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W12 engine
The 6.0-liter W12 is a compact engine arrangement used in the Volkswagen / Audi AG vehicles, A8, Phaeton, and Continental GT and GTC. The "double-vee" arrangement allows for a small overall size in comparison with a tradition V- or Flat 12 engine. This engine made its debut in 1997 Volkswagen W12 Nardo concept supercar at the Tokyo Motor Show. The arrangement is also used in the 4.0-liter W8 used in the 2004-2006 Volkswagen Passat and the 8.0-liter W16 of the Bugatti Veyron 16.4.
Technical
The Nardo version of the W12 was 5.6-liters in displacement with a length of only 20.1 inches, and a width of 27.6 inches. It produced a claimed 420 hp @ 5800 RPM and 390 lb-ft of torque @ 3000 RPM.
The Volkswagen Phaeton W12 uses a detuned version of the A8 engine producing 444 hp @ 6000 RPM and 406 lb-ft of torque at 3250 RPM. The compression ratio is also lower at 10.5 : 1.
The Bentley Continental Flying Spur, Continental GT and Continental GTC all use a twin-turbocharged version producing 552 hp (560PS/411kW) @ 6100 RPM and 479 lb ft (650Nm) of torque @ 1600 RPM. The compression ratio of this version is 9.0 : 1.
The full specifications for the Audi A8L W12 are courtesy of the Audi Technical Specifications
A8L W12 |
|
Type |
DOHC aluminum allow 15-degree V-angle, 72-degree bank angle W12 |
Displacment |
6.0-Liters (366 cu. in.) |
Bore |
3.31 inches (84 mm) |
Stroke |
3.55 inches (90.2 mm) |
Compression Ratio |
11.0 : 1 |
Fuel Requirement |
Premium unleaded 91 AKI / 95 RON |
Horsepower (SAE) |
450 @ 6200 RPM |
Torque (lb-ft) |
428 @ 4000-4700 RPM |
Engine Design |
|
Cylinder Block |
Aluminum silicon alloy (Alusil) |
Crankshaft |
Forged, heat treated steel, 7 bearings. Offset crankpins. 21.2 kg |
Cylinder Head |
Aluminum Alloy |
Valvetrain/Intake |
DOHC, double overhead camshafts driven by a single chain, low friction roller cam followers, |
Firing Order |
1 - 12 - 5 - 8 - 3 -10 - 6 - 7 - 2 - 11 - 4 - 9 |
Cooling System |
Water-cooled, thermostatically controlled radiator fan. Water pump in cylinder block/crankcase |
Lubrication System |
gear pump, pressure lubrication, full flow through oil cooler |
Fuel Injection/ |
Fully electronic engine management system utilizing Bosch Motronic ME7.1.1, sequential injection with |
Emission System |
Air gap insulated exhaust manifolds, 4 close-coupled 3-way ceramic catalytic converters, 8 oxygen sensors |
Capacities |
|
Engine Oil |
13 qt. (12.5 l) |
Cooling System |
19.972 qt. (18.9 l) |