1NZ-FE Engine


toyota 1nz-fe engine

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Toyota 1NZ-FE is a 1.5 L (1,497 cc, 91.35 cu-in) inline-four four-stroke naturally aspirated gasoline engine, production of which was launched in 1999 at Kamigo Plant.

It keeps block of aluminum and cylinder head featuring double overhead camshaft and 4 valves for every cylinder. Compression index equals to 10.5. Cylinder bore is 75 millimeters (2.95 inches) while piston stroke is 84.7 millimeters (3.34 inches). This motor features electronic fuel injection system, VVT-i (Variable Valve Timing with intelligence) on the inlet part, ETCS-i (Electronic Throttle Control System with intelligence) plus DIS-4 ignition system with separate ignition coil for every spark plug.

1NZ-FE output is 109 hp (110 PS, 81 kW) at 6,000 rpm and a torque of 143 Nm (14.6 kg/m, 105.6 lb/ft) at 4,000 rpm.

1NZ-FE Engine Specs

The breakdown of the engine code is as follows:

  • 1 – 1-st generation engine
  • NZ – Engine family
  • F – Economy narrow-angle DOHC
  • E – Multi Point Fuel Injection
Engine Specifications
Engine code 1NZ-FE
Layout Four stroke, Inline-4 (Straight-4)
Fuel type Gasoline (petrol)
Production 1999-
Displacement 1.5 L, 1,497 cm3 (91.35 cu in)
Fuel system Electronic Fuel Injection (EFI)
Power adder None
Power output 110 PS (81 KW; 109 HP) at 6,000 rpm
Torque output 143 Nm (14.6 kg·m; 105.6 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 Head and Camshaft Characteristics

1NZ-FE gained aluminum cylinder head, containing a water jacket betwixt exhaust port and spark plug boss, helping to retain temperature necessary for combustion chamber wall. Double overhead camshafts were controlled by roller timing chain with an 8-millimeter pitch. Oil from oil jet got to timing chain, lubricating it.

Chain was supplied with chain tensioner, chain tension arm and chain guide to decrease motor sound and friction loss. Chain tensioner with a ratchet type non-return system kept chain tension using spring and oil pressure. Monoblock aluminum timing chain covering closed up cylinder block front and cylinder head. A gap was left in the cover for chain tensioner repairing.

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: 45.05-45.15 mm (1.774-1.778 in.)
Camshaft cam height: INTAKE 44.617-44.717 mm (1.7566-1.7605 in.)
EXHAUST 44.666-44.766 mm (1.7585-1.7624 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.)
Cylinder block
Cylinder block alloy Aluminium
Compression ratio: 10.5:1
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 0.030-0.070 mm (0.0012-0.0027 in)
Second 0.020-0.060 mm (0.008-0.0024 in)
Oil 0.070-0.150 mm (0.0027-0.0059 in)
Piston ring end gap: Top 0.25-0.35 mm (0.0098-0.0138 in)
Second 0.35-0.50 mm (0.0138-0.0197 in)
Oil 0.10-0.35 mm (0.0039-0.0138 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)

Applications

  • Toyota Vios/Belta
  • Toyota Yaris/Echo
  • Scion xA/ist
  • Scion xB (1st generation)/Toyota bB (1st generation)
  • Toyota Raum
  • Toyota Porte
  • Toyota Platz
  • Toyota Ist
  • Toyota Auris
  • Toyota Fun Cargo
  • Toyota Premio
  • Toyota Allion
  • Toyota Sienta
  • WiLL VS
  • Toyota Probox
  • Toyota Ractis
  • Toyota Corolla (Axio/Fielder, RunX, Allex)
  • Geely CK (Produced under license)
  • Geely MK (Produced under license)
  • Great Wall C10

VVT-i

1NZ-FE engine control unit counted favorable valve timing from motor and car speed, mass air flow, throttle location and water temperature inlets along with managing intake camshaft within the limits of 60 degrees of crankshaft angle. Thus, motor got valve overlap between -5 and 55 degrees. Additionally, motor gained intake duration of 225 degrees and exhaust duration of 224 degrees.

1NZ-FE problems and Engine Specs

  1. Excessive oil consumption. Having run for more than 100,000 miles (150,000 kilometers), 1NZ motors begin to consume lots of oil. It’s necessary to substitute valve stem seals plus piston rings.
  2. Motor tapping. Being also a common trouble of 1ZZ engine, it happens after engine runs more than 100,000-150,000 miles (150,000-200,000 kilometers) and means that timing chain is tense. To escape from knocking, acquire a fresh timing chain. Additionally, it’s advisable to examine timing chain tensioner.
  3. Rough idle. It’s reasonable to clean throttle body plus idle control valve.
  4. Motor whistling. Its reason is an outworn alternator belt, which is in need of thorough examination.
  5. High vibrations. Engine mounts, including anterior one, require examination. Besides, dirty injectors along with outwear fuel filter may cause vibrations. By cleaning injectors and placing a fresh filter, the problem will be solved.

Moreover, you may face troubles with oil pressure sensor malfunction and rear crankshaft oil seal leakage. As cylinder block isn’t subjected to repairs, it’s necessary to buy a new motor after 150,000 miles (200,000 kilometers) run.

To prevent the majority of these malfunctions, it’s required to buy only good quality oil, advised by Toyota. Besides, don’t forget to take care of it regularly.

Valve clearance
Intake valve 0.15-0.25 mm (0.006-0.010 in)
Exhaust valve 0.25-0.35 mm (0.010-0.014 in)
Compression pressure
Standard 15.0 kg/m2 (213 psi) / 200 rpm
Minimun 11.0 kg/m2 (156 psi) / 200 rpm
Compression differential limit between cylinders 0.06 kg/m2 (0.9 psi) / 200 rpm
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: K16R-11NGK: KBR5EYA-11
Spark plug gap 1.1 mm (0.043 in)

Dan Hoffman

Dan is a co-founder of Engineswork. He knows everything about internal combustion engines. Ask your questions in comments down below this article - he will be glad to help you anytime.

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