovative CX series. Positioned as a luxurious and practical estate (station wagon) variant, it offered a blend of advanced technology and spaciousness. This model occupied a mid-range position within the CX Break lineup, offering a step up in performance and refinement compared to the lower-displacement engines, while remaining more accessible than the top-tier, higher-horsepower versions. The CX, as a whole, was a significant vehicle for Citroën, embodying their commitment to hydropneumatic suspension and aerodynamic design, and the Break version expanded its appeal to families and those requiring substantial cargo capacity.
Technical Specifications
| Brand | Citroen |
| Model | CX |
| Generation | CX I Break |
| Type (Engine) | 2400 (116 Hp) Cmatic |
| Start of production | 1978 |
| End of production | 1980 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel Type | Petrol (Gasoline) |
| Maximum speed | 170 km/h (105.63 mph) |
| Weight-to-power ratio | 12.2 kg/Hp, 81.7 Hp/tonne |
| Weight-to-torque ratio | 7.9 kg/Nm, 126.8 Nm/tonne |
| Power | 116 Hp @ 5500 rpm |
| Power per litre | 49.4 Hp/l |
| Torque | 180 Nm @ 2750 rpm (132.76 lb.-ft. @ 2750 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | M23.623 |
| 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 | 1420 kg (3130.56 lbs) |
| Max. weight | 2095 kg (4618.68 lbs) |
| Max load | 675 kg (1488.12 lbs) |
| Trunk (boot) space – minimum | 1100 l (38.85 cu. ft.) |
| Trunk (boot) space – maximum | 2030 l (71.69 cu. ft.) |
| Fuel tank capacity | 68 l (17.96 US gal | 14.96 UK gal) |
| Length | 4922 mm (193.78 in.) |
| Width | 1734 mm (68.27 in.) |
| Height | 1456 mm (57.32 in.) |
| Wheelbase | 3095 mm (121.85 in.) |
| Front track | 1474 mm (58.03 in.) |
| Rear (Back) track | 1390 mm (54.72 in.) |
| Front overhang | 1050 mm (41.34 in.) |
| Rear overhang | 777 mm (30.59 in.) |
| Ride height (ground clearance) | 155 mm (6.1 in.) |
| Drag coefficient (Cd) | 0.43 |
| Minimum turning circle (turning diameter) | 12.70 m (41.67 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 | 3 gears, automatic transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Steering type | Steering rack and pinion |
| Wheel rims size | 5.5J x 14 |
Powertrain & Engine Architecture
The CX I Break 2400 Cmatic was powered by the M23.623 engine, a 2.4-liter inline-four cylinder petrol engine. This engine, a mainstay of several Peugeot and Citroën models of the era, featured a cast iron block and an aluminum cylinder head. 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 the time, though less sophisticated than fuel injection systems. The engine produced 116 horsepower at 5500 rpm and 180 Nm (132.76 lb-ft) of torque at 2750 rpm. The “Cmatic” designation refers to the three-speed automatic transmission, a significant feature for a car of this era, offering a level of convenience not commonly found in European vehicles. This transmission was a traditional hydraulic automatic, known for its smooth, if not particularly quick, shifts.
Driving Characteristics
The 2400 Cmatic offered a comfortable, albeit not sporty, driving experience. The automatic transmission, while convenient, did detract from the engine’s performance potential. Acceleration was adequate for highway cruising and everyday driving, but lacked the responsiveness of the manual transmission versions or the higher-output engines. The gear ratios were optimized for fuel economy and smooth operation rather than outright speed. The CX’s signature hydropneumatic suspension, however, provided an exceptionally smooth ride, absorbing bumps and imperfections in the road with remarkable ease. This, combined with the comfortable seats and spacious interior, made the CX I Break 2400 Cmatic an excellent long-distance touring vehicle.
Equipment & Trim Levels
The CX I Break 2400 Cmatic came reasonably well-equipped for its time. Standard features included power-assisted steering, ventilated disc brakes on all four wheels, and comfortable cloth upholstery. The interior was characterized by its ergonomic design and high-quality materials. Optional extras included air conditioning, a sunroof, and upgraded audio systems. The Break body style itself added to the practicality, offering a substantial cargo area that could be expanded by folding down the rear seats. The dashboard layout was typical of Citroën’s designs of the period, featuring a combination of analog gauges and switches.
Chassis & Braking
The CX I Break utilized a front-wheel-drive layout with independent suspension on all four wheels, utilizing Citroën’s renowned hydropneumatic system. This system allowed for self-leveling and adjustable ride height, contributing to the car’s exceptional ride quality. The front suspension featured independent double wishbones, while the rear employed trailing arms. Braking was provided by ventilated discs on all four wheels, offering good stopping power for a vehicle of its weight. The steering was a rack-and-pinion system with power assistance, making it relatively easy to maneuver, despite the car’s size.
Market Reception & Comparison
The CX I Break 2400 Cmatic was generally well-received by automotive critics, who praised its ride comfort, spaciousness, and innovative technology. However, the automatic transmission was sometimes criticized for its lack of responsiveness. Compared to the manual transmission versions, the Cmatic offered less engaging driving experience. Compared to the higher-displacement CX models (such as the 2500 or GTI), it offered less outright performance. However, it provided a more affordable and accessible entry point into the CX range, appealing to buyers who prioritized comfort and convenience over sporty handling. Fuel economy was reasonable for a car of its size and era, though not exceptional.
Legacy
The Citroën CX I Break 2400 Cmatic, while not the most sought-after variant of the CX, remains a significant vehicle in automotive history. Its innovative hydropneumatic suspension and aerodynamic design set it apart from its contemporaries. The M23 engine, while not known for being particularly robust, is generally reliable with proper maintenance. Today, the CX I Break 2400 Cmatic is a relatively rare and collectible vehicle, appealing to enthusiasts who appreciate its unique character and engineering. Parts availability can be a challenge, but a dedicated community of CX owners and specialists exists to provide support and assistance. The Cmatic transmission, while smooth, requires careful attention to fluid levels and maintenance to ensure long-term reliability.
