Volkswagen Group EA211 evo 1.5L TSI engine

Volkswagen AG
EA211evo
Production period:	since 2017
Manufacturer:	Volkswagen AG
Engine Type:	line
Valve control:	DOHC
displacement:	1498 cm 3
Fuel supply:	direct injection
Engine charging:	turbocharging
Power:	96-110 kW
Previous model:	VW EA211

The VW EA211evo (EA = development order) is the further development of the gasoline engine series EA211 of Volkswagen AG . The series includes engines with three and four cylinders and will be used from 2017 in various vehicles of the Volkswagen Group. Important features of the EA211 series have been retained, including the construction as a full aluminum engine, the four-valve technology , the drive of the two overhead camshafts ( DOHC valve control ) via a maintenance-free timing belt and the exhaust manifold integrated into the cylinder head .

Technology 

The engines of the EA211evo series are based on the EA211 series engines used in numerous vehicles of the Volkswagen Group since 2011. There will also be a 1.0-liter three-cylinder variant with intake manifold injection and without supercharging (1.0 MPI) and a 1.0-liter three-cylinder variant with direct injection and exhaust turbocharging (1.0 TSI). The 1.2-liter four-cylinder variants are omitted without replacement. The new 1.5-liter four-cylinder (1.5 TSI) are based on the old 1.4-liter engines. By extending the stroke from 80.0 mm to 85.9 mm, the engine capacity is increased from 1395 cc to 1498 cc. 

The engine block is a so-called open-deck construction in die-cast from aluminum alloy produced AlSi9Cu3. The 1.5-TSI variant with 96 kW continues to rely on cast-in liners made of gray cast iron . In the 110 kW variant, a coating is applied to the aluminum liner by means of plasma spraying. 

All variants have four valves per cylinder, which are operated via roller rocker arms of the two overhead camshafts ( DOHC valve control ). The camshafts are driven by the crankshaft via a maintenance-free toothed belt .

All 1.5 TSI engines feature stepless adjustment of the intake and exhaust camshafts by means of hydraulic phasers. In addition, the 1.5 TSI is standard on a cylinder deactivation , which is also referred to as Volkswagen Active Cylinder Technology (ACT). At low and medium load, the second and third cylinders are shut down. The 1.5 TSI with 110 kW has sodium-filled exhaust valves due to the high exhaust gas temperatures . 

Charging and exhaust 

The weaker variants of the 1.0-liter three-cylinder engine have intake manifold injection and no charge . Therefore, they are also referred to by Volkswagen as "MPI" engines (Multipoint Injection).

The more powerful versions of the three-cylinder and all four-cylinder, however, have a direct injection and a turbocharger . Volkswagen uses the brand name " TSI " for these engines . Depending on the variant, different turbochargers are used, which differ mainly in the dimensions of the turbine and compressor wheels.

The 96 kW variant of the 1.5 TSI uses a turbocharger with variable turbine geometry ( VTG loader ). This construction has been widespread in the field of diesel engines for several years, but in gasoline engines, due to the higher exhaust gas temperatures so far found only in a few models. The VTG supercharger in the 96 kW variant is designed for exhaust gas temperatures up to 880 ° C, the conventional turbocharger with wastegate in the 110 kW variant for exhaust gas temperatures up to 1050 ° C. All engines have a three-way catalytic converter .

All engines are liquid cooled . The engine cooling high-temperature cooling circuit is divided into two circuits, one for the cylinder block and one for the cylinder head, to accelerate warm-up. Each circuit has its own thermostat. The cooling of the cylinder head is based on the principle of cross-flow cooling.

There is also a low-temperature cooling circuit for indirect intercooling. In this cycle, the cooling of the exhaust manifold and the turbocharger is involved. The low temperature circuit has an electrically driven coolant pump, which, for example, the turbocharger can be cooled even after parking the vehicle.

Variants

1.5-l four-cylinder (1.5 TSI) 

The capacity of the four-cylinder in - line engine is 1498 cc with a bore of 74.5 mm and a stroke of 85.9 mm with a cylinder spacing of 82 mm. The compression is 12.5 for the 96 kW variant and 10.5 for the 110 kW variant.