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Toyota UR engine | |
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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-FE), 6000 (3UR-FE) |
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.[1] 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.