Featuring two new turbo-diesel engines -- an all-new twin-turbo five-cylinder and a single-turbo four-cylinder -- Volvo now offers an economical, low emissions diesel option for every vehicle in next year's range, excluding XC90.
Volvo D5 Engine
The new 2.4-litre twin-turbo D5 engine has, except for its designation and in-line five-cylinder configuration, no relationship with the previous unit.
Available in XC60, XC70 and S80, the new D5 engine is mated as standard to a six-speed adaptive Geartronic transmission, driving all wheels via a Haldex All Wheel Drive system.
The modular all-aluminium engine was developed in-house over a period just short of three years. The long-stroke, double overhead camshaft unit features four valves per cylinder (two inlet, two outlet) and has a compression ratio of 16.5:1.
Utilising a sequentially arranged twin-turbocharged induction system, the D5 provides extremely high boost pressures, up to 1.8bar, across a wider rev range for more linear power delivery.
The twin-turbo arrangement also increases the efficiency of the exhaust gas recirculation system, reducing the temperature of recirculated gases which in turn helps lower N20 emissions.
The new D5 engine features piezoelectric direct injection, which are twice as fast as regular injectors, and a high-pressure fuel pump (running at up to 1800bar) for more accurate combustion control, increased power, fewer emissions and quieter running. The system is able to produce as many as seven separate injections per cycle and can provide short pre-delivery injections when engine speeds exceed 3000rpm.
The D5 also uses post-injection whereby tiny amounts of fuel are injected into the combustion chamber following the main charge to help remove particulates found in the exhaust gases.
Ceramic glow plugs are used to provide rapid warm-up and can reach 1000-degrees Celsius in just two seconds (maximum operating temperature is 1300-degrees).
Revised engine mounts have also made the D5 very smooth at idle, in fact it's noticeably smoother than the four-cylinder unit, but more on that shortly.
Volvo have also done away with the dipstick, replaced on all models with an electronic display.
Driving the new D5 in the 2010 Volvo XC60 is a smooth and pleasant experience, free of the lag and clutter usually associated with diesel engines. The engine also feels more lively with far better accelerator response than that found on the already impressive previous model.
The D5 engine manages 151kW of power and 420Nm of torque (from 1500 - 3250rpm) for effortless acceleration, improving 0-100km/h times across the range by almost one full second (eg: Volvo XC70 D5 accelerates from rest to 100km/h in 8.9 seconds).
Fuel consumption has also decreased by as much as 1.2 litres per 100km in some models (eg: Volvo XC70 D5 now achieves a combined average of 7.5L/100km). CO2 emissions are just 199g/km, meeting strict Euro 5 emissions standards.
Expect a full review of Volvo's new D5 engine when CarAdvice concludes its road test of the XC60 D5 later this week.
Volvo 2.0D Engine
Volvo's smaller models will now benefit from the addition of a 2.0-litre (single) turbo-diesel, in-line four-cylinder engine.
Appropriately named, the 2.0D engine will be offered in Volvo's C30, S40 and V50, where it replaces the previous generation D5 unit.
The 2.0D introduces improved efficiency, lower emissions and, for the first time, a dual-clutch Powershift automated manual transmission to the three vehicles.
Fuel economy has been reduced by as much as eight per cent in models featuring the 2.0D powerplant, a unit that delivers 100kW at 4000rpm and 320Nm of torque from just 2000rpm.
2.0D uses an aluminium alloy cylinder head over a cast iron block and features second generation high pressure (1600bar) common rail fuel injection in conjunction with a variable nozzle turbocharger. The compression ratio of the 2.0D is 18.5:1.
In driving the new C30 & V50 2.0D models this afternoon, a strong and spirited performance is certainly evident, as is a near-negligible amount of turbo lag.
There's a hint of vibration and diesel chatter at idle, but once on the move the engine is incredibly smooth and quite pokey thanks to the quick thinking action of the new six-speed Powershift transmission.
The Powershift transmission was developed jointly with Volvo partner Getrag, and operates much like any other dual-clutch transmission where two parallel manual transmissions, with, in this case, twin wet clutches, work independently on different gear sets. First, third, fifth and reverse operate on one side while second, fourth and sixth are on the other.
Changes are almost imperceptible, very quick with no loss in power delivery noticed. The other upshot is an impressive reduction in fuel consumption with C30 2.0D now managing 5.9L/100km and just 156g/km of CO2 emissions. The 2.0D powered S40 and V50 models deliver 6.0L/100km combined fuel consumption and 159g/km CO2 emissions when mated to the Powershift transmission.
"Powershift contribute to a fuel consumption saving of about eight per cent compared with a conventional automatic transmission," said Mr Magnus Jonsson, Senior Vice President of Volvo's Research and Development.
The Powershift transmission can handle torque loads as high as 450Nm, meaning its use may be extended to other models down the track (hint hint C30 D5).
0-100km/h performance figures for 2.0D Powershift equipped C30, S40 and V50 models are all under ten seconds at 9.5-, 9.6- and 9.7-seconds respectively.
Expect a full review of Volvo's new 2.0D engine when CarAdvice road tests the S40 D later this month.
Volvo's new D5 and 2.0D models are on sale now.