VW has revised the 1.5 TSI of the EA 211 engine series. The unit is used in many different models worldwide - the new Evo 2 version for the first time in the T-Roc and the T-Roc Cabriolet.
The 1.5 liter four-cylinder from Volkswagen definitely deserves the designation "world engine". The group has been using the petrol engine in numerous model series from the Polo to the Passat around the world since 2012. Four million units of the unit are manufactured every year at eleven locations on three continents - this means that the TSI is in every third Volkswagen that is built. It is logical that the Wolfsburg-based company is now making the engine fit for the upcoming exhaust gas standard tightening to Euro 7 . Read how strict it could be here or listen to the podcast.
The four-cylinder makes its debut as a 150 hp version in the T-Roc and its convertible derivative. Further models will follow by the end of 2022. In a PHEV configuration, a system output of up to 272 hp is possible. ,
Increase in efficiency
The combustion process, exhaust gas cleaning and cylinder deactivation have been optimized. The engineers have moved the three-way catalytic converter and the Otto particle filter closer to the engine itself in order to improve their efficiency. At the same time, Volkswagen is reducing the proportion of precious metals within the module. As far as cylinder deactivation is concerned, the deactivation and activation process is said to have been optimized. At low and medium engine speeds, cylinders two and three are not fired. They should run as loss-free as possible until a higher load requirement activates them again. VW provides the raceways with a plasma coating to reduce friction. In addition, cooling channels are cast into the pistons to further optimize combustion. ,
Speaking of the combustion process: Volkswagen is sticking with the combination of Miller Cycle and VTG charger (variable turbine geometry) in the Evo 2 expansion stage. The former describes a principle in which the intake valve closes during the intake stroke. Accordingly, less mixture gets into the cylinder, but the geometric expansion ratio is increased by high compression. The same pressure prevails at top dead center as when the combustion chamber is fully charged. As a result, less residual pressure is released at the outlet and the exhaust gas temperature drops. The VTG charger, in turn, benefits from this, which compensates for the power loss due to the reduced cylinder filling by delivering an extra portion of torque during the intake stroke. All in all, this operating principle means that less fuel is burned and correspondingly fewer pollutants are released into the environment. In the photo show above you can see the upcoming facelift version of the T-Roc, which will be the first to receive the revised unit. ,
Conclusion
Volkswagen is optimizing its best-selling engine from the EA 211 family so that the 1.5-liter four-cylinder can also meet the upcoming Euro 7 emissions standard. The engineers have modified the combustion process, exhaust gas purification and cylinder deactivation. First of all, the updated engine with the identifier "Evo 2" is to be installed in the T-Roc and T-Roc Cabrio as a 150 hp variant. Further models will follow by the end of 2022.
