Text: Marcus De Guzman / Photos: Volkswagen | posted April 29, 2016 14:15
Harder-wearing, more fuel efficient TSI motor unveiled
Volkswagen will be arriving at this year's Vienna Motor Symposium with a new-generation TSI engine that they claim will be more efficient, harder wearing and deliver better power. Displacing 1.5-liters, the new EA211 is the first of the next-generation TSI motors that gets a host of technical upgrades like a new combustion cycle, higher compression ratio, variable turbo technology and cylinder deactivation.
It now uses a Miller combustion cycle, which allows the engine to have a compression ratio of 12.5:1. Moreover, it also improved the engine's thermodynamic efficiency, increased charge density for the turbo and reduced knock tendencies at higher loads as such.
Engines rated at 150 PS have their cylinder liners coated using atmospheric plasma spray (APS). This meant that each cylinder has lubrication pockets that ensure the piston rings glide smoothly. It also enhances corrosion resistance and delivers good wear protection in hybrid applications according to Volkswagen.
For the first time, Volkswagen's TSI engine now gets variable turbine geometry (VTG) for its turbocharger. It features an electronic VTG actuator and a mixed-flow turbine. According to the automaker, this will allow the 1.5-liter TSI to generate maximum torque 35-percent faster than the outgoing 1.4-liter.
As previously mentioned, the new compact engine also benefits from cylinder deactivation technology. It works by closing the intake and exhaust valves of cylinders two and three up to mid-load range, while at the same time deactivating fuel injection.
Additional friction protection is provided by a map-controlled fully variable oil pump, polymer coated first main crankshaft bearing and the use of low viscosity 0W20 oil.
It is set to be launched in late 2016 and will be joined by smaller displacement engines starting at 1.0-liter. In addition, it there will also be three-cylinder variants and can be powered by compressed natural gas (CNG) and ethanol. Output rating of the 1.5-liter mill is expected to range from 130 to 150 PS.