Audi A8 4

27 Aug 2014 | Author: | Comments Off on Audi A8 4
Audi A8

4.0 TDI quattro

Text and courtesy of Audi AG

Audi is the range of engines available for the new A8 a supremely powerful TDI version. The A8 4.0 TDI which has an output of 202 kW (275 is making its d�but at the Geneva Show. The newly developed biturbo engine with two not only has a higher swept and power output than its the 3.3-litre 165 kW (225 bhp) it is the first TDI version in Audi’s new of V engines and has a chain drive for and ancillaries.

The A8 4.0 TDI quattro definitively the performance of diesel-powered cars to status. This fleet-footed saloon with aluminium sprints from 0 to 100 km/h in 6.7 seconds and achieves a governed top of 250 km/h. Its overwhelming torque of 650 metres offers a quality of that can otherwise only be in sports cars, across the speed range.

650 Newton metres not only the A8 4.0 TDI quattro the highest-torque Audi in but put it right at the top of its class. The 4.0 TDI engine is the highest-powered, highest-torque V8 diesel in any production saloon car. Its refinement moreover sets a new in this class.

The sheer and the specific characteristic of this power unit once reaffirm the credentials of the Audi A8 as the saloon car in the luxury segment. And to its top-of-the-range TDI, Audi again demonstrates its expertise and in the development of such powerful, and notably economical diesel

Compact power plant

in the footsteps of the 4.2-litre petrol which powers the Audi S4, the 4.0 TDI is now the member of Audi’s new family of The TDI, too, is remarkable for its compact dimensions: the engine just 516 millimetres in length. One new V8 engine built by a competitor is 150 millimetres longer, even its displacement is the same.

The 90-degree block of the V8 is made from graphite cast iron, a that exhibits almost the strength of conventional grey iron yet weighs around 15 less. This is one of the vital to the engine’s low overall weight of 270 kilograms, which makes the 4.0 TDI one of the diesel V8s around.

Both the bore (now mm) and the … (now 95.5 mm) are than on the predecessor version. results in an overall displacement of cc. The cylinder spacing is 88 millimetres, and the ratio 17.5:1.

There are valves per cylinder, for optimum of the combustion chamber. The valves on the new V8 are by roller cam followers with valve clearance compensation, the earlier version still sliding cam followers. This drive technique plays a part in reducing both the consumption and the emissions of the 4.0-litre

Audi A8

The use of roller cam followers is likewise to the engine’s acoustics. In conjunction the twisted-type and therefore virtually camshaft drive, these are instrumental to the 4.0 TDI’s smooth

New common rail technology

The developed Bosch EDC16 with fuel delivery, boost pressure and exhaust-gas control, is responsible for engine in the V8 TDI.

As on the A8 with V8 petrol this electronic system now that it is possible to start the automatically at the push of a button. The system ensures that it no more than a few moments for the to spring into action, at very low winter temperatures.

As is typical of a V8 TDI, mixture is performed by a common rail with one high-pressure pump and one per cylinder bank. On the new generation of the injection pressure has been from 1350 bar to 1600 This results in even atomisation of the fuel, in other in more effective mixture

The consequence is not merely extra and torque, but also reduced consumption and emissions.

The second-generation injectors with 7-hole are also new. They, play a major part in the combustion process ultra-efficient, and improving the quality of emissions, by the fuel very homogeneously the combustion chamber. The result is even though the Audi A8 4.0 TDI – unlike its challengers has permanent four-wheel drive, it undercuts the limit values in the EU III standard.

What is more, the new common system is capable of injecting several times per combustion Single and double pilot produces a smoother combustion the benefits of this are most apparent in the engine’s acoustic The 4.0 TDI engine is not only much and smoother-running than its predecessor, it now serves as the benchmark in its class.

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