Audi. Saturday , November 04th , 2017 - 12:37:58 PM
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.
Hot-formed parts form the high-strength, crash-safe backbone of the occupant cell. They reinforce the transition from the front body to the interior, the front zone of the roof frame, the B-pillars, side sills and parts of the floor. The proportion of these parts in the body structure is 17 percent. A carbon roof with visible fiber structure is also available as an option, delivering a further weight saving of 3 kilograms (6.6 lb).
A further efficiency component of the 2.9 TFSI is the thermal management system. The crankcase and the cylinder head have separate coolant circuits. After a cold start, the switchable water pump controls the flow of coolant through the engine so that the oil is warmed up as quickly as possible. The exhaust manifolds are integrated in the cylinder head, and coolant circulates around them which helps ensure rapid warming up. When the engine is warm, this technology lowers the exhaust temperatures - consumption drops drastically, especially when driving in a sporty way. The great efficiency of the V6 bi-turbo is also partly to do with low friction. For example, the fully adjustable oil pump only builds up as much pressure as necessary.
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