The Opel Astra K 1.4 EcoTec (110 hp) CNG, produced from 2018 to July 2019, represented a unique offering within the broader Astra K range. This variant combined a conventional gasoline engine with a dedicated Compressed Natural Gas (CNG) system, aiming to provide a more environmentally friendly and economically viable option for European drivers. Positioned as a mid-range trim, it catered to buyers seeking lower running costs without sacrificing the practicality of a five-door hatchback. The Astra K itself was a significant model for Opel, representing a move towards lighter construction and more efficient powertrains, and this CNG variant further emphasized that commitment.
Technical Specifications
| Brand | Opel |
| Model | Astra |
| Generation | Astra K |
| Type (Engine) | 1.4 EcoTec (110 Hp) CNG |
| Start of production | 2018 |
| End of production | July, 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Hatchback |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 5.4 l/100 km (43.6 US mpg, 52.3 UK mpg, 18.5 km/l) |
| Fuel consumption (extra urban) | 3.3 l/100 km (71.3 US mpg, 85.6 UK mpg, 30.3 km/l) |
| Fuel consumption (combined) | 4.1 l/100 km (57.4 US mpg, 68.9 UK mpg, 24.4 km/l) |
| CO2 emissions | 113 g/km |
| Fuel Type | Petrol / CNG |
| Acceleration 0 – 100 km/h | 10.9 sec |
| Acceleration 0 – 62 mph | 10.9 sec |
| Acceleration 0 – 60 mph | 10.4 sec |
| Maximum speed | 195 km/h (121.17 mph) |
| Emission standard | Euro 6d-Temp |
| Weight-to-power ratio | 11.7 kg/Hp, 85.3 Hp/tonne |
| Weight-to-torque ratio | 6.4 kg/Nm, 155.2 Nm/tonne |
| Power | 110 Hp @ 5600 rpm |
| Power per litre | 78.6 Hp/l |
| Torque | 200 Nm @ 2000-3600 rpm (147.51 lb.-ft. @ 2000-3600 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | D14XNT |
| Engine displacement | 1399 cm3 (85.37 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 74 mm (2.91 in.) |
| Piston Stroke | 81.3 mm (3.2 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 4 |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 4 l (4.23 US qt | 3.52 UK qt) |
| Kerb Weight | 1289 kg (2841.76 lbs.) |
| Max. weight | 1890 kg (4166.74 lbs.) |
| Max load | 601 kg (1324.98 lbs.) |
| Trunk (boot) space – minimum | 370 l (13.07 cu. ft.) |
| Trunk (boot) space – maximum | 1210 l (42.73 cu. ft.) |
| Fuel tank capacity | 14 l (3.7 US gal | 3.08 UK gal) |
| CNG cylinder capacity | 13.4 kg |
| Permitted trailer load with brakes (12%) | 750 kg (1653.47 lbs.) |
| Permitted trailer load without brakes | 660 kg (1455.05 lbs.) |
| Length | 4370 mm (172.05 in.) |
| Width | 1809 mm (71.22 in.) |
| Width with mirrors folded | 1871 mm (73.66 in.) |
| Width including mirrors | 2042 mm (80.39 in.) |
| Height | 1485 mm (58.46 in.) |
| Wheelbase | 2662 mm (104.8 in.) |
| Front track | 1544 mm (60.79 in.) |
| Rear (Back) track | 1558 mm (61.34 in.) |
| Minimum turning circle | 11.05 m (36.25 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 | 6 gears, manual transmission |
| Front brakes | Disc |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 205/55 R16 |
| Wheel rims size | 6.5J x 16; 7J x 16 |
Powertrain & Engine Architecture
At the heart of the Astra K 1.4 EcoTec CNG lies the D14XNT engine, a 1.4-liter inline-four cylinder gasoline engine. This engine is part of Opel’s ‘EcoTec’ family, designed for efficiency and reduced emissions. The key difference, of course, is its bi-fuel capability, allowing it to run on either gasoline or Compressed Natural Gas (CNG). When running on CNG, the engine management system automatically switches fuel sources. The D14XNT utilizes multi-point fuel injection and a dual overhead camshaft (DOHC) valvetrain with four valves per cylinder. This configuration helps optimize breathing and contributes to the engine’s relatively responsive nature. The 110 hp output is achieved at 5600 rpm, while peak torque of 200 Nm (147.51 lb-ft) is available between 2000 and 3600 rpm. The engine is transversely mounted, driving the front wheels. The transmission is a six-speed manual gearbox, chosen for its efficiency and driver engagement. While an automatic transmission was available on other Astra K models, it wasn’t offered with the CNG variant.
Driving Characteristics
The Astra K 1.4 EcoTec CNG offers a driving experience that prioritizes economy over outright performance. The 110 hp output, while adequate for everyday driving, doesn’t provide particularly brisk acceleration. The 0-60 mph time of around 10.4 seconds reflects this. However, the engine’s torque delivery is reasonably strong in the mid-range, making it feel more responsive during overtaking maneuvers. The six-speed manual transmission is well-matched to the engine, allowing drivers to keep the engine in its optimal power band. Switching to CNG does result in a slight power reduction compared to running on gasoline, but the difference is generally not noticeable during normal driving. The suspension setup is typical for the Astra K, providing a comfortable ride quality without being overly sporty. The steering is precise and well-weighted, offering a good level of driver feedback.
Equipment & Trim Levels
The 1.4 EcoTec CNG trim generally included standard features such as air conditioning, power windows, a basic infotainment system with Bluetooth connectivity, and steel wheels with wheel covers. Safety features included ABS, ESP (Electronic Stability Program), and multiple airbags. Optional extras included alloy wheels, upgraded infotainment systems with touchscreen displays, parking sensors, and a panoramic sunroof. Interior upholstery was typically cloth, with a functional and durable design. The dashboard layout was consistent with other Astra K models, featuring a clean and modern design.
Chassis & Braking
The Astra K CNG utilizes a MacPherson strut front suspension and a torsion beam rear suspension. This setup provides a good balance between ride comfort and handling. The braking system consists of disc brakes on all four wheels, providing adequate stopping power for the vehicle’s weight and performance. ABS (Anti-lock Braking System) is standard, enhancing safety during emergency braking situations. The steering system is a rack-and-pinion type with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The Astra K 1.4 EcoTec CNG was generally well-received by critics as a practical and economical option. Its low running costs, thanks to the cheaper price of CNG compared to gasoline, were a major selling point. However, the limited availability of CNG refueling stations in some regions was a drawback. Compared to other Astra K variants, such as the 1.0-liter turbo or the 1.6-liter diesel, the CNG model offered a different proposition. The 1.0-liter turbo provided more spirited performance, while the 1.6-liter diesel offered even better fuel economy. The CNG variant appealed to drivers who prioritized environmental concerns and lower fuel bills.
Legacy
The Opel Astra K 1.4 EcoTec CNG represents a significant step in Opel’s efforts to offer alternative fuel vehicles. While CNG never achieved widespread adoption in many markets, the Astra K CNG demonstrated the viability of the technology. Today, these vehicles can be found on the used car market, often appealing to buyers seeking a cost-effective and environmentally conscious option. The D14XNT engine, when properly maintained, is generally considered to be a reliable unit. However, the CNG system itself requires periodic inspection and maintenance to ensure optimal performance and safety. The Astra K CNG remains a niche but interesting variant within the broader Astra K lineage.
