The Opel Manta B 1.8 S (90 hp) was a variant of the Manta B model produced between 1981 and 1982. Positioned as an entry-level to mid-range offering within the Manta B lineup, it provided a more affordable and fuel-conscious alternative to the higher-performance models like the Manta GT/E. The Manta B, launched in 1978, represented a significant redesign of the original Manta A, adopting a more angular and modern aesthetic. This generation of Manta aimed to blend sporty styling with everyday practicality, appealing to a broad customer base in Europe.
Technical Specifications
| Brand | Opel |
| Model | Manta |
| Generation | Manta B |
| Type (Engine) | 1.8 S (90 Hp) |
| Start of production | 1981 |
| End of production | 1982 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 11.5 sec |
| Acceleration 0 – 62 mph | 11.5 sec |
| Acceleration 0 – 60 mph | 10.9 sec |
| Maximum speed | 175 km/h (108.74 mph) |
| Weight-to-power ratio | 11.1 kg/Hp, 90 Hp/tonne |
| Weight-to-torque ratio | 7 kg/Nm, 143 Nm/tonne |
| Power | 90 Hp @ 5400 rpm |
| Power per litre | 50.1 Hp/l |
| Torque | 143 Nm @ 3000-3400 rpm (105.47 lb.-ft. @ 3000-3400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | 18S |
| 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 | Carburettor |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | SOHC |
| Engine oil capacity | 3.75 l (3.96 US qt | 3.3 UK qt) |
| Coolant | 6.8 l (7.19 US qt | 5.98 UK qt) |
| Kerb Weight | 1000 kg (2204.62 lbs.) |
| Max. weight | 1380 kg (3042.38 lbs.) |
| Max load | 380 kg (837.76 lbs.) |
| Trunk (boot) space – minimum | 380 l (13.42 cu. ft.) |
| Fuel tank capacity | 50 l (13.21 US gal | 11 UK gal) |
| Permitted trailer load with brakes (12%) | 1200 kg (2645.55 lbs.) |
| Length | 4443 mm (174.92 in.) |
| Width | 1686 mm (66.38 in.) |
| Height | 1330 mm (52.36 in.) |
| Wheelbase | 2518 mm (99.13 in.) |
| Front track | 1380 mm (54.33 in.) |
| Rear (Back) track | 1375 mm (54.13 in.) |
| Minimum turning circle (turning diameter) | 10.5 m (34.45 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears and type of gearbox | 4 gears, manual transmission |
| Front brakes | Disc |
| Rear brakes | Drum |
| Tires size | 185/70 R13 |
| Wheel rims size | 13 |
Powertrain & Engine Architecture
The 1.8 S variant was powered by the Opel 18S engine, a 1796 cc inline-four cylinder unit. This engine utilized a single overhead camshaft (SOHC) valvetrain with two valves per cylinder. Fuel delivery was managed by a carburetor, a common feature for the time, offering simplicity and relatively low cost. The engine produced 90 horsepower at 5400 rpm and 143 Nm (105.47 lb-ft) of torque between 3000 and 3400 rpm. The engine was mounted longitudinally in the front of the vehicle, driving the rear wheels. The transmission was a four-speed manual gearbox, providing a relatively simple and robust drivetrain. The 18S engine code signifies a specific calibration of the engine, optimized for fuel efficiency and everyday usability rather than outright performance.
Driving Characteristics
The 1.8 S offered a comfortable and predictable driving experience. Acceleration from 0 to 60 mph took approximately 10.9 seconds, and it had a top speed of around 108.74 mph. Compared to the more powerful Manta GT/E with its fuel injection and higher compression ratio, the 1.8 S felt noticeably less responsive. The carburetor setup resulted in a slight delay in throttle response, and the lower horsepower meant that overtaking required more planning. However, the 1.8 S’s more relaxed power delivery made it easier to drive in urban environments and on long journeys. The four-speed manual transmission provided adequate gear spacing, but the gear ratios were geared towards fuel economy rather than spirited driving. The rear-wheel-drive configuration provided a balanced feel, although it lacked the handling precision of more modern vehicles.
Equipment & Trim Levels
The 1.8 S trim level typically included basic features such as cloth upholstery, vinyl flooring, and a simple dashboard layout. Standard equipment often included a basic AM/FM radio, heater, and manual windows. Optional extras could include a sunroof, upgraded stereo system, and more comfortable seats. The interior was functional and durable, reflecting the car’s focus on affordability. The exterior styling was generally consistent across the Manta B range, with the 1.8 S often featuring steel wheels and basic trim details. The overall aesthetic was sporty and modern for its time, with a distinctive fastback coupe silhouette.
Chassis & Braking
The Manta B 1.8 S utilized a relatively simple chassis design. The front suspension consisted of MacPherson struts, while the rear suspension employed a solid axle with leaf springs. This setup provided a comfortable ride but wasn’t particularly sophisticated in terms of handling. The braking system featured disc brakes on the front wheels and drum brakes on the rear. This configuration was typical for cars in this price range during the early 1980s. The braking performance was adequate for everyday driving, but it lacked the stopping power and fade resistance of more advanced braking systems. The car’s weight of around 2204.62 lbs contributed to its manageable handling characteristics.
Market Reception & Comparison
The Opel Manta B 1.8 S was generally well-received as an affordable and practical coupe. Critics praised its stylish design and comfortable ride, but noted its lack of outright performance compared to the higher-spec models. Fuel economy was a strong point, making it an attractive option for drivers seeking a sporty-looking car without excessive running costs. Compared to the Manta GT/E, the 1.8 S offered a significant price advantage, but at the cost of performance and refinement. The 1.8 S also competed with other coupes in the European market, such as the Ford Taunus Coupe and the Volkswagen Scirocco, offering a similar blend of style, practicality, and affordability.
Legacy
The Opel Manta B 1.8 S, while not the most powerful or technologically advanced version of the Manta B, remains a popular classic car among enthusiasts. The 18S engine is known for its reliability and relative simplicity, making it relatively easy to maintain. However, finding parts can be challenging as the car is now several decades old. Today, the Manta B 1.8 S is often sought after as an affordable entry point into classic Opel ownership, offering a nostalgic driving experience and a distinctive 1980s aesthetic. Its enduring appeal lies in its blend of style, practicality, and affordability, making it a cherished piece of automotive history.
