The 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 code | Opel Z12XE |
Layout | Four stroke, Inline-4 (Straight-4) |
Fuel type | Gasoline (petrol) |
Production | 2000-2005 |
Displacement | 1.2 L, 1,199 cm3 (73.17 cu in) |
Fuel system | Multipoint fuel injection (MFI) |
Power adder | None |
Power output | 75 PS (55 kW; 73.8 HP) at 5,600 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 | – |
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 alloy | Cast-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: | INTAKE | 27.90-28.10 mm (1.0984-1.1062 in) |
EXHAUST | 24.90-25.10 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 plug | Bosch FQR8LEU2 |
Spark plug gap | 1.0 mm (0.0394 in) |
Spark plug tightening torque | 25 Nm (2.55 kg·m; 18.45 ft·lb) |
Vehicle applications
Model | Years Produced |
Opel / Vauxhall Agila A 1.2 16v | 2000-2004 |
Opel / Vauxhall Corsa C 1.2 16v | 2000-2004 |
Opel / Vauxhall Astra G 1.2 16v | 2000-2003 |
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.
Boas tenho um corca c 1.2 gasolina motor Z12XE e estava vendo aqui as especificaçoes e alem de estar muito bom o topico (https://www.engine-specs.net/opel/z12xe.html) queria lhes perguntar se voces teem mais especificado os apertos todos da cabeça do motor/arvores cames e componentes e da capa de distribuicao, ja tentei procurar em pdf apenas tenho uma imagem com os parafusos la mas nao tenho os apertos. Obrigado
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