The Opel Astra F 1.8i (90 hp) Automatic, produced between October 1991 and July 1994, represented a key entry point into the Astra F range for buyers prioritizing comfort and ease of use over outright performance. Part of the first generation (Astra F, chassis code 1HX0/A3) of the Astra to be fully redesigned, it offered a more modern alternative to its predecessor, the Astra GTE. This variant was primarily aimed at family buyers and commuters seeking a reliable and affordable hatchback. It occupied the lower-mid range of the Astra F lineup, positioned below the more powerful 2.0-liter and GSi models, and above the base 1.4-liter versions.
Technical Specifications
| Brand | Opel |
| Model | Astra |
| Generation | Astra F |
| Type (Engine) | 1.8i (90 Hp) Automatic |
| Start of production | October, 1991 |
| End of production | July, 1994 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Hatchback |
| Seats | 5 |
| Doors | 3-5 |
| Fuel consumption (urban) | 9.7 l/100 km (24.2 US mpg, 29.1 UK mpg, 10.3 km/l) |
| Fuel consumption (extra urban) | 6.1 l/100 km (38.6 US mpg, 46.3 UK mpg, 16.4 km/l) |
| Fuel consumption (combined) | 7.7 l/100 km (30.5 US mpg, 36.7 UK mpg, 13 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 14.5 sec |
| Acceleration 0 – 62 mph | 14.5 sec |
| Acceleration 0 – 60 mph | 13.8 sec |
| Maximum speed | 173 km/h (107.5 mph) |
| Emission standard | Euro 1 |
| Weight-to-power ratio | 11.7 kg/Hp, 85.3 Hp/tonne |
| Weight-to-torque ratio | 7.3 kg/Nm, 137.4 Nm/tonne |
| Power | 90 Hp @ 5400 rpm |
| Power per litre | 50.1 Hp/l |
| Torque | 145 Nm @ 3000 rpm (106.95 lb.-ft. @ 3000 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | C18NZ |
| Engine displacement | 1796 cm3 (109.6 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 84.8 mm (3.34 in.) |
| Piston Stroke | 79.5 mm (3.13 in.) |
| Compression ratio | 9.2:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Single-point injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | SOHC |
| Engine oil capacity | 4 l (4.23 US qt | 3.52 UK qt) |
| Coolant | 6.9 l (7.29 US qt | 6.07 UK qt) |
| Kerb Weight | 1055/1075 kg (2325.88 lbs.) |
| Max. weight | 1580 kg (3483.3 lbs.) |
| Max load | 505-525 kg (1113.33 – 1157.43 lbs.) |
| Trunk (boot) space – minimum | 360 l (12.71 cu. ft.) |
| Trunk (boot) space – maximum | 1200 l (42.38 cu. ft.) |
| Fuel tank capacity | 52 l (13.74 US gal | 11.44 UK gal) |
| Length | 4051 mm (159.49 in.) |
| Width | 1688 mm (66.46 in.) |
| Width including mirrors | 1795 mm (70.67 in.) |
| Height | 1410 mm (55.51 in.) |
| Wheelbase | 2517 mm (99.09 in.) |
| Front track | 1424 mm (56.06 in.) |
| Rear (Back) track | 1423 mm (56.02 in.) |
| Ride height (ground clearance) | 135 mm (5.31 in.) |
| Drag coefficient (Cd) | 0.32 |
| Minimum turning circle | 10.5 m (34.45 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 | 4 gears, automatic transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Drum |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 175/65 R14 82T |
| Wheel rims size | 5.5J x 14 ET 49 |
Powertrain & Engine Architecture
The Astra F 1.8i Automatic was powered by the Opel C18NZ engine, an 1.8-liter inline-four cylinder gasoline engine. This engine featured a single-point fuel injection system (throttle body injection), a relatively simple and cost-effective technology for the time. The C18NZ utilized a single overhead camshaft (SOHC) valvetrain with two valves per cylinder. Its 90 horsepower output at 5400 rpm and 145 Nm (107 lb-ft) of torque at 3000 rpm were considered adequate for everyday driving, but not particularly sporty. The engine’s design prioritized fuel efficiency and reliability over high performance. The automatic transmission was a four-speed unit, offering smooth but not particularly quick shifts. It was designed to complement the engine’s torque curve, providing acceptable acceleration for typical commuting and highway driving.
Driving Characteristics
The 1.8i Automatic Astra F offered a comfortable and relaxed driving experience. Acceleration was noticeably slower than the manual transmission versions or those equipped with the 2.0-liter engine. The 0-60 mph time of around 13.8 seconds reflects this. The automatic transmission, while convenient, resulted in some power loss and a less engaging driving feel. Gear ratios were optimized for fuel economy and smooth cruising, rather than rapid acceleration. In real-world conditions, the car felt best suited for city driving and highway cruising, where the automatic transmission’s ease of use was most appreciated. Hill climbs and overtaking maneuvers required more planning and anticipation.
Equipment & Trim Levels
The 1.8i Automatic trim typically included features such as power steering, central locking, and a basic stereo system. Interior upholstery was usually cloth, with a relatively simple dashboard layout. Optional extras included electric windows, a sunroof, and upgraded audio systems. The trim level often dictated the quality of the cloth upholstery and the presence of additional convenience features. Compared to higher-spec Astra F models, the 1.8i Automatic generally had fewer standard features, reflecting its position as an entry-level or mid-range offering.
Chassis & Braking
The Astra F 1.8i Automatic featured a MacPherson strut front suspension and a torsion beam rear suspension. The braking system consisted of ventilated disc brakes on the front wheels and drum brakes on the rear. ABS (Anti-lock Braking System) was often included as standard equipment, enhancing safety. The suspension setup was tuned for comfort, providing a relatively smooth ride over uneven road surfaces. The rear drum brakes were a cost-saving measure, and while adequate for normal driving, they didn’t offer the same stopping power as disc brakes on all four wheels.
Market Reception & Comparison
The Astra F 1.8i Automatic was generally well-received as a practical and affordable family car. Critics praised its comfortable ride and ease of use, but noted its lack of sporting performance. Compared to the 2.0-liter and GSi models, the 1.8i Automatic offered significantly less power and a less engaging driving experience. However, it was more fuel-efficient and less expensive to purchase and maintain. The 1.4-liter versions were even more economical but lacked the 1.8’s adequate power for highway driving. The automatic transmission was a popular choice for buyers who prioritized convenience over performance.
Legacy
The Opel Astra F 1.8i Automatic, while not a performance icon, proved to be a reliable and durable vehicle. The C18NZ engine is known for its longevity, and the four-speed automatic transmission, while not cutting-edge, is generally robust. Today, these cars are relatively affordable on the used car market, making them attractive options for budget-conscious buyers. However, potential buyers should be aware of the age-related issues common to vehicles of this era, such as corrosion and wear and tear on suspension components. Parts availability is generally good, and the relatively simple mechanical design makes them relatively easy to maintain for those with some mechanical aptitude.
