Toyota UR engine
| Toyota UR engine | |
|---|---|
1UR-FSE engine in a Lexus GS460 | |
| Overview | |
| Manufacturer | Toyota Motor Corporation |
| Production | 2006–present |
| Layout | |
| Configuration | 90° V8 |
| Displacement | 4.6 L (4,608 cc) 5.0 L (4,969 cc) 5.7 L (5,663 cc) |
| Cylinder bore | 94 mm (3.7 in) |
| Piston stroke | 83 mm (3.27 in) 89.5 mm (3.52 in) 102 mm (4.02 in) |
| Cylinder block material | Die-cast aluminum |
| Cylinder head material | Aluminum |
| Valvetrain | DOHC 4 valves x cyl. w/VVT-i |
| Compression ratio | 10.2:1, 11.8:1, 12.3:1 |
| RPM range | |
| Max. engine speed | 7300 (2UR-GSE) 6000 (1UR-FE & 3UR-FE) 6600 (1UR-FSE & 2UR-FSE) 6800 (2UR-GSE in Lexus IS F) |
| Combustion | |
| Supercharger | Eaton Twin Vortices roots-type TRD kit (on some versions) |
| Fuel system | D-4S direct injection |
| Fuel type | Gasoline E85 Ethanol (only on 3UR-FBE) |
| Cooling system | Water cooled |
| Output | |
| Power output | 304–472 hp (227–352 kW; 308–479 PS) |
| Torque output | 44.8–55.4 kg⋅m (439–543 N⋅m; 324–401 lb⋅ft) |
| Dimensions | |
| Dry weight | 222 kg (489 lb) |
| Chronology | |
| Predecessor | Toyota UZ engine |
| Successor | Toyota V35A engine (V6, for 1UR & 3UR series) |
The Toyota UR engine family is a 32-valve dual overhead camshaft V8 piston engine series which was first introduced in 2006, as the UZ series it replaced began phasing out. Production started with the 1UR-FSE engine with D-4S direct injection for the 2007 Lexus LS. The series launched with a die-cast aluminum engine block, aluminum cylinder heads and magnesium cylinder head covers. All UR engines feature variable valve timing for both intake and exhaust cams or Dual VVT-i. Timing chains are used to drive the camshafts. The UR engine has been produced in 4.6, 5.0, and 5.7-liter displacement versions.