The Toyota 1NZ-FXE is a 1.5 L (1,497 cc, 91.35 cu-in) hybrid straight-four 4-stroke natural aspirated gasoline engine from Toyota NZ-family.
The 1NZ-FXE engine features a lightweight aluminum block and aluminum cylinder head with two overhead camshafts (DOHC) and four valves per cylinder (16 in total). Toyota described the 1NZ-FXE engine as having an “Atkinson cycle” since the compression stroke is shortened and the expansion stroke longer. The engine has a high physical compression ratio of 13.0:1, but the closing of the inlet valve is delayed, for an effective compression ratio of 9.5:1 Cylinder bore and piston stroke are 75.0 mm (2.95 in) and 84.7 mm (3.34 in), respectively.
The 1NZ-FXE engine produced 76 PS (56 kW; 75 HP) at 5,000 rpm of maximum horsepower and 110 Nm (11.2 kg·m; 81.2 ft·lb) at 4,000 rpm of peak torque.
The breakdown of the engine code is as follows:
- 1 – 1-st generation engine
- NZ – Engine family
- F – Economy narrow-angle DOHC
- X – Hybrid Atkinson cycle
- E – Multi Point Fuel Injection
General information
| Engine Specifications | |
| Engine code | Toyota 1NZ-FXE |
| Layout | Four stroke, Inline-4 (Straight-4) |
| Fuel type | Gasoline (petrol) |
| Production | 1997- |
| Displacement | 1.5 L, 1,497 cm3 (91.35 cu in) |
| Fuel system | Electronic Fuel Injection (EFI) |
| Power adder | None |
| Power output | 76 PS (56 kW; 75 HP) at 5,000 rpm |
| Torque output | 110 Nm (11.2 kg·m; 81.2 ft·lb) at 4,000 rpm |
| Firing order | 1-3-4-2 |
| Dimensions (L x W x H): | – |
| Weight | 87 kg (191.2 lbs) |
Cylinder block
The Toyota 1NZ-FXE has an aluminum cylinder block with five bearing support system and thin-walled cast-iron liners. It has a 75.0 mm (2.95 in) cylinder bore and 84.7 mm (3.33 in) piston stroke. The engine has two compression and single oil control ring.
| Cylinder block | ||
| Cylinder block alloy | Aluminium | |
| Compression ratio: | 13.0-13.5:1 | |
| Cylinder bore: | 75.0 mm (2.95 in) | |
| Piston stroke: | 84.7 mm (3.34 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Number of main bearings: | 5 | |
| Cylinder inner diameter (standard): | 75.000-75.013 mm (2.9527-2.9528 in) | |
| Piston skirt diameter (standard): | 74.945-74.955 mm (2.9506-2.9510 in) | |
| Piston pin outer diameter: | 18.001-18.004 mm (0.7087-0.7088 in) | |
| Piston ring side clearance: | Top | 0.020-0.070 mm (0.0008-0.0027 in) |
| Second | 0.020-0.060 mm (0.0008-0.0024 in) | |
| Oil | 0.020-0.060 mm (0.0008-0.0024 in) | |
| Piston ring end gap: | Top | 0.20-0.30 mm (0.0079-0.0118 in) |
| Second | 0.30-0.45 mm (0.0118-0.0177 in) | |
| Oil | 0.10-0.40 mm (0.0039-0.0158 in) | |
| Crankshaft journal diameter: | 45.988-46.000 mm (1.8105-1.8110 in) | |
| Crankpin diameter: | 39.992-40.000 mm (1.5745-1.5748 in) | |
Main bearing cap bolts tightening procedure and torque specs:
- Step 1: 22 Nm; 2.2 kg·m; 16.2 ft·lb
- Step 2: Turn all bolts 90°
After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.
Connecting rod bearing bolts
- Step 1: 15 Nm; 1.5 kg·m; 11 ft·lb
- Step 2: Turn bolts 90°
Crankshaft pulley bolt
- 128 Nm; 13.0 kg·m; 94.5 ft·lb
Cylinder head
| Cylinder head | ||
| Valve Arrangement: | DOHC, chain drive | |
| Valves: | 16 (4 valves per cylinder) | |
| Valve head diameter: | INTAKE | 30.5 mm (1.20 in) |
| EXHAUST | 25.5 mm (1.00 in) | |
| Valve length: | INTAKE | 89.25 mm (3.5138 in) |
| EXHAUST | 87.90 mm (3.4606 in) | |
| Valve stem diameter: | INTAKE | 4.970-4.985 mm (0.1957-0.1963 in.) |
| EXHAUST | 4.965-4.980 mm (0.1955-0.1961 in.) | |
| Valve spring free length: | 59.77 mm (2.3531 in.) | |
| Camshaft cam height: | INTAKE | |
| EXHAUST | 44.046-44.146 mm (1.7341-1.7380 in.) | |
| Outer camshaft journal diameter: | №1 | 34.449-34.465 mm (1.3563-1.3569 in.) |
| Other journals diameter | 22.949-22.965 mm (0.9035-0.9041 in.) | |
Head tightening procedure and torque specs:
- Step 1: 29 Nm; 3.0 kg·m; 22 ft·lb
- Step 2: Turn all bolts 90°
- Step 3: Turn all bolts another 90°
Camshaft timing sprocket
Maintenance data
| Valve clearance | |
| Intake valve | 0.17-0.23 mm (0.007-0.009 in) |
| Exhaust valve | 0.27-0.33 mm (0.011-0.013 in) |
| Compression pressure | |
| Standard | 9.0 kg/m2 (128 psi) |
| Minimun | 7.0 kg/m2 (99 psi) |
| Compression differential limit between cylinders | 1.0 kg/m2 (14 psi) |
| Oil system | |
| Oil consumption , L/1000 km (qt. per miles) | up to 0.5 (1 qt. per 1200 miles) |
| Recommended engine oil | 5W-30, 10W-30 |
| Oil type API | SJ or higher |
| Engine oil capacity (Refill capacity) |
With filter change 3.4 l Without filter change 3,7 l |
| Oil change interval, km (miles) | 5,000-10,000 (3,000-6,000) |
| Ignition system | |
| Spark plug | DENSO: SK16R11, NGK: IFR5A11 |
| Spark plug gap | 1.0-1.1 mm (0.039-0.043 in) |
Vehicle applications
| Model | Years Produced |
| Toyota Prius | – |
| Toyota Prius C | – |
| Toyota Yaris | – |
| Toyota Corolla (Axio/Fielder) | – |
| Toyota Sienta | – |
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