2018 VW Tiguan receives new 2.0-liter TSI engine

Article by Christian A., on May 25, 2017

Volkswagen of America has a nice surprise for potential customers of the new VW Tiguan (2018 model year). The latest iteration of the Tiguan – set to arrive in the United States this summer -- will be the first VW model to be fitted with the new advanced version of the German carmaker’s EA888 four-cylinder gasoline engine.

This new engine is a revised yet improved version of VW’s third-generation (Generation 3) EA888 that boasts of a displacement of 1.8 liters. The 1.8-liter four-cylinder, turbocharged and direct-injection EA888 Gen 3 engine (1.8 TSI) is still what powers current models of the VW Beetle, Golf, Jetta and Passat. VW has made certain updates to its four-stroke cycle to improve not only its levels of power and efficiency, but also its responsiveness, resulting to the creation of the 2.0-liter EA888 Gen 3B engine (2.0 TSI).

Updates implemented on the EA888 Gen 3 engine include using a longer piston stroke, a tweak which was responsible for the increase in the updated mill’s displacement. The piston stroke on the 1.8 TSI is 84.1 mm while on the 2.0 TSI, it is 92.8 mm. VW also modified the engine’s piston crown and combustion chamber, resulting to a higher compression ratio of 11.7:1.

In addition, VW employed new TSI injectors that are designed to inject fuel into the engine’s cylinder at a higher max pressure (3,626 psi or 250 bar). Likewise, up to three injection sequences per stroke could be achieved depending on conditions. Furthermore, VW updated majority of the third-generation like its cast-iron block, aluminum alloy pistons, cylinder head and valve springs.

Additionally, VW introduced a modified Miller combustion cycle – exclusive to the Volkswagen Group – as a result of the quest to make the engine more efficient in the most employed range of driving. Conventionally, the Miller combustion cycle closes the intake valves before the intake stroke ends. However, the so-called Budack-cycle closes the intake valves at an earlier time, resulting to longer effective combustion and faster airflow for the incoming gases. Since this improves the blending of fuel and air, the updated engine consumes less fuel while delivering more torque.

Likewise, the updated engine features variable valve timing system on the intake camshaft. This gives the engine the ability to switch between short and long valve opening, depending on the load.

All these updates have allowed the new 2.0-liter EA888 Gen 3B engine in the 2018 Tiguan to deliver 184 hp of max output at 4,400 rpm and 221 lb.-ft. of peak torque available between 1,600 rpm and 3,940 rpm. The US Environmental Protection Agency has yet to provide the final fuel economy estimates for the updated engine, although VW claims it is more efficient than its predecessor. For now, only the Tiguan features this engine, although this updated mill will soon find its way in VW’s newer models.

Press Release

2018 VOLKSWAGEN TIGUAN DEBUTS NEW 2.0-LITER TSI® ENGINE THAT IS RIGHT SIZED FOR POWER AND EFFICIENCY

The all-new 2018 Volkswagen Tiguan arrives in dealerships this summer powered by the most advanced version ever of Volkswagen’s EA888 four-cylinder engine. The updated version of the benchmark EA888 four-cylinder, turbocharged and direct-injection engine uses an innovative modification to the conventional four-stroke cycle to offer an improved combination of power, efficiency and responsiveness.

First introduced in the 2009 CC, the EA888 continued Volkswagen’s move toward smaller, turbocharged engines that offer the fuel economy benefits of downsizing with the power of a larger-displacement unit. Though EPA estimates are not yet available, compared with the 1.8-liter EA888 Gen 3 engine that is fitted in the current Passat, Jetta, Beetle, and Golf family models, the new 2.0-liter EA888 Generation 3B is expected to offer improved fuel efficiency along with a 20 percent boost in maximum torque to 221 pound-feet. The majority of the engine—from the cast-iron block to the aluminum-alloy pistons and cylinder head to the valve springs—has been updated along the way.

During development, engineers focused on making the engine more efficient in the range of driving that most customers use every day, which led to the introduction of a modified Miller combustion cycle that is unique to the Volkswagen Group. Whereas the traditional Miller cycle closes the intake valves just before the end of the intake stroke, the so-called Budack-cycle closes the intake valves much earlier. This results in longer effective combustion as well as faster air flow for the incoming gases, which improves the mixing of the fuel and air. The net effect is lower fuel consumption and more torque than the 2.0-liter EA888 engine fitted in the 2017 Tiguan.

The key feature that enables the new engine to produce better fuel economy, as well as excellent performance, is the variable valve timing system on the intake camshaft. Depending on engine load, it is possible to switch between short and long valve opening. At idling speed and under partial load, the valve opening is shorter. When the engine is placed under greater load, a switch to the camshaft lobe that opens the valve for a longer period is made and the driver can make use of the full power and torque of the engine.

The changes in the new version of the EA888 advance the twin goals of power and efficiency. The peak 184 horsepower (for the Tiguan) kicks in at 4,400 rpm, 400 revs sooner than in the 1.8-liter edition, and maintains its output until 6,000 rpm. Maximum torque of 221 lb-ft is achieved at 1,600 to 3,940 rpm. As in the previous 2.0-liter TSI® engines, the increased displacement comes solely from a longer piston stroke (92.8 mm vs. 84.1 mm in the 1.8 TSI), while the compression ratio rises to 11.7:1 due to a modified piston crown and combustion chamber. New TSI injectors can push fuel into the cylinder at a higher maximum pressure (250 bar or 3,626 psi), with up to three injection sequences per stroke depending on conditions.

The EA288 Gen3B retains many key features of its predecessors, from chain-driven double overhead camshafts to the twin balance shafts that not only counteract second-order internal forces but provide oil scavenging and crankcase breathing pathways. A new engine management system with four core processors monitors the system and adjusts as needed. Reducing friction was another goal for this engine. For instance, the lower brake mean effective pressure at full load in this engine allowed the crankshaft main bearing diameter to be reduced from 52 to 48 mm, while the balance shaft chain is narrower.

The new 2.0-liter TSI engine will be the only powerplant offered in the 2018 Tiguan. It will later be offered in other Volkswagen models.

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Topics: vw, vw tiguan, engine, petrol

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