Audi. Saturday , November 04th , 2017 - 11:58:17 AM
In the second generation of the Audi RS5 Coupe, Audi Sport is presenting its first model to feature the current RS design idiom. Its all-new 2.9 TFSI bi-turbo engine produces 331 kW (450 hp) and delivers 600 Nm (442.5 lb-ft) of torque. The standard quattro drive distributes the power to all four wheels.
The chain drive uses a new concept to reduce the drive power required: the crankshaft drives the balancer shaft via gears, with the shaft lying far down in the V of the cylinder banks. From here chains run to the four camshaft sprockets. These are trioval in shape, i.e. they have a slightly triangular shape, in order to compensate for peak forces. The balancer shaft rotates on roller bearings with particularly low levels of friction.
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.
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