What is it?
The first petrol-powered model to be launched under the company’s ‘Bluemotion’ branding.
It’s powered by a new 999cc three-cylinder turbocharged engine based on the impressive unit currently used in the Up city car. The headline claims are for an official CO2 rating of 99g/km and 65.7mpg on the combined cycle.
There’s no doubt that this engine is something of an engineering gem. Volkswagen claims it has the highest specific torque output of any "large-scale series production petrol engine", with 147lb ft being produced by just 999cc.
This three-cylinder unit is part of the EA211 engine family and based around a die-cast crankcase made from a sophisticated aluminium alloy. The exhaust manifold is integrated into the cylinder head and fitted with a cooling jacket which is fed from the engine’s main cooling system.
Two advantages are gained from this. Firstly ,the exhaust gases can help get the engine’s coolant up to operating temperature more quickly, which is essential for maximum fuel efficiency. Secondly, at high speeds the coolant helps cool the exhaust gases before they are sent to drive the turbocharger.
The turbocharger’s impressively compact intercooler – which is integrated into the engine’s intake manifold system – is also connected to the engine’s cooling system. Usually, intercoolers are air cooled and mounted remotely from the engine, being sited by the radiator in the nose of the car.