The Toyota 1UR-FE is a 4.60 l (4,608 cc, 281.2 cu-in) V8, four-stroke cycle water-cooled naturally aspirated internal combustion gasoline engine, from the UR-family, manufactured by the Toyota Motor Corporation since 2006.
The 1UR-FE engine has 8 cylinders in a V-arrangement at a bank angle of 90° The 1UR-FE features die-cast aluminum cylinder block t with a five-bearings crankshaft and two aluminum heads with two camshafts (DOHC) and four valves per cylinder (32 in total). The Toyota 1UR-FE engine is equipped with L-type sequential fuel injection (SFI) system, Direct Ignition System (DIS) ignition system with individual coils on each spark plug, Acoustic Control Induction System (ACIS), Electronic Spark Advance (ESA) and ETCS-i (Electronic Throttle Control System-intelligent). The engine also used a Dual VVT-i (Variable Valve Timing) system for the intake and exhaust camshafts. For reducing emission this engine used the water-cooled Exhaust Gas Recirculation (EGR) system and the air injection system for the faster warm-up of the catalytic converters.
A 94.0 mm (3.7 in) cylinder bore and 83.0 mm (3.27 in) piston stroke give the Toyota 1UR-FE motor a total 4.60 l of displacement. Compression ratio rating is 10.2:1.
This engine produced from 296 PS (218 kW; 292 HP) at 5,500 rpm to 347 PS (255 kW; 342 HP) at 6,400 rpm of maximum power and from 439 Nm (44.8 kg·m; 324 ft·lb) at 3,500 rpm to 460 Nm (46.9 kg·m; 339.5 ft·lb) at 4,100 rpm of peak torque depending on year and vehicle model.
The breakdown of the engine code is as follows:
- 1 – 1st generation engine
- UR – Engine family
- F – Economy narrow-angle DOHC
- E – Multi Point Fuel Injection
|Layout||Four stroke, V8|
|Fuel type||Gasoline (petrol)|
|Displacement||4.6 L, 4,608 cm2 (281.2 cu in)|
|Fuel system||Sequential multi-point fuel injection (SFI)|
From 296 PS (218 kW; 292 HP) at 5,500 rpm|
to 347 PS (255 kW; 342 HP) at 6,400 rpm
From 439 Nm (44.8 kg·m; 324 ft·lb) at 3,500 rpm|
to 460 Nm (46.9 kg·m; 339.5 ft·lb) at 4,100 rpm
|Dimensions (L x W x H):||–|
|Weight||216 kg (476 lb)|
The 1UR-FE engine has a die-cast aluminum cylinder block in a V arrangement at a bank angle of 90°. This engine’s firing order is 1-8-7-3-6-5-4-2. The crankshaft is supported by 5 bearings. These bearings are made of aluminum alloy. The engine is equipped with forged steel crankshaft with five journals and six balance weights.
The 1UR-FE engine used forged connecting rods with resin-coated aluminum bearings. Pistons are made of high temperature-resistant aluminum alloy and they are cooled by four oil jets in the cylinder block. Piston pins are the full-floating type.
To reduce friction, the piston skirts have a resin coating, while the top compression ring and oil ring have a Physical Vapor Deposition (PVD) coating. The Toyota 1UR-FE motor has two compression and one oil control rings.
Bore and stroke are 94.0 mm (3.7 in) and 83.0 mm (3.27 in), respectively. Compression ratio rating is 10.2:1.
