The Alfa Romeo 159 Sportwagon: Engines And Transmissions | Part Three

2.2 JTS Petrol Engine
  • 2198 cc
  • 4-cylinders, 16 valves
  • Power: 185 bhp @ 6500 rpm
  • Torque: 170 lb ft @ 4500 rpm
  • Timing gear: DOHC, continuous dual VVT
  • Transmission: 6-speed manual
  • Top speed: 137 mph
  • Acceleration 0-62 mph: 9.0 seconds
  • Fuel consumption: in town: 21.4 mpg out of town: 38.7 mpg combined: 29.7 mpg
  • CO2: 224 g/km
1.9 JTS Petrol Engine
  • 1859 cc
  • 4-cylinders, 16 valves
  • Power: 160 bhp @ 6500 rpm
  • Torque: 140 lb ft @ 4500 rpm
  • Timing gear: DOHC, continuous dual VVT
  • Transmission:6-speed manual
  • Top speed: 130 mph
  • Acceleration 0-62 mph: 9.9 seconds
  • Fuel consumption: in town: 22.8 mpg out of town: 42.2 mpg combined: 32.1 mpg
  • CO2: 209 g/km

Both 2.2 and 1.9 litre versions of the 4-cylinder Alfa Romeo JTS powerplant feature aluminium cylinder heads, blocks and crankcases, effecting a weight reduction of some 20% over the units they replace.

Both engines also adopt ‘Twin Phaser’ continuously variable valve timing. In addition, they feature low friction, maintenance-free chain drive to the camshafts and water pump, and are further equipped with a dual detonation sensor to improve sensitivity to engine knock, enhancing maximum performance.

Mated to an M32.6 6-speed manual transmission, the Euro 4 compliant 1.9 and 2.2 litre units develop 160 and 185bhp at 6500rpm, and 140 and 170lb ft of torque at 4500rpm respectively. These high power outputs require the use of sodium cooled exhaust valves. The 159 2.2 JTS will accelerate from 0-62mph in just 9.0 seconds, and still return almost 30mpg (Combined).

2.4 JTDM 20v Diesel Engine
  • 2387 cc
  • 5-cylinders, 20 valves
  • Power: 200 bhp @ 4000 rpm
  • Torque: 295 lb ft @ 2000 rpm
  • Timing gear: DOHC
  • Transmission: 6-speed manual
  • Top speed: 140 mph
  • Acceleration 0-62 mph: 8.6 seconds
  • Fuel consumption: in town: 30.1 mpg out of town: 50.4 mpg combined: 40.4 mpg
  • CO2: 184 g/km

Alfa Romeo was first to the market with a JTD Common Rail direct injection diesel engine when the Alfa 156 was launched in 1997. This crucial lead in diesel technology has not been squandered and, in its latest 20 valve MultiJet guise, the new 5-cylinder 2.4 litre unit is the most powerful engine in the Alfa Romeo JTDM family, with a specific power output of 84bhp/litre.

MultiJet Technology

Within a UniJet engine, a pilot injection raises temperature and pressure inside the cylinder to improve combustion at the time of the main stroke. However, by dividing the main injection into a number of smaller injections, a MultiJet engine affords a fuller, more gradual combustion whilst the amount of diesel burnt at each stroke remains the same; thus facilitating smoother, quieter combustion, reduced emissions and increased performance.

However, a MultiJet engine differs from its UniJet counterpart in two essential areas; the injectors and the electronic control unit.

To facilitate multi-injection, the new injectors can both reduce the time lag between injections from 1500 to just 150 microseconds, and reduce the minimum quantity of fuel injected from 2 to less than 1 cu mm. In tandem, the new control unit modulates injection strategy continually to adjust to changes within three parameters; engine rpm, torque required at any given time by the driver, and coolant temperatures.

continues... | Part Four
Published 6 June 2006 Melanie Carter

The information contained this Alfa Romeo 159 news article may have changed since publication on the 6 June 2006. Our car specifications, reviews, and prices may only apply to the UK market. You may wish to check with the manufacturer or your local Alfa Romeo dealer, before making a purchasing decision. E.&.O.E. You may NOT reproduce our car news in full or part, in any format without our written permission. © 2018