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Audi unleashes diesel brute

2007-03-08 15:31

The Audi Q7 4.2 TDI

Under the bonnet of the new Audi Q7 4.2 TDI is the most powerful diesel engine the brand has to offer.

The 4.2-litre capacity of the V8, which is already available in the A8, generates an output of 240 kW and 760 Nm of torque at engine speeds between 1 800 to 2 500 r/min.

This Q7 derivative accelerates from standstill to 100 km/h in 6.4 seconds and has a top speed of 236 km/h.

The Audi Q7 4.2 TDI transmits its power through a six-speed tiptronic gearbox and a sportily tuned quattro driveline, which in normal situations splits propulsive force 40 percent to the front wheels and 60 percent to the rear axle.

Audi's "adaptive air suspension" is standard on this most powerful of diesels - it unites dynamic handling with the ride comfort of the luxury class.

V-engine family

Like all the engines in the Audi Q7 series, the 8-cylinder diesel heralds from Audi's new V-engine family.

With a displacement of 4 134 cc, the large TDI has a maintenance-free chain drive on the gearbox side for its four camshafts and ancillaries.

The angle between the cylinder banks is 90 degrees, the cylinder spacing 90mm, the overall length just 520mm.

The crankcase is made of the high-tech material vermicular graphite cast iron. This forms the basis for the light weight of the engine - just 257kg.

The crankshaft is forged from chrome-molybdenum alloy steel while the cylinders are of cast aluminium.

Low-friction roller cam followers actuate the 32 valves; electronically actuated flaps give the intake air into a defined swirl.

Two turbochargers with variable-geometry turbines provide solid torque even at low engine speeds while still allowing a high power output. Large charge-air coolers reduce the temperature of the compressed air.

The common rail fuel injection system contains compact Piezo inline injectors that are extremely precise and fast switching. They are capable of up to five injection sequences per working cycle.

  • Audi South Africa told Wheels24 hat the Q7 4.2 TDI is under consideration for local introduction, however, it is subjected to fuel testing.
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