The Mercedes-Benz R107 generation SL, produced from 1971 to 1989, represented a significant evolution for the iconic roadster. The 450 SL V8, specifically manufactured from November 1975 to November 1980, occupied a premium position within the lineup, offering a substantial increase in performance over the earlier six-cylinder models. This variant was aimed at buyers seeking a blend of luxury, performance, and the prestige associated with a Mercedes-Benz V8 engine. It served as a bridge between the more economical SL models and the eventual, more powerful 560 SL.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | SL |
| Generation | SL (R107) |
| Type (Engine) | 450 SL V8 (217 Hp) Automatic |
| Start of production | November, 1975 |
| End of production | November, 1980 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Roadster |
| Seats | 2 |
| Doors | 2 |
| Fuel consumption (combined) | 14.5 l/100 km (16.2 US mpg, 19.5 UK mpg, 6.9 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 9.3 sec |
| Acceleration 0 – 62 mph | 9.3 sec |
| Acceleration 0 – 60 mph | 8.8 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Weight-to-power ratio | 7.3 kg/Hp, 137.3 Hp/tonne |
| Weight-to-torque ratio | 4.4 kg/Nm, 227.8 Nm/tonne |
| Power | 217 Hp @ 5000 rpm |
| Power per litre | 48 Hp/l |
| Torque | 360 Nm @ 3250 rpm (265.52 lb.-ft. @ 3250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 117 E 45 / 117.985 |
| Engine displacement | 4520 cm3 (275.83 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 92 mm (3.62 in.) |
| Piston Stroke | 85 mm (3.35 in.) |
| Compression ratio | 8.8:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | SOHC |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant | 15 l (15.85 US qt | 13.2 UK qt) |
| Kerb Weight | 1580 kg (3483.3 lbs.) |
| Max. weight | 2000 kg (4409.25 lbs.) |
| Max load | 420 kg (925.94 lbs.) |
| Fuel tank capacity | 90 l (23.78 US gal | 19.8 UK gal) |
| Length | 4390 mm (172.83 in.) |
| Width | 1790 mm (70.47 in.) |
| Height | 1300 mm (51.18 in.) |
| Wheelbase | 2455 mm (96.65 in.) |
| Front track | 1452 mm (57.17 in.) |
| Rear (Back) track | 1440 mm (56.69 in.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 3 gears, automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Threaded twist beam |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic Steering |
| Tires size | Front wheel tires: 205/70 R14 Rear wheel tires: 205/70 R14 |
| Wheel rims size | Front wheel rims: 6.5J x 14 Rear wheel rims: 6.5J x 14 |
INTRODUCTION
The Mercedes-Benz 450 SL V8, built between 1975 and 1980, was a pivotal model in the R107 SL series. The R107, designed as a successor to the popular W113 “Pagoda” SL, aimed to combine the classic roadster experience with modern comfort and safety features. The introduction of the 450 SL marked a significant upgrade in performance, moving away from the earlier six-cylinder engines and establishing the V8 as the premium engine choice. This model was primarily marketed towards North America and Europe, offering a luxurious and capable grand tourer experience.
Powertrain & Engine Architecture
At the heart of the 450 SL lies the M117 E 45 V8 engine. This 4.5-liter (4520 cc) engine, a cornerstone of Mercedes-Benz’s engineering during the 1970s, featured a single overhead camshaft (SOHC) design with two valves per cylinder. The engine utilized Bosch K-Jetronic multi-port fuel injection, a sophisticated system for its time, providing precise fuel delivery and contributing to smooth operation. The M117 engine was known for its robust construction and relatively simple design, enhancing reliability. The 450 SL was exclusively paired with a three-speed automatic transmission, designed to deliver comfortable and effortless cruising. This transmission, while not offering the driver engagement of a manual, was well-suited to the car’s grand touring character. The engine code 117.985 is specific to this configuration.
Driving Characteristics
The 450 SL Automatic offered a distinctly different driving experience compared to the six-cylinder SL models or the later 560 SL. While the 217 horsepower and 265 lb-ft of torque provided ample power for comfortable highway cruising and spirited driving, the three-speed automatic transmission meant that acceleration wasn’t as brisk as the manual-equipped versions. The automatic’s gear ratios were optimized for relaxed touring rather than outright performance. The car felt substantial and planted on the road, thanks to its relatively heavy weight and well-tuned suspension. The steering, while hydraulic, lacked the directness of more modern systems, requiring a deliberate input. Overall, the 450 SL Automatic prioritized comfort and ease of use over sporty handling.
Equipment & Trim Levels
The 450 SL V8 was positioned as a well-equipped luxury roadster. Standard features included leather upholstery, power windows, central locking, and a high-quality sound system. The interior design was characterized by its elegant simplicity and durable materials. Optional extras included air conditioning (a very popular option), cruise control, and a sunroof. The dashboard layout was functional and driver-focused, with clearly marked gauges and controls. The exterior trim typically featured chrome accents, adding to the car’s luxurious appearance. The standard wheels were 6.5J x 14 inch alloy wheels, though other styles were available as options.
Chassis & Braking
The R107 SL chassis was a robust monocoque construction, providing a solid foundation for the car’s handling and safety. The front suspension utilized double wishbones, while the rear employed a threaded twist beam axle. This suspension setup provided a comfortable ride, although it wasn’t particularly sporty. The 450 SL was equipped with ventilated disc brakes at the front and solid disc brakes at the rear, providing adequate stopping power for the car’s weight and performance. Power steering was standard, making the car easier to maneuver at low speeds. The car’s weight distribution was relatively balanced, contributing to its stable handling characteristics.
Market Reception & Comparison
The 450 SL V8 was generally well-received by automotive critics. It was praised for its smooth engine, comfortable ride, and luxurious interior. However, some critics noted that the automatic transmission detracted from the driving experience and that the car’s weight made it feel less agile than some of its competitors. Compared to the six-cylinder SL models, the 450 SL offered a significant performance upgrade, but at a higher price point. Compared to the later 560 SL, the 450 SL offered a slightly more manageable power output and potentially better long-term reliability, as the 560 SL’s larger engine was more prone to overheating issues. Fuel economy, at 16.2 US mpg, was typical for a V8-powered car of that era, but it was considerably lower than the six-cylinder models.
Legacy
The Mercedes-Benz 450 SL V8 has become a sought-after classic car, appreciated for its timeless design, robust engineering, and comfortable driving experience. The M117 V8 engine is known for its durability and relatively simple maintenance requirements, making it a reliable powerplant. However, like all classic Mercedes-Benz models, the 450 SL requires regular maintenance to prevent issues such as corrosion and rubber component degradation. Today, well-maintained examples command strong prices in the used car market, appealing to collectors and enthusiasts alike. The 450 SL represents a high point in Mercedes-Benz roadster design, offering a blend of luxury, performance, and enduring style.
