Technical Specifications
| Brand | Opel |
| Model | Astra |
| Generation | Astra H |
| Type (Engine) | 1.8i 16V (125 Hp) |
| Start of production | 2004 |
| End of production | 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Hatchback |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 10.5 l/100 km (22.4 US mpg, 26.9 UK mpg, 9.5 km/l) |
| Fuel consumption (extra urban) | 6.2 l/100 km (37.9 US mpg, 45.6 UK mpg, 16.1 km/l) |
| Fuel consumption (combined) | 7.8 l/100 km (30.2 US mpg, 36.2 UK mpg, 12.8 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 10.8 sec |
| Acceleration 0 – 62 mph | 10.8 sec |
| Acceleration 0 – 60 mph | 10.3 sec |
| Maximum speed | 198 km/h (123.03 mph) |
| Weight-to-power ratio | 10.2 kg/Hp, 97.8 Hp/tonne |
| Weight-to-torque ratio | 7.5 kg/Nm, 133 Nm/tonne |
| Power | 125 Hp @ 5600 rpm |
| Power per litre | 69.6 Hp/l |
| Torque | 170 Nm @ 3800 rpm (125.39 lb.-ft. @ 3800 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | Z18XE |
| Engine displacement | 1796 cm3 (109.6 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 80.5 mm (3.17 in.) |
| Piston Stroke | 88.2 mm (3.47 in.) |
| Compression ratio | 10.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 4.25 l (4.49 US qt | 3.74 UK qt) |
| Coolant | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Kerb Weight | 1278 kg (2817.51 lbs.) |
| Max. weight | 1760 kg (3880.14 lbs.) |
| Max load | 482 kg (1062.63 lbs.) |
| Trunk (boot) space – minimum | 380 l (13.42 cu. ft.) |
| Trunk (boot) space – maximum | 1330 l (46.97 cu. ft.) |
| Fuel tank capacity | 52 l (13.74 US gal | 11.44 UK gal) |
| Length | 4249 mm (167.28 in.) |
| Width | 1753 mm (69.02 in.) |
| Width including mirrors | 2033 mm (80.04 in.) |
| Height | 1467 mm (57.76 in.) |
| Wheelbase | 2614 mm (102.91 in.) |
| Front track | 1488 mm (58.58 in.) |
| Rear (Back) track | 1488 mm (58.58 in.) |
| Front overhang | 871 mm (34.29 in.) |
| Rear overhang | 764 mm (30.08 in.) |
| Ride height (ground clearance) | 160 mm (6.3 in.) |
| Drag coefficient (Cd) | 0.32 |
| 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 suspension | Spring Strut |
| Rear suspension | Spring Strut |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 195/65 R15 |
| Wheel rims size | 6.5J x 15 |
The Opel Astra H 1.8i 16V, produced between 2004 and 2006, occupied a significant position as a mid-range offering within the broader Astra H (2004-2009) generation. Designed as a practical and relatively affordable option, this variant aimed to strike a balance between performance and fuel efficiency, appealing to a broad spectrum of European drivers. The Astra H itself was a crucial model for Opel, building upon the success of its predecessor and introducing a more refined interior and improved ride quality. This particular 1.8-liter engine and five-speed manual transmission combination was a popular choice, offering a step up in power from the base 1.4-liter models while remaining more accessible than the higher-performance variants. It was a key competitor in the highly competitive C-segment hatchback market.
Powertrain & Engine Architecture
The core of the Astra H 1.8i 16V is the Z18XE engine, a naturally aspirated, four-cylinder inline engine with a displacement of 1796cc. This engine is part of Opel’s ‘Ecotec’ family, renowned for its emphasis on efficiency and refinement. The Z18XE employs multi-port fuel injection, delivering fuel directly into the intake ports, and a double overhead camshaft (DOHC) valvetrain, optimizing airflow for enhanced performance. The engine’s 16 valves (four per cylinder) further contribute to its breathing efficiency. It produces 125 horsepower at 5600 rpm and 170 Nm (125 lb-ft) of torque at 3800 rpm. The five-speed manual transmission was the most common pairing, providing a balance between fuel economy and driver engagement. The transmission featured gear ratios typical for a front-wheel-drive hatchback, prioritizing acceleration in the lower gears and comfortable cruising at highway speeds.
Driving Characteristics
The 1.8i 16V Astra H delivered a noticeably more spirited driving experience compared to the base 1.4-liter models. While not designed for outright performance, the 125 hp engine provided sufficient power for everyday driving and occasional highway overtaking. Acceleration from 0 to 60 mph took approximately 10.3 seconds, and the car could achieve a top speed of 198 km/h (123 mph). The five-speed manual transmission allowed drivers to effectively utilize the engine’s powerband, although the gearing wasn’t particularly sporty. In comparison to the 1.9 CDTi diesel variants, the 1.8i offered less torque but a more responsive and linear power delivery. The diesel models excelled in fuel economy, while the 1.8i prioritized a smoother, more refined driving experience.
Equipment & Trim Levels
The Astra H 1.8i 16V was typically offered in mid-range trim levels, such as ‘Enjoy’ or ‘Cosmo’ depending on the specific market. Standard equipment generally included air conditioning, power windows, central locking, and an integrated radio/CD player. Higher trim levels added features like alloy wheels, fog lights, cruise control, and upgraded interior upholstery. Optional extras included a sunroof, parking sensors, and a more sophisticated audio system. Interior materials were generally of good quality for the price point, with a focus on durability and practicality. The dashboard layout was functional and user-friendly, with logically arranged controls.
Chassis & Braking
The Astra H utilized a MacPherson strut suspension setup at the front and a torsion beam suspension at the rear. This configuration provided a good compromise between ride comfort and handling. The front brakes were ventilated discs, offering good stopping power, while the rear brakes were solid discs. Anti-lock Braking System (ABS) was standard, enhancing safety during emergency braking. The steering was a rack and pinion system, providing precise and responsive control. The 1.8i models typically featured slightly stiffer suspension components compared to the base models, improving handling and reducing body roll.
Market Reception & Comparison
The Astra H 1.8i 16V was generally well-received by automotive critics as a competent and practical hatchback. It was praised for its comfortable ride, refined engine, and reasonable fuel economy. However, some critics noted that the engine lacked the punch of its turbocharged counterparts. Compared to competitors like the Ford Focus and Volkswagen Golf, the Astra H offered a competitive package in terms of price, features, and driving dynamics. The 1.8i variant presented a compelling alternative to the diesel models for drivers who preferred the smoothness and responsiveness of a gasoline engine.
Legacy
The Z18XE engine, while not particularly innovative, proved to be a reliable and durable unit. Astra H models equipped with this engine and the five-speed manual transmission are still relatively common in the used car market today. Maintenance costs are generally reasonable, and parts availability remains good. However, as with any older vehicle, potential buyers should be aware of potential issues such as oil leaks and wear on suspension components. The Astra H 1.8i 16V continues to be a practical and affordable option for those seeking a dependable and fuel-efficient hatchback.
