The 1UZ-FE engine has 8 cylinders in a V-arrangement with a 90 ° rake angle The 1UZ-FE features an aluminum cylinder block with a five bearing crankshaft and two aluminum cylinder heads with two camshafts ( DOHC) and four valves per cylinder (32 total). Until 1994, the Toyota 1UZ-FE engine was equipped with a multi-point fuel injection (MFI) system, and after 1994 it used sequential multi-point fuel injection (SFI). The latest engine versions (after 1997) were equipped with a VVTi (variable valve timing) system for the intake camshafts.
The cylinder bore and piston stroke are 87.5 mm (3.44 in) and 82.5 mm (3.25 in), respectively. The compression ratio ratio is 10.0: 1 (1989-1994), 10.4: 1 (1994-1997), and 10.5: 1 (after 1997).
The Toyota 1UZ-FE engine produced from 259 PS (191 kW; 256 HP) at 5,400 rpm to 300 PS (221 kW; 296 HP) at 6,000 rpm of peak power and from 333 Nm (34 kgm, 245, 4 ft · Lb) at 4,000 rpm up to 420 N · m (42.8 kg · m, 309.5 ft · lb) at 4,600 rpm of maximum torque depending on vehicle year and model.
The engine code breakdown is as follows:
- 1 – 1st generation engine
- UZ – Engine family
- F – Economical narrow angle DOHC
- me – Multi-point fuel injection
|Design||Four stroke, V8|
|Fuel type||Gasoline (gasoline)|
|Displacement||4.0 L, 3,968 cc (242.1 cu in)|
Before 1994: Multiport Fuel Injection (MFI)
After 1994: Sequential Multipoint Fuel Injection (SFI)
From 259 hp (191 kW; 256 hp) at 5400 rpm
From 333 Nm (34 kgm, 245.4 ftlb) @ 4,000 rpm
|Order to open fire||1-8-4-3-6-5-7-2|
|Dimensions (L x W x H):||–|
The 1UZ-FE engine has 8 V-cylinders arranged at a 90 ° bank angle. The aluminum alloy cylinder block. Cast iron cylinders are installed inside the cylinder block. The firing order for this engine is 1-8-4-3-6-5-7-2. The crankshaft is supported by five bearings inside the crankcase, these bearings are made of a copper-lead alloy. The crankshaft is integrated with 8 weights for balance.
The pistons are made of high-temperature resistant aluminum alloy and the vacuum is built into the piston head to avoid interference with the valves. The piston pins float completely. Each piston is equipped with two compression rings and a single oil ring. The upper compression ring is made of steel and the second ring is made of cast iron, the oil ring is made of a combination of steel and stainless steel.
The cylinder bore is 87.5 mm (3.44 in) and the piston stroke is 82.5 mm (3.25 in). The compression ratio rating is 10.5: 1, 10.4: 1, or 10: 1.
|Cylinder Block Alloy||Aluminum|
1989-1994: 10.0: 1
|Cylinder bore:||87.5 mm (3.44 inches)|
|Piston stroke:||82.5 mm (3.25 inches)|
|Number of piston rings (compression / oil):||2/1|
|Number of main bearings:||5|
|Cylinder bore (standard):||87.500-87.510 mm (3.4449-3.4453 inches)|
|Piston Skirt Diameter (Standard):||87.470-87.480 mm (3.4437-3.4441 inches)|
|Piston compression height:||–|
|Piston Pin Outside Diameter:||21.997-22.009 mm (0.866-0.8665 inches)|
|Connecting rod bushing inner diameter:||22.005-22.014 mm (0.8663-0.8667 inches)|
|Piston ring side clearance:||Top||0.020-0.060 mm (0.0008-0.0024 inch)|
|Second||0.015-0.055 mm (0.0006-0.0022 inch)|
|Piston Ring End Gap:||Top||0.250-0.450 mm (0.0098-0.0177 inch)|
|Second||0.350-0.600 mm (0.0138-0.0236 inch)|
|Petroleum||0.150-0.500 mm (0.0059-0.0197 inch)|
|Diameter of main crankshaft journal:||66.988-67.000 mm (2.6373-2.6378 inches)|
|Crankpin diameter:||51.982-52.000 mm (2.0465-2.0472 inches)|
Main bearing cap bolt tightening procedure and torque specifications:
- Step 1: 27 Nm; 2.7 kg · m; twenty…