The Smart Fortwo II coupe (C451) 0.8 cdi, produced from 2007 to 2009, represents a significant iteration in the Smart city car lineage. Designed primarily for the European market, the Fortwo aimed to revolutionize urban mobility with its incredibly compact size and fuel efficiency. While never officially sold in large numbers in the United States, the Fortwo gained a niche following as a unique and economical transportation option. The C451 generation marked a substantial improvement over its predecessor, offering enhanced safety features, a more refined interior, and a wider range of engine options, including the 0.8-liter turbodiesel detailed here. This model specifically targeted drivers seeking minimal running costs and ease of parking in congested city environments.
Smart Fortwo II Coupe (C451) 0.8 cdi: An Overview
The Smart Fortwo, even in its second generation, remained a radical departure from conventional automotive design. Its diminutive footprint – barely over 10 feet long – allowed it to navigate tight urban spaces with unparalleled agility. The C451 model introduced a more mature aesthetic compared to the original Fortwo, with a slightly larger overall size and a more conventional dashboard layout. The 0.8 cdi variant, powered by a small-displacement turbodiesel engine, was particularly popular in Europe due to favorable tax incentives and its exceptional fuel economy. The car’s two-seater configuration and limited cargo space underscored its focus on individual urban commuting rather than family transport.
Engine & Performance
The heart of the Smart Fortwo II coupe 0.8 cdi is a 799cc inline three-cylinder diesel engine, designated OM 660.950. Despite its small size, the engine utilizes a turbocharger and intercooler to produce 45 horsepower. This translates to a power-to-liter ratio of 56.3 hp/l, a respectable figure for a diesel engine of this capacity. The engine’s key strength lies in its fuel efficiency. Combined fuel consumption is rated at just 3.3 liters per 100 kilometers (71.3 US mpg or 85.6 UK mpg), making it one of the most economical cars available during its production run. Power is delivered to the rear wheels via a five-speed manual transmission. While not designed for rapid acceleration, the Fortwo 0.8 cdi achieves a maximum speed of 135 km/h (83.89 mph). The weight-to-power ratio of 17.3 kg/Hp contributes to its surprisingly nimble handling, especially in city traffic. The diesel commonrail fuel injection system and OHC valvetrain contribute to efficient combustion and smooth operation.
Design & Features
The Smart Fortwo II coupe (C451) is instantly recognizable by its unique proportions. The coupe body style, with its two doors and two seats, emphasizes its minimalist design philosophy. The rear-engine, rear-wheel-drive layout is a defining characteristic, influencing both the car’s handling and its packaging. Safety features, while limited by the car’s size, were improved in the C451 generation. Anti-lock brakes (ABS) were standard, providing enhanced stopping power. The structural design incorporated a high-strength safety cell to protect occupants in the event of a collision. Interior features were basic but functional, focusing on providing a comfortable and practical driving experience. The trunk offers between 220 and 340 liters of storage space, depending on the rear seat configuration. The car’s small turning radius is a major asset in urban environments, allowing for effortless maneuvering in tight spaces.
Technical Specifications
| Brand | Smart |
| Model | Fortwo |
| Generation | Fortwo II coupe (C451) |
| Type (Engine) | 0.8 cdi (45 Hp) |
| Start of production | 2007 |
| End of production | 2009 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 2 |
| Doors | 2 |
| Fuel consumption (urban) | 3.4 l/100 km (69.2 US mpg, 83.1 UK mpg, 29.4 km/l) |
| Fuel consumption (extra urban) | 3.2 l/100 km (73.5 US mpg, 88.3 UK mpg, 31.3 km/l) |
| Fuel consumption (combined) | 3.3 l/100 km (71.3 US mpg, 85.6 UK mpg, 30.3 km/l) |
| Fuel Type | Diesel |
| Maximum speed | 135 km/h (83.89 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 17.3 kg/Hp |
| Power | 45 Hp |
| Power per litre | 56.3 Hp/l |
| Engine layout | Rear, Transverse |
| Engine Model/Code | OM 660.950 |
| Engine displacement | 799 cm3 (48.76 cu. in.) |
| Number of cylinders | 3 |
| Engine configuration | Inline |
| Cylinder Bore | 65.5 mm (2.58 in.) |
| Piston Stroke | 79 mm (3.11 in.) |
| Compression ratio | 18.5:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | OHC |
| Engine oil capacity | 2.7 l (2.85 US qt, 2.38 UK qt) |
| Kerb Weight | 780 kg (1719.61 lbs.) |
| Max. weight | 1050 kg (2314.85 lbs.) |
| Max load | 270 kg (595.25 lbs.) |
| Trunk (boot) space – minimum | 220 l (7.77 cu. ft.) |
| Trunk (boot) space – maximum | 340 l (12.01 cu. ft.) |
| Fuel tank capacity | 33 l (8.72 US gal, 7.26 UK gal) |
| Length | 2695 mm (106.1 in.) |
| Width | 1559 mm (61.38 in.) |
| Height | 1542 mm (60.71 in.) |
| Wheelbase | 1867 mm (73.5 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears and type of gearbox | 5 gears, manual transmission |
| Front brakes | Disc |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Tires size | 155/60 R15; 175/55 R15 |
The Smart Fortwo II coupe 0.8 cdi, while not a performance vehicle, offered a compelling package for urban dwellers prioritizing fuel efficiency, maneuverability, and a unique driving experience. Its impact lies in demonstrating the viability of ultra-compact cars and pushing the boundaries of automotive design in the pursuit of sustainable urban mobility.




