new diesel engine!
140 BHP 1.9 JTD 16V
Alfa Romeo has chosen the Paris International Motor Show as the venue for
displaying a unique direct injection petrol unit and also for the world
premiere of its brand new 140 bhp 1.9 JTD 16 valve power unit coupled with a
sporty 6-speed manual gearbox.
This four-cylinder in-line unit offers a bore of 82 mm and stroke of 90.4 mm.
It is derived from the tried and tested 1.9 JTD 8 valve Common Rail unit but
offers 20% more power and 7% more torque than the original. The four valves per
cylinder are driven directly by a twin overhead camshaft. The new turbodiesel
is available on the 147, 156 and Sportwagon and has undergone several technical
improvements to increase performance, engine torque at low speeds and noise
levels while also reducing vibrations.
The Common Rail system used on the 1.9 JTD 16v unit includes two new strategies
for automatically calibrating and balancing the diesel injected to lower noise
and reduce vibration. In any case, this power unit is a Multijet, i.e. it uses
electronic injector control to make more injections than the current number of
two during each engine cycle. This facility, developed in the Fiat Research
Centre, means that the main injection can be divided into two, three or four
smaller injections. All this means better control of combustion noise, reduced
emissions and increased performance.
Some parts of the 1.9 JTD 16v are also brand new: a cylinder head with
hydraulic tappets, steel connecting rods and crankshaft, a piston with an
internal channel to carry cooling oil to the main bearings and connecting rod
bearings that are made out of different material to the previous unit. The
exhaust and intake manifolds are also new: the former is made out of a special
high-strength material while the latter is made out of pressure cast aluminium.
The lubrication circuit also comes with a new oil pump and a different external
exchanger (air/oil) for cooling the oil. The cooling circuit water pump is also
new. This long series of improvements and changes have created a reliable,
powerful engine with low fuel consumption.
Compared to the 8-valve unit, for example, the new turbodiesel offers more
power (20%), increased from 85 to 103 kW at 4000 rpm and more torque (7%),
increased from 28 to 31 kgm at 2000 rpm.
These results have been achieved by adopting a new engine setting, increasing
the direct injection pressure to 1400 bars and introducing a new turbocharger
setting. The power units are turbocharged via a Garrett turbocharger with
variable geometry turbine that helps improve power delivery by allowing very
high torque delivery even at low rpms. Suffice it to say that 90% of maximum
torque is available between 1750 and 3250 rpm.
These statistics add up to a more satisfying drive plus a significant increase
in the performance achieved on the Alfa 147 and also the Alfa 156 and
This is borne out by the pick-up times for an Alfa 147 equipped with a 1.9JTD
16v in 5th gear: the car speeds from 80 to 120 km/h in just 7.9 seconds, while
the 8 valve unit took 9.8 seconds. The Alfa 156 accelerates from 80 to 120 in
7.9 seconds compared to 9.9 for the 8-valve version.
Needless to say, the Alfa 147 1.9 JTD 16v reaches a top speed of 206 km/h and
accelerates from 0 to 100 km/h in 9.1 seconds (the corresponding figures for
the 8 valve version are 191 and 10.5 seconds) though fuel consumption is
unaltered. If anything, the fuel consumption figures are slightly lower. At
constant speed in 6th gear, the model returns the following results:
4.5 l/100 km at 90 km/h (8% lower than the 8 valve unit);
6.0 l/100 km at 120 km/h (8% lower than the 8 valve unit);
7.5 l/100 km at 150 km/h (10% lower than the 8 valve unit);
The Alfa 156 can also reach a speed of 209 km/h and accelerate from 0 to 100
km/h in 9.3 seconds (the Sportwagon takes 9.7 seconds to accelerate from 0 to
100 km/h). In this case too, fuel consumption figures are lower than for
versions equipped with the 8 valve engine. At constant speed in 6th gear, the
model returns the following results:
4.2 l/100 km at 90 km/h (12.5% lower than the 8 valve unit);
5.5 l/100 km at 120 km/h (8% lower than the 8 valve unit);
7.2 l/100 km at 150 km/h (7.5% lower than the 8 valve unit).
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