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 |
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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