Audi 3.0 V6 TFSI Engine with Roots Blower

Online PDF Audi 3.0 V6 TFSI Engine with Roots Blower

For the first time, Audi has brought to market a mechanically supercharged powerplant: the 3.0l V6 TFSI. This Roots blower supercharged engine is based on the 3.2l V6 naturally aspirated engine from the current Audi V-engine family. By embracing new technology, in combination with the FSI combustion process, Audi has developed an engine concept that has impressive compact design, acoustics, responsiveness and fuel efficiency.

The engine has a broad range of characteristics from comfort-oriented to ultra-sporty. The sporty version of the engine specifically targets US clientele. The car’s so-called take-off behavior plays a key role to achieve the greatest possible acceleration between traffic lights in urban traffic.

With its enormous power the 3.0l V6 TFSI engine is also well suited to comfort-oriented driving. A wide range of uses have been envisioned for it within the Audi product portfolio. In Europe, China and the USA, it will be available beginning in the Fall of 2008 in the Audi A6.

Historically, mechanical supercharging using Roots blowers is nothing new to cars bearing the four-ring badge. In fact, Roots blowers were once used on the engines of the legendary AUTO UNION racing cars (“Silver Arrows”), which were powered by huge V engines with up to 16 cylinders supercharged by up to two Roots blowers. Between 1934 and 1939, the legendary AUTO UNION drivers spearheaded by Hans Stuck and Bernd Rosemeyer racked up numerous Grand Prix wins, not to mention setting a string of world speed records.

The 3.0l V6 TFSI engine will be used for the first time in the 2009 Audi A6.  

Main technical features:
Six-cylinder V engine with mechanical supercharging 
– (technical basis: 3.2l V6 FSI engine)
Fuel supply, activated carbon filter system, exhaust 
– system (manifold for selective lambda control) and engine cooling system are identical to those of the 3.2l V6 FSI engine in terms of their geometry and position. 
Vacuum system with mechanical vacuum pump 
– (identical to that of the 3.2l V6 FSI engine)

Although the 3.0l V6 TFSI engine does not have the largest displacement of the Audi V6 engine family, it sets the benchmark for power output. This is also reflected in its performance, where the engine outstrips the equivalent naturally aspirated 3.2l V6 FSI unit.

The same goes for economy, i.e. fuel consumption and exhaust emissions. In the figure, you are shown a comparison of the full-throttle curves of the V6 FSI engines installed on the Audi A6. The cylinder block is identical to that of the 3.2l V6 FSI engine. However, the load on the engine is higher due to the increased mean peak pressure (combustion pressure). To ensure high stability, the bearing seats undergo a special heat treatment process during manufacturing. Also, higher strength main bearing bolts are used.

Crankshaft drive
The crankshaft has been adapted for a stroke of 89 mm. Like the 3.2l V6 FSI engine, the crankshaft has a split-pin configuration* (see glossary). The newly developed, cracked con-rods* are 153 mm long and optimised for strength. All bearing bushings are lead-free 3-component composite bearing bushings.

Unlike the 3.2l V6 FSI engine, the pistons are rated for a compression ratio of 10.5:1.
The piston skirts have a wear resistant Ferrostan plating. 
The special piston ring combination provides:
High power output 
–Low blow-by gas flow rates 
–Low oil consumption 
–Minimum friction and wear

Online PDF Audi 3.0 V6 TFSI Engine with Roots Blower