The Mini Convertible (R52) Cooper 1.6i 16V, produced from 2005 to 2008, represented a significant expansion of the revived Mini brand. Following the success of the R50/R53 hardtop and hatchback, the R52 brought open-top motoring to the new Mini lineup. This variant, powered by the 1.6-liter naturally aspirated engine producing 116 horsepower, served as the entry point into the Convertible range, offering a more accessible price point and a focus on fuel efficiency compared to the supercharged Cooper S models. It was built on the BMW/MINI 1HX0/A3 platform, sharing many components with the contemporary Mini hatchback.
Technical Specifications
| Brand | Mini |
| Model | Convertible |
| Generation | Convertible (R52) |
| Type (Engine) | Cooper 1.6i 16V (116 Hp) |
| Start of production | 2005 |
| End of production | 2008 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 10.1 l/100 km (23.3 US mpg) |
| Fuel consumption (extra urban) | 5.7 l/100 km (41.3 US mpg) |
| Fuel consumption (combined) | 7.3 l/100 km (32.2 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 9.8 sec |
| Acceleration 0 – 62 mph | 9.8 sec |
| Acceleration 0 – 60 mph | 9.3 sec |
| Maximum speed | 193 km/h (119.92 mph) |
| Weight-to-power ratio | 10.8 kg/Hp |
| Weight-to-torque ratio | 8.3 kg/Nm |
| Power | 116 Hp @ 6000 rpm |
| Torque | 150 Nm @ 4500 rpm (110.63 lb.-ft. @ 4500 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | W10B16A |
| Engine displacement | 1598 cm3 (97.52 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 77 mm (3.03 in.) |
| Piston Stroke | 85.8 mm (3.38 in.) |
| Compression ratio | 10.6:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated |
| Valvetrain | DOHC |
| Engine oil capacity | 4.5 l (4.76 US qt | 3.96 UK qt) |
| Coolant capacity | 5.2 l (5.49 US qt | 4.58 UK qt) |
| Kerb Weight | 1250 kg (2755.78 lbs.) |
| Max. weight | 1575 kg (3472.28 lbs.) |
| Max load | 325 kg (716.5 lbs.) |
| Trunk (boot) space – minimum | 120 l (4.24 cu. ft.) |
| Trunk (boot) space – maximum | 605 l (21.37 cu. ft.) |
| Fuel tank capacity | 50 l (13.21 US gal | 11 UK gal) |
| Length | 3635 mm (143.11 in.) |
| Width | 1688 mm (66.46 in.) |
| Height | 1415 mm (55.71 in.) |
| Wheelbase | 2467 mm (97.13 in.) |
| Front track | 1458 mm (57.4 in.) |
| Rear track | 1466 mm (57.72 in.) |
| Drivetrain Architecture | Front wheel drive |
| Number of gears | 5 |
| Gearbox type | Manual transmission |
| Front suspension | Spring Strut |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 175/65 R15 |
| Wheel rims size | 5.5J x 15 |
Powertrain & Engine Architecture
The heart of the R52 Cooper Convertible was the W10B16A, a 1.6-liter inline-four cylinder engine. This engine, part of BMW’s Tritec engine family, featured a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. It utilized multi-port fuel injection, delivering fuel directly into the intake ports. The engine’s 10.6:1 compression ratio contributed to its respectable power output for its displacement. The engine was transversely mounted in the front of the vehicle, driving the front wheels. Paired with a 5-speed manual transmission, this engine provided a balance between performance and fuel economy. While an automatic transmission was available, it was a 6-speed unit and represented a slightly different driving experience.
Driving Characteristics
The 116 horsepower and 110.63 lb-ft of torque delivered by the 1.6-liter engine in the R52 Cooper Convertible provided adequate, though not exhilarating, performance. Acceleration from 0-60 mph took approximately 9.3 seconds, and the top speed was around 119.92 mph. The 5-speed manual transmission offered precise shifts, allowing drivers to make the most of the available power. Compared to the Cooper S models with their supercharged engines, the Cooper felt noticeably less powerful, particularly during overtaking maneuvers. However, the lighter weight of the naturally aspirated engine contributed to a more nimble and balanced feel, especially on winding roads. The gear ratios were tuned for everyday usability, prioritizing fuel efficiency and smooth cruising over outright acceleration.
Equipment & Trim Levels
The Cooper Convertible typically came standard with features like air conditioning, power windows, power locks, and an AM/FM stereo. Interior upholstery was typically cloth, with options for leather upgrades. Dashboard trim could be customized with various color and material choices. Popular optional extras included a sunroof, sport seats, alloy wheels, and a premium sound system. The Convertible also featured a fully automatic fabric roof, which could be lowered or raised electrically. Safety features included ABS brakes and front airbags.
Chassis & Braking
The R52 Convertible utilized a MacPherson strut front suspension and a multi-link coil spring rear suspension. This setup provided a comfortable ride while maintaining good handling characteristics. The front brakes were ventilated discs, offering strong stopping power, while the rear brakes were solid discs. The steering was a rack-and-pinion system, providing precise and responsive steering feel. The relatively lightweight construction of the R52, at around 2755.78 lbs, contributed to its agility.
Market Reception & Comparison
The Mini Convertible (R52) Cooper 1.6i 16V was generally well-received by automotive critics. It was praised for its stylish design, fun-to-drive character, and relatively affordable price point. However, some critics noted that the 1.6-liter engine felt underpowered, especially when compared to the Cooper S. Fuel economy was a strong point, with combined figures around 32.2 US mpg. Compared to other small convertibles on the market at the time, the Mini offered a unique blend of retro styling, modern technology, and engaging driving dynamics. The manual transmission version was generally preferred by enthusiasts for its more direct connection to the engine.
Legacy
The W10B16A engine, while not known for being exceptionally robust, proved to be reasonably reliable with proper maintenance. Common issues included oil leaks and occasional problems with the cooling system. Today, the R52 Cooper Convertible remains a popular choice in the used car market, particularly among those seeking a stylish and affordable open-top motoring experience. Parts availability is generally good, thanks to the Mini’s widespread popularity and BMW’s continued support. The R52 Cooper Convertible represents a key chapter in the revival of the Mini brand, successfully bringing the iconic nameplate into the 21st century.
