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Vauxhall will be bringing a new diesel engine to the Paris motor show next month. Set to see first duty under the bonnets of the Insignia and Zafira Tourer, the new Euro 6-compliant 2.0 litre CDTi now sits at the top of Vauxhall’s diesel range, replacing the 163 PS version.

Developed in-house by engineers in Turin, Rüsselsheim and North America, the new engine will be built at Opel/Vauxhall’s Kaiserslautern engine plant in Germany. It will be available next year.

The new numbers are 170 PS at 3,750 rpm and 400 Nm from 1,750 to 2,500 rpm. That’s almost five percent more power and 14% more torque than before, Vauxhall says, while being cleaner, quieter and more fuel-efficient.

There’s a newly-designed combustion chamber, reprofiled intake ports and a new fuel injection system with 2,000 bar and up to 10 injections per cycle. The variable geometry turbo (VGT) features an electrical actuator for the variable-aspect turbine, giving a 20% faster boost response than a vacuum actuator.

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Also working against the dreaded turbo lag is compact packaging of the VGT and intercooler, resulting in minimal air volume between the engine and turbo. The turbo is water-cooled and has an oil filter at the oil inlet point to reduce wear in the bearing system.

The exhaust gas recirculation (EGR) module is based around a new stainless steel radiator concept which offers a near 90% cooling efficiency, while an integrated, water-cooled EGR bypass valve minimises pressure drop and improves emission management.

Noise, vibration and harshness (NVH) have been reduced through a new aluminium cylinder head design, including the addition of a decoupled plastic cam cover with isolated fixings and a sealing gasket.

A new balance shaft module, made of high pressure die-cast aluminium, is fitted at the bottom of the engine. It houses two counter-rotating shafts which offset up to 83% of secondary-order engine vibrations, Vauxhall says. A redesigned oil pan also contributes to NVH performance.

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And that’s not all – the fuel injection patterns have been optimised, there are acoustically-designed ribs in the cast-iron block and the timing belt’s teeth-meshing has been improved. The result? Less noise throughout the operating range than before, and five decibels quieter at idle.

Kinder to Mother Nature, too – Vauxhall’s BlueInjection Selective Catalytic Reduction system features here, working to remove NOx from the exhaust gases. Tiny quantities of the urea-water solution AdBlue are injected into the exhaust gas flow, ahead of the SCR catalyst and downstream of the diesel particulate filter.

The AdBlue is immediately converted into ammonia, which is absorbed by the SCR catalyst. Nitrogen oxide in the passing exhaust gas is then selectively reduced to harmless nitrogen and water vapor in a chemical reaction with the ammonia.

“This excellent new powertrain is part of the company’s four billion euro (RM) investment in product and powertrain development, which is helping to bring 23 new products and 13 new engines to market,” said Vauxhall MD Tim Tozer.