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Volvo may soon have its 90 Series of vehicles adopt its new 1.5 litre Twin Engine plug-in hybrid powertrain. Initially designed for use in the brand’s compact models, the car maker believes that enough power is available to motivate its larger models as well.

“We have been running a V40 mule with the turbocharged three-cylinder engine and a dual-clutch gearbox, and it’s already excellent,” said Volvo’s head of research and development Dr Peter Mertens to Auto Express.

“With the 1.5 we can easily get up to 150 hp and more, and unless somebody told you, you wouldn’t know it’s a three-pot. We will definitely have it in the next 60 Series models (S60, V60 and XC60) and I can easily see how it would end up in the S90 as well. It’s really promising,” he continued.

Currently, the only hybrid powertrain available to the XC90, S90 and V90 is the 2.0 litre T8 Twin Engine which produces 407 hp and 640 Nm of torque. While Volvo’s 1.5 litre three-cylinder petrol engine develops up to 150 hp, the T5 Twin Engine for its compact models promises up to 250 hp and 400 Nm of torque – sufficient figures, it seems, to haul larger models likes those in the 90 Series.

As detailed before, the new T5 Twin Engine was said to be for the car’s more compact models, such as the Volvo V40 and expected XC40. The plug-in hybrid powertrain consists of a 1.5 litre Drive-E petrol engine which drives the front wheels and a 55 kW electric motor which powers the rear – forming a hybrid all-wheel drive system.

Detailed earlier for use in a compact vehicle, the T5 Twin Engine’s vitals should differ once fitted to a larger 90 Series model. For its 40 Series, though, the powertrain is said to yield a full electric driving range of over 50 km, be equipped with a 9.7 kWh lithium-ion traction battery and will be mated to a six-speed dual-clutch automatic transmission.