Opel Z12XE

Opel Z12XEThe Opel Z12XE is a 1.2 l (1,199 cc, 73.17 cu-in) straight-four 4-stroke natural aspirated gasoline small-displacement engine developed by Opel, at the time a subsidiary of General Motors. The engine was manufactured from 2000 to 2005.

The Z12XE engine uses a light-weight cast-iron semi-closed deck engine block with a cast-iron crankshaft and aluminum head with dual chain-driven overhead camshafts (DOHC) and four valves per cylinder (16 valves in total). The Z12XE engine is a Euro 4 version of the X12XE engine with Bosch Motronic ME 1.5.5.

Bore and stroke are 72.5 mm (2.85 in) and 72.6 mm (2.86 in), respectively. Compression ratio rating is 10.1:1. The Z12XE engine produces 75 PS (55 kW; 73.8 HP) at 5,600 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:

  • Z – Euro 4 engine
  • 12 – 1.2 Liter displacement
  • X – Comression ratio from 10 to 11.5:1
  • E – Multi Point Fuel Injection system

General information

Engine Specifications
Engine codeOpel Z12XE
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Production2000-2005
Displacement1.2 L, 1,199 cm3 (73.17 cu in)
Fuel systemMultipoint fuel injection (MFI)
Power adderNone
Power output75 PS (55 kW; 73.8 HP) at 5,600 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):
Weight

Cylinder block

The engine used a cast-iron semi-closed deck cylinder block and a cast-iron crankshaft five-bearings supported system. Bore and stroke are 72.5 mm (2.85 in) and 78.6 mm (3.09 in). Compression ratio rating is 10.1:1.

Cylinder block
Cylinder block alloyCast-iron
Compression ratio:10.1:1
Cylinder bore:72.5 mm (2.85 in)
Piston stroke:72.6 mm (2.86 in)
Number of piston rings (compression / oil):2 / 1

Cylinder head

The cylinder head is made of an aluminum alloy. The X12XE engine has chain-driven dual overhead camshafts. Valves are actuated via roller finger followers with hydraulic tappets.

Cylinder head
Cylinder head alloy:Aluminium
Valve Arrangement:DOHC, chain-driven
Valves:16 (4 valves per cylinder)
Valve timing:INTAKE
EXHAUST
Valve head diameter:INTAKE27.90-28.10 mm (1.0984-1.1062 in)
EXHAUST24.90-25.10 mm (0.9803-0.9880 in)

Head tightening procedure and torque specs:

  • Step 1: 25 Nm (2.5 kg·m, 18.4 ft·lb)
  • Step 2: Turn all bolts 60°
  • Step 3: Turn all bolts 60°
  • Step 4: Turn all bolts 60°

Maintenance data

Oil system
Oil consumption , L/1000 km (qt. per miles)up to 0.5 (1 qt. per 1200 miles)
Recommended engine oil 5W-30, 5W-40, 10W-30, 10W-40
Oil type API SG / CD
CCMC G4 / G5
Engine oil capacity (Refill capacity) With filter change 3.5 l
Oil change interval, km (miles)30,000 (18,000)
Ignition system
Spark plugBosch FQR8LEU2
Spark plug gap1.0 mm (0.0394 in)
Spark plug tightening torque25 Nm (2.55 kg·m; 18.45 ft·lb)

Vehicle applications

ModelYears Produced
Opel / Vauxhall Agila A 1.2 16v2000-2004
Opel / Vauxhall Corsa C 1.2 16v2000-2004
Opel / Vauxhall Astra G 1.2 16v2000-2003
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

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