Audi. Saturday , November 04th , 2017 - 12:30:56 PM
With the newly developed 2.9 TFSI, Audi has drawn upon the legendary 2.7 liter V6 from the first RS4 Avant. Produced between 1999 and 2001, it delivered 280 kW (380 hp). Just like the 2.7 liter engine, the new high-performance V6 is also designed as a bi-turbo engine. In comparison with its direct predecessor, a freely-aspirated, high-revving V8 unit, its pulling power and efficiency attain a whole other dimension.
The 2.9 TFSI was derived from the 3.0 TFSI used in the Audi S5. Because of the greater forces inside the engine, the valve lift has been shortened by 3 millimeters (0.1 in) to 86 millimeters (3.4 in). With its unchanged bore of 84 millimeters (3.3 in), the displacement is 2,894 cm3. The crankcase integrates thin-walled cylinder liners made of gray cast iron and the crankshaft main bearing has a 2-millimeter (0.08 in) larger diameter compared with the 3.0 TFSI.
In the classic Miller cycle, the reduced cylinder charge is detrimental to torque and power output. These aspects have been neutralized by Audi thanks to the implementation of turbocharging and the two-stage Audi valvelift system (AVS). The four camshafts of the 2.9 TFSI can each be adjusted by 50 degrees crank angle. At higher load and engine speed ranges, AVS closes the inlet valve later. The opening time increases from 130 to 200 degrees crankshaft angle, while at the same time the valve lift increases from 6.0 to 10.0 millimeters (0.2 to 0.4 in). Cylinder charging also increases considerably - the 2.9 TFSI revs up powerfully and delivers an impressive output.
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