Toyota 1NZ-FXE

Toyota 1NZ-FXEThe 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 codeToyota 1NZ-FXE
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Production1997-
Displacement1.5 L, 1,497 cm3 (91.35 cu in)
Fuel systemElectronic Fuel Injection (EFI)
Power adderNone
Power output76 PS (56 kW; 75 HP) at 5,000 rpm
Torque output110 Nm (11.2 kg·m; 81.2 ft·lb) at 4,000 rpm
Firing order1-3-4-2
Dimensions (L x W x H):
Weight87 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 alloyAluminium
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:Top0.020-0.070 mm (0.0008-0.0027 in)
Second0.020-0.060 mm (0.0008-0.0024 in)
Oil0.020-0.060 mm (0.0008-0.0024 in)
Piston ring end gap:Top0.20-0.30 mm (0.0079-0.0118 in)
Second0.30-0.45 mm (0.0118-0.0177 in)
Oil0.10-0.40 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:INTAKE30.5 mm (1.20 in)
EXHAUST25.5 mm (1.00 in)
Valve length:INTAKE89.25 mm (3.5138 in)
EXHAUST87.90 mm (3.4606 in)
Valve stem diameter:INTAKE4.970-4.985 mm (0.1957-0.1963 in.)
EXHAUST4.965-4.980 mm (0.1955-0.1961 in.)
Valve spring free length:59.77 mm (2.3531 in.)
Camshaft cam height:INTAKE
EXHAUST44.046-44.146 mm (1.7341-1.7380 in.)
Outer camshaft journal diameter:№134.449-34.465 mm (1.3563-1.3569 in.)
Other journals diameter22.949-22.965 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 valve0.17-0.23 mm (0.007-0.009 in)
Exhaust valve0.27-0.33 mm (0.011-0.013 in)
Compression pressure
Standard9.0 kg/m2 (128 psi)
Minimun7.0 kg/m2 (99 psi)
Compression differential limit between cylinders1.0 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 oil5W-30, 10W-30
Oil type APISJ 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 plugDENSO: SK16R11, NGK: IFR5A11
Spark plug gap1.0-1.1 mm (0.039-0.043 in)

Vehicle applications

ModelYears Produced
Toyota Prius
Toyota Prius C
Toyota Yaris
Toyota Corolla (Axio/Fielder)
Toyota Sienta
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