MINI One D | Part Three

MINI One D

 

Lightweight Engine, Heavyweight Performance

The compact four-cylinder engine is based on a Toyota development but has been further engineered by the BMW Group especially for use in the MINI One D.

This powerful 1.4 litre direct-injection diesel engine with second-generation common rail technology, turbocharger and intercooler achieves a maximum power output of 75 bhp at 4000 rpm. Its impressive maximum torque of 180 Nm is developed at just 2,000 rpm. This gives punchy acceleration and minimises the number of gear changes making it especially good for around town driving.

Top speed is 103 mph and 0-62 mph is reached in 13.8 seconds. Acceleration from 50-75 mph in fourth gear takes 12.3 seconds.

With a bore of 73 millimetres and piston stroke of 81.5 millimetres, engine displacement is 1364 cc. The compression ratio 18.5:1. The crankcase and cylinder head are made of aluminium giving the MINI One D a very respectable unladen weight of just 1175 kilos.

The MINI One D engine has four lightweight pistons that run in wear-proof cylinder liners made of grey cast-iron. The four valves per cylinder are operated by followers running on an overhead camshaft that controls the charge cycle. The camshaft is driven by the crankshaft via a maintenance-free timing chain.

Two independent poly-V-belts drive the servo pump on the hydraulic power steering and the ancillaries such as the alternator, water pump and air conditioning compressor. The damper at the front end of the crankshaft serves to absorb the inherent, characteristic vibrations and minimise the transmission of vibrations to the belt drive. The two mass flywheel acts very efficiently at damping typical diesel vibrations at low engine speed. This level of technology is usually only found in more powerful engines and rarely in small cars.

continues... | Part Four
Published 1 June 2003 Melanie Carter

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