MINI One D | Part Five

MINI One D

 

Quietly Does It

The MINI One D may attract attention from passers by but it certainly won’t be due to the noise it makes. In fact, it is almost impossible to distinguish from inside the cabin of the car whether the car is petrol or diesel. This achievement is due in the main part to the two-phase injection process that keeps the combustion process smooth and discreet. Noise is further reduced by sound deadening materials in the engine compartment.

An Economic Miracle

Depending on driving style, the MINI One D is able to cover over 600 miles on just one 50 litre tank of fuel, the equivalent of driving from the Isle of Skye to the Isle of Wight. Average fuel consumption in the combined cycle is 58.9 mpg with a CO2 emission of 129 g/km. In urban traffic the MINI One D records 48.7 mpg and in extra urban conditions 65.7 mpg. These figures prove the MINI One D can stand tall amongst in its peer group and also makes it the most fuel efficient car to be built by the BMW Group.

The extension of the first oil service interval to 15,000 miles (only 10,000 miles on petrol models) is also reason for applause. This has been made possible by the use of high performance oil and an oil level sensor that consistently monitors the amount of oil in the sump. In addition, the MINI One D has an oil/water heat exchanger that maintains well-balanced thermal conditions to prevent the engine oil from ageing prematurely.

Six Of The Best

The six-speed gearbox featured on the top of the range MINI Cooper S has been matched to the character and features of the MINI One D’s engine to produce optimum levels of performance and economy. The torque curve follows a smooth and muscular line but the close transmission ratios give it real agility when required. The sixth gear is effectively an overdrive gear, so that after the car has accelerated through the other five gears it can cruise along quietly, economically and comfortably.

As with all other MINIs, the gearbox follows a direct short-shifting pattern, integral to the car’s performance.

Fitting the ‘box’ was an engineering challenge due to the relative lack of space available beneath the engine, so the engineers selected a sophisticated space-saving transmission featuring three shafts. The smooth, quick and precise gear changes are produced by an equally sophisticated dual cone gearshift control where the shifts are transmitted to the gearbox via Bowden cables.

MINI One D - Latest Advances In Diesel Technology At A Glance
  • Four-cylinder diesel engine with injection for most efficient use of fuel
  • 100 per cent aluminium construction, reducing weight and ensuring optimum front axle loading
  • One of few diesels in its class to use second-generation common rail injection system (from Bosch). The second-generation system injects the fuel at a significantly higher pressure (1600 bars compared to 1350 bars with the first generation systems), and with up to four injections, combustion is quieter, cleaner and more efficient plus performance is improved
  • Turbocharger intercooled for more efficient use of the fuel’s latent energy
  • Dual mass flywheel in the transmission prevents engine vibrations being transmitted to the cabin, especially at the low revs at which diesel engines often operate
  • The oxidation catalytic converter built into the exhaust system means the car complies with the environmentally friendly EU 3 emission standard
  • Low-maintenance camshaft drive
  • Low-maintenance Poly-V belt drive
  • Oil/water heat exchanger
  • Oil change interval up to 15,000 miles (according to driving style and service interval display)
continues... | Part Six
Published 1 June 2003 Melanie Carter

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