Two new five-cylinder diesels from Volvo: More power and less fuel consumption
Volvo Cars is introduced two entirely new five-cylinder, 2.4-litre turbodiesel engines at the Geneva Motor Show to give the customers the attractive possibility to combine more power with class-leading fuel consumption and CO2 emissions.
The new high-performance, twin-turbo D5 with 150 kW and 420 Nm of torque will be available in South Africa in the third quarter of 2009 in the refreshed Volvo S80 and in the Volvo XC60 and XC70.
Volvo Car South Africa is also considering the introduction at a later stage of the single-turbo 2.4D that has been optimised with low fuel consumption in sharp focus. This engine delivers 130 kW and 420 Nm of torque.
“The introduction of the new engines is yet another step in our determination to reduce the combustion engine’s environmental impact, at the same time as we give customers truly quiet and sophisticated engines with excellent performance,” says Derek Crabb, vice president for powertrain engineering at Volvo Cars.
The performance and driveability requirements in the high-performance D5 engine have been solved with twin turbochargers of different sizes that operate in sequence to provide added power within a broader rev range. The result is alert response and rapid acceleration at all speeds, with very smooth power delivery between the turbo ranges.
This twin-turbo technology in the D5 has also made it possible to introduce higher levels of exhaust gas recirculation (EGR) across a wider rev range than before. This harnesses the two turbochargers’ different properties optimally to deliver a combination of high performance and low fuel consumption that is bidding for the title of best in class.
The advanced fuel injection technology uses piezoelectric fuel injectors. This provides precise distribution of the atomised fuel in the combustion chamber, resulting in efficient combustion and low emissions. At the same time, this technology and the efficient combustion create a pleasant sound bearing a closer resemblance to the elegant note of a six-cylinder petrol engine.
Together, the high-tech solutions contribute to the excellent fuel consumption figures (in an EU combined test cycle):
6.2 litres/100 km (164 g/km) in the S80.
7.0 litres/100 km (185 g/km) in the XC60 (preliminary).
7.0 litres/100 km (185 g/km) in the XC70 (preliminary).
Single-turbo 2.4D – focus on fuel economy
In overseas markets the single-turbo 2.4D will be available from the second quarter of 2009 in the Volvo S80 and Volvo V70 as well as in front-wheel-drive versions of the Volvo XC60 and Volvo XC70.
The engine has been optimised to achieve very low fuel consumption. The injection system features another type of piezoelectric fuel injectors than in the D5, aiming to cut fuel consumption through extremely rapid and precise injection sequences. The high injection pressure results in particularly effective combustion.
To promote the drivability, the single turbocharger has been optimised to produce high torque from low revs.
The upgraded single-turbo 2.4D-engine gives a fuel consumption (in an EU combined test cycle) of:
5.8 litres/100 km (154 g/km) in the S80 (preliminary).
6.0 litres/100 km (159 g/km) in the XC60.
6.0 litres/100 km (159 g/km) in the XC70.
The two new diesel engines share a number of technology solutions. The engines have lower compression, more efficient combustion and the latest generation of engine management. Volvo Cars’ powertrain experts have reduced internal friction and pump losses in the diesel engines. The pressure drop in the intake and exhaust system has also been significantly reduced.
The new turbodiesels have also been equipped with ceramic glow plugs that delivers excellent starting properties due to very quick warming up. They reach a temperature of 1 000 degrees Celsius in just two seconds, making the engine easy to start and cutting emissions. In certain driving conditions, such as at really low revs, the ceramic glow-plugs can also be used to increase the temperature in the cylinders, further improving combustion efficiency.