The free-breathing 4.2 FSI is a high-performance engine such as can be found in racing. It delivers an experience that enthralls all of the senses - with spontaneous, voracious throttle response, with its easy revving, with hefty torque, prodigious power and sonorous, voluminous music.
The V8 accelerates the Audi R8 Spyder from zero to 100 km/h (62.14 mph) in 4.8 seconds and on up to a top speed of 300 km/h (185.79 mph). Both values apply for the manual transmission and for the R tronic. At Audi, dynamics also always means efficiency. The Audi R8 Spyder 4.2 FSI quattro with the R tronic
consumes on average 13.9 liters of fuel per 100 km (16.92 US mpg); fuel consumption with the manual transmission is 14.9 liters per 100 km (15.79 US mpg). A recuperation system that recovers energy during braking is standard. The forced oil pump of the dry sump lubrication system features various suction and discharge stages for load-dependent operation.
The 4.2 FSI produces 316 kW (430 hp) from a displacement of 4,163 cc - 73.5 kW (103.2 hp) per liter. At the nominal engine speed of 7,900 rpm, the long-stroke (bore x stroke 84.5 x 92.8 millimeters [3.33 x 3.65 in]) engine's eight pistons travel 24.1 meters (79 ft) each second. The electronic rev limiter kicks in at 8,250 rpm. The V8 delivers 430 Nm (317.15 lb-ft) of torque to the crankshaft between 4,500 and 6,000 rpm, with at least 90 percent of peak torque available between 3,500 and 7,500 rpm.
The compact V8, which is hand-assembled at the engine factory in Gy�r, Hungary, has the classic cylinder angle of 90 degrees and weighs just 216 kilograms (476 lb). Its crankcase is made of an aluminum-silicon alloy using the low-pressure die casting method, which ensures particular homogeneity. The high silicon
content makes the cylinder barrels extremely resistant to wear A bedplate structure gives the crankcase its high rigidity and optimal vibration behavior. The cast iron bearing bridges reduce its thermal expansion and thus keep the play at the main bearings of the crankshaft within tight limits. The forged crankshaft, the forged steel connecting rods and the forged aluminum pistons are extremely lightweight, yet strong. The dry sump lubrication system with its separate oil tank enables the engine to be installed very low while also ensuring the supply of oil to the engine even under extreme lateral acceleration
The high-revving V8 FSI draws its fuel from an FSI gasoline direct injection system - typically Audi. The common rail unit injects the fuel at up to 120 bars of pressure. The fuel mixture is swirled intensely in the combustion chambers and thus cools the walls. This allows a high compression of 12.5:1, for increased performance and efficiency. The 32 valves are actuated via roller cam followers by four camshafts, each of which can be moved through 42 degrees of crankshaft rotation. They and the ancillaries are driven by zero-maintenance chains running on the back side of the engine
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