|Cylinder block alloy||Die-cast aluminum|
|Cylinder bore:||94.0 mm (3.7 in)|
|Piston stroke:||83.0 mm (3.27 in)|
|Number of piston rings (compression / oil):||2 / 1|
|Number of main bearings:||5|
|Cylinder inner diameter (standard):||94.000-94.012 mm (3.700-3.701 in)|
|Piston skirt diameter (standard):||93.980-93.990 mm (3.7000-3.7004 in)|
|Piston pin outer diameter:||21.998-22.007 mm (0.8660-0.8664 in)|
|Connecting rod bushing inner diameter:||22.005-22.014 mm (0.8663-0.8667 in)|
|Connecting rod big end diameter:||50.000-55.006 mm (1.9685-2.1656 in)|
|Piston ring side clearance:||Top||0.020-0.070 mm (0.0008-0.027 in)|
|Second||0.020-0.060 mm (0.0008-0.0024 in)|
|Oil||0.010-0.040 mm (0.0039-to 0.0157 in.)|
|Piston ring end gap:||Top||0.23-0.33 mm (0.0090-0.0130 in)|
|Second||0.40 to 0.50 mm (0.0157-0.0197 in)|
|Oil||0.10 to 0.40 mm (0.0040-0.0157 in)|
|Crankshaft main journal diameter:||66.988-67.000 mm (2.6373-2.6378 in)|
|Crankpin diameter:||52.982-53.000 mm (2.0859-2.0866 in.)|
Main bearing cap bolts tightening procedure and torque specs:
- Step 1: Inside: 61 Nm; 6.2 kg·m; 45 ft·lb
Outside: 27 Nm; 2.7 kg·m; 20 ft·lb
- Step 2: Turn bolts 90°
- Cylinder block side 45 Nm; 4.6 kg·m; 33 ft·lb
After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.
Connecting rod bearing bolts
- Step 1: 40 Nm; 4.0 kg·m; 30 ft·lb
- Step 2: Turn bolts 90°
The cylinder heads are made of aluminum alloy. The 1UR-FE engine has dual overhead camshafts design (DOHC) with four valves per cylinder (2 intakes and 2 exhaust). The 1UR-FE engine used primary timing chains for the intake camshafts and each exhaust camshaft is driven by a secondary timing chain from the intake camshaft. The 1UR-FE engine had Dual VVT-i to control the intake and exhaust camshafts.
The intake valve head diameter is 38.0 mm (1.496 in) and the exhaust valve diameter is 34.5 mm (1.260 in). Intake duration was 232 degrees and exhaust duration was 234 degrees. For valve clearance adjustment this engine used hydraulic lash adjuster which is actuated by engine oil supplied from the cylinder head and an integrated spring.
|Block head alloy||Aluminium|
|Valve Arrangement:||DOHC, chain drive|
|Cylinder head height:||–|
|Valves:||32 (4 valves per cylinder)|
|Intake valve timing:||232°|
|Exhaust valve timing:||234°|
|Valve head diameter:||INTAKE||38.0 mm (1.496 in)|
|EXHAUST||34.5 mm (1.260 in)|
|Valve length:||INTAKE||105.85 mm (4.17 in)|
|EXHAUST||110.40 mm (4.35 in)|
|Valve stem diameter:||INTAKE||5.470-5.485 mm (0.215-0.216 in)|
|EXHAUST||5.465-5.480 mm (0.2152-0.2157 in)|
|Valve spring free length:||INTAKE||51.59 mm (2.03 in)|
|EXHAUST||51.59 mm (2.03 in)|
Head tightening procedure and torque specs:
- Step 1: 36 Nm; 3.67 kg·m; 27 ft·lb
- Step 2: Turn all bolts 90°
- Step 3: Turn all bolts another 90°
- For 12 mm head: 21 Nm; 2.14 kg·m; 15 ft·lb
|Standard||13.3 kg/cm2, (189 psi) / 300 rpm|
|Minimun||10.2 kg/cm2, (145 psi) / 300 rpm|
|Compression differential limit between cylinders||1.0 kg/cm2, (15 psi) / 300 rpm|
|Oil consumption , L/1000 km||up to 1.0|
|Recommended engine oil||5W-30|
|Oil type API||SL or SJ|
|Engine oil capacity (Refill capacity)||
With filter change 6.4-6.8 liters|
Without filter change 5.7-6.4 liters, depending on year and vehicle model.
|Oil change interval, km (miles)||8,000 (5,000)|
Idle speed: 70 kPa (0.7 kgf/cm 2 , 10.1 psi) or more|
2,500 rpm: 220 kPa (2.2 kgf/cm 2 , 32 psi) or more
|Spark plug||DENSO: SK20R11.|
|Spark plug gap||1.0-1.1 mm (0.0394-0.0433 in.)|
|Spark plug tightening torque||21 Nm (2.14 kg⋅m, 15 ft⋅lb)|
|Lexus LS 460 & LS 460 L||2006–2017|
|Lexus GS 460||2005–2011|
|Lexus GX 460||2009–|
|Toyota Land Cruiser||2012|