The new Volkswagwen Polo BlueGT, with 103 kW / 140 PS and a combined fuel consumption of 4.5 l/100 (DSG version), brings together the two seemingly conflicting goals of 'dynamics' and 'fuel efficiency'. The technical highlight of the sporty compact car is its progressive TSI engine with active cylinder management (ACT) - this cylinder deactivation feature alone, the world's first in a four-cylinder engine, yields fuel savings of 0.4 l/100 km. In addition, the VW Polo BlueGT is an excellent example of how numerous aspects of the worlds of sportiness and fuel efficiency can be combined to create a new automobile - in this case by applying elements taken from the Polo GTI as well as the Polo BlueMotion.

Lighter and more efficient TSI. The 1,395 cc engine of the Volkswagwen Polo BlueGT, which weighs in at just 114 kg, develops its specified 140 PS between 4,500 and 6,000 rpm. Equipped with the standard 6-speed manual gearbox, the Volkswagen has a combined fuel consumption of just 4.6 l/100 km/h Super Unleaded (95 octane); this is equivalent to CO2 emissions of 107 g/km. When the Polo BlueGT is ordered with the optional 7-speed dual clutch gearbox (DSG), fuel consumption is reduced to the previously mentioned 4.5 l/100 km (105 g/km CO2).

Power of a large car. Despite its sustainable fuel economy and emissions values, the compact VW Polo BlueGT is very agile: this Volkswagen, which has a top speed of 210 km/h, accelerates to 100 km/h in just 7.9 seconds. Also having a positive effect on dynamics is the high torque of the TSI. The torque curve is interesting in that it exhibits a plateau-like shape at its upper end: the maximum torque of 250 Nm is available at a low 1,500 rpm and remains constant at this level right up to 3,500 rpm. This uncommon coexistence of efficiency and dynamic performance is enabled by the systematic interplay of ACT, downsizing (reduced engine displacement plus direct injection and charging) and BlueMotion Technologies (Stop/Start system, battery regeneration).

Engine technology - the 1.4 TSI with ACT
The 1.4 TSI of the Volkswagwen Polo BlueGT is the top engine of the entirely new EA211 series of petrol engines that has been developed. The engine range consists of 1.0, 1.2 and 1.4 litre engines. The efficient 1.0-litre three-cylinder engines (MPI engines without charging between 44 kW / 60 PS and 55 kW / 75 PS) are used to drive such cars as the new up!. The 1.2- and 1.4-litre four-cylinder engines were each designed as charged direct fuel injection engines (TSI). They produce 63 kW / 85 PS and 77 kW / 105 PS (both 1.2 litre) as well as 90 kW / 122 PS and 103 kW / 140 PS (both 1.4 litre). One feature common to all engines is their cylinder spacing of 82 mm. Technically, the engines were also designed for use in the future Modular Transverse Matrix (MQB) with identical engine mounting positions.

Aluminium block reduces weight
Thanks to an ultra-rigid aluminium die-cast crankcase, the new petrol engines are especially light with a maximum weight of 114 kg. A point of reference: the 1.4 TSI of the new Polo BlueGT is a respectable 22 kg lighter than its grey cast iron counterpart of the previous engine series. The meticulously practised lightweight construction for which Volkswagen is renowned extends to the smallest of details: for example, engine developers reduced the crankshaft main bearing diameter of the 1.4 TSI from 54 to 48 mm; the crankshaft itself was lightened by 20 per cent, while the weight of the connecting rods was even reduced by 25 per cent. The rod bearing pins are hollow bored, and the aluminium pistons (now with flat piston crowns) have also been weight-optimised.

Exhaust manifold in the cylinder head
Particular importance was also paid to the whole issue of thermal management. To use optimally the thermal energy of the exhaust in the hot running phase, and on the other hand to cool it more effectively at high loads, the exhaust manifold of the new EA211 engines was, for example, integrated in the cylinder head and was provided with its own cooling jacket.

Small turbocharger, big effects
By means of the innovative construction of the exhaust manifold, Volkswagen was also able to use just a very narrow single-scroll compressor in turbocharger selection. Once again, this reduced the engine's weight. In the EA211, the intercooler was integrated in the induction pipe which is made of injection-moulded plastic. The advantage: significantly accelerated pressure build-up. And this has resulted in very responsive downsized engines.

свернуть