EPS/2 Engine to Platform Application Specialist
Mr Brož, what led to the decision that Volkswagen would develop a brand-new diesel engine?
From the perspective of performance and efficiency, diesels are still one of the most efficient types of engine in the automotive industry. They offer high maximum torque combined with low fuel consumption and – thanks to modern exhaust technology – low emissions. Most notably, diesels come into their own on long journeys. The engines produced by Volkswagen are constantly being developed in order to further optimise them, make them even more efficient and to further reduce CO2 emissions. The new EVO engines are the result of this development work.
How are the EVO engines different from conventional EA 288 engines?
The new EVO generation is considerably different to the EA 288 engines used until now. Thanks to the separation of the cooling for the cylinder head and engine block, the EVO versions reach optimum operating temperature more quickly. Overall, the cooling concept has also been optimised. The VGT vanes for the exhaust-gas turbochargers fitted in the new engines are adjusted electronically using a control unit. This allows for more precise and faster adjustments. The injection system with solenoid valve injectors is designed for a maximum system pressure of 2,200 bar. As the new ŠKODA SUPERB features an electromechanical brake booster, the engine no longer needs a vacuum pump. In addition, we have insulated the engine more comprehensively, allowing us to further improve the acoustic characteristics of the car.
Are there any design-related or structural differences between the individual power variants?
The new EVO generation of engines covers a very broad spectrum of power outputs, ranging from 90 kW (122 PS) to 147 kW (200 PS), and offers maximum torque of up to 400 Nm. in order to be able to achieve such a range, we have developed a so-called efficiency variant for the 90-kW (122-PS) and 110-kW (150-PS) power levels and a performance variant outputting 147 kW (200 PS), which is structurally different as well. In the 147-kW version the engine block and pistons are made of aluminium, whilst the other two engines use steel pistons with longer connecting rods. These two also feature smaller-diameter main and con rod bearings. The performance variant also has a water-cooled turbocharger and uses an electronic coolant distribution unit, which regulates the coolant flow via an electric actuator and a thermostat. In contrast, the efficiency variant employs thermostatic regulation.