The new British-built Vauxhall Astra will feature an eight-engine range when its goes on sale before the end of this year.

A new 1.4-litre turbo engine will join the range from launch, producing 140hp and 200Nm of torque between 1,850 and 4,900rpm. This engine replaces the naturally aspirated 1.8-litre from the current range.

Completing the petrol line-up for the new Astra is a normally aspirated 1.4-litre unit emitting 129g/km of CO2, and two 1.6-litre engines – one turbocharged, producing 180hp and the other a normally aspirated unit with 115hp.

The Astra’s diesel range comprises 1.3, 1.7 and 2.0-litre units, all of which feature common rail fuel injection. Vauxhall is confident the three diesel engine will all produce no more than 129g/km of carbon dioxide but still needs to confirm the official figures. The diesel power ranges from 95hp to 160hp.

All the Astra engines meet Euro V emissions standards and there are plans to add an ecoFLEX model to the range which is expected to achieve 109g/km of CO2 on the combined cycle.

All Astras will be equipped with six-speed gearboxes, with the exception of normally aspirated 1.4- and 1.6-litre models and the 1.3-litre CDTi which employ a five-speed manual gearbox. A new automatic transmission will be available for all petrol models.