Volvo Adds Two New 1.6 GDTi Engines to its range

Volvo is expanding its engine range with the T3 and T4, two four-cylinder 1.6- Gasoline Turbocharged Direct Injection (GDTi) engines.

The 1.6 GTDi T3 and T4 will be launched in autumn 2010 together with the new Volvo S60 and V60. The GTDi engines will later also become available in an E85 (ethanol) version.

The 1.6 GTDi T3 with 150 horsepower (110 kW) and the T4 with 180 horsepower (132 kW) will be available in the all-new Volvo S60 and V60. The 180 hp engine delivers maximum torque of 240 Newton meters from just 1600 and all the way up to 5000 revs a minute.

An on-demand overboost function provides a massive 270 Newton meters of torque. The result is excellent pulling power across the entire speed range. The torque curve is relatively gentle, providing a particularly comfortable driving experience. The 150 hp version offers 240 Newton meters of torque.

The new GTDi engines have a compact format and are made entirely from die-cast aluminum, which gives low weight and good heat-dissipation capability.

Direct injection with spray-dosage multi-hole injectors
For its 1.6-liter engines, Volvo has chosen to position each injector centrally above the piston, just beside the spark plug. The injectors have six holes each, somewhat unusual for centrally positioned injectors. This gives particularly uniform and finely atomized fuel distribution.

The centrally located multi-hole injector makes it possible to control fuel dosage extremely precisely. In cold starts, the fuel is sprayed into the middle of the combustion chamber just prior to ignition. The high fuel injection pressure of 100 bar means that preparation is perfect and less fuel ends up on the cold combustion chamber walls. This helps cut emissions and considerably reduces the amount of fuel consumed. Another effect is a major reduction in the amount of soot particulates compared with a side-positioned injector.

In cold starts, this injection technology also contributes to quick heating of the catalytic converter, which in turn hastens the exhaust cleaning process.

Direct injection gives a high fill rate in the combustion chamber. Apart from effective combustion and low emissions, this also helps the turbo start up earlier and provides swift response even from low engine revs. This in turn promotes fast acceleration and good driveability from low speeds.

Turbo and twin VVT (Variable Valve Timing)
Direct injection in combination with turbocharging and variable valve timing has made it possible to deliver performance properties on a par with far larger engines, while at the same time reducing fuel consumption and environmental impact to considerably lower levels.

"We estimate reductions in fuel consumption and exhaust emissions in the region of twenty percent compared with a conventional gasoline engine with larger displacement and similar performance," says Magnus Jonsson. "At the same time, the GTDi engines provide the sort of lugging power and driving feel of a modern diesel engine."
The GTDi engines utilize variable valve timing for both camshafts. Both the inlet and exhaust valves' opening times can be varied to optimize overlap and ensure exactly the right fill in the combustion chamber, irrespective of engine revs. This optimizes combustion throughout the rev range and contributes to swift acceleration in all operating conditions.

In combination with Powershift or manual gearbox
The 1.6 GTDi  T4 will be available in combination with Volvo's automatic six-speed Powershift transmission or a six-speed manual gearbox.

The 1.6 GTDi  T3 will only by available with a six-speed manual gearbox.

Both variants feature a DRIVe-button on the instrumentation that engages and disengages fuel-saving technology.

The six-speed twin-clutch Powershift transmission unites the manual gearbox's efficiency and driving dynamics with the automatic transmission's smoothness and convenience. Clutch operation is coordinated so that no torque losses arise during gearchanges. The result is the same comfort and seamless drive as a conventional automatic transmission, combined with the performance of a manual gearbox.

Engine specifications 1.6 GTDi T3:
Engine type    4-cylinder gasoline turbo
Displacement    1595 cm3
Bore    79.0 mm
Stroke    81.4 mm
Compression ratio    10.0:1
Valves per cylinder    4
Camshafts    DOHC
Max power output    110 kW (150 hp)
Max torque    240 Nm
Emissions    Euro 5

Engine specifications 1.6 GTDi T4:
Engine type    4-cylinder gasoline turbo
Displacement    1595 cm3
Bore    79.0 mm
Stroke    81.4 mm
Compression ratio    10.0:1
Valves per cylinder    4
Camshafts    DOHC
Max power output    132 kW (180 hp) / 5500 rpm
Max torque    240 Nm / 1600-5000 rpm, 270 Nm for brief overboost
Emissions    Euro 5