W12
A W12 is a 12-cylinder engine in a W configuration. Some prototype W12 engines have used three banks of 4 cylinders though none have ever gone into production. All production W12 engines to date (April, 2005) use four banks of three cylinders (two narrow-angle V6 engine blocks), coupled to a common crankshaft.
At the 2001 Tokyo Motor Show, Volkwagen showcased the W12 Coupe, a mid-engined, rear wheel drive supercar powered by a 6 litre W12 engine producing 600 hp. A week before, the W12 Coupe broke the world 24 hour endurance record. A total distance of 7085.7 kilometres (4402.8 miles) was covered at an average speed of 295.24 km/h (185.45 mph), breaking the old record by 12 km/h (7.5 mph). Production of the W12 Coupe was considered but is currently cancelled.
Volkswagen Group currently produces W12s, based on two of its narrow-angle VR6 engines. The narrow angle of each set of cylinders allows just two camshafts to drive each pair of banks, so just four are needed in total. Note that this design differs from the W18 that Volkswagen produced for its Bugatti concept cars of 1998 and 1999. Due to this distinction, the VW Group's W12 engine is sometimes described as a WR12.
The VW W12 is used in some high-end luxury models:
- Audi A8
- Bentley Continental GT
- Bentley Continental Flying Spur
- Volkswagen Phaeton
- Volkswagen Touareg
External links
Volkswagen's VR6 and W-engines
| Piston engine configurations | |
|---|---|
| Straight | Single, 2, 3, 4, 5, 6, 8, 9, 10, 12, 14 |
| V | 2, 4, 5, 6, 8, 10, 12, 16, 20, 24 |
| Flat | 2, 4, 6, 8, 10, 12, 16, H |
| W | 8, 9, 12, 16, 18 |
| Other inline | H, VR, Opposed, U (Square), X |
| Other | Hemi, Radial, Rotary, Pistonless, Deltic, (Wankel) |
| Heat engines | |
|---|---|
| Stroke cycles One • Two • Four • Six • | |
| Engine types Gas turbine • Piston • Jet • Rocket engine • Steam engine • Stirling engine • Tschudi• Twingle Rotary • Wankel • Free-piston • Britalus • Coomber • Swing-piston • Orbital • Quasiturbine | |
| Valves Cylinder head porting • D slide • Four-stroke • Manifold • Multi • Piston • Poppet • Sleeve | |
| Piston layouts Single cylinder • Straight • Opposed • Flat • V • W • H • Deltic • Radial • Rocket engine nozzle • Rotary • Stelzer • Controlled Combustion • Bourke | |
| Motion mechanisms Cam • Connecting rod • Coomber rotary • Crank • Crank substitute • Crankshaft • Linkages (Evans • Peaucellier-Lipkin • Sector straight-line • Watt) • Double acting/differential cylinder | |
| Thermodynamic cycle |