Opel Z18XER
The Opel Z18XER is a 1.8 l (1,796 cc, 109.6 cu-in) straight-four four-stroke natural aspirated gasoline engine from the third generation of GM Family 1. The engine was developed by Opel (a subsidiary of General Motors) and manufactured since 2005.
The Opel Z18XER engine uses a cast grey iron block with five-bearings crankshaft and aluminum head with dual overhead camshafts (DOHC) and four valves per cylinder (16 valves in total). The engine is equipped with a sequential fuel injection system, double continuous variable cam phasing (DCVCP) and electronic ignition system.
Cylinder bore and piston stroke are 80.5 mm (3.17 in) and 88.2 mm (3.47 in), respectively and compression ratio rating is 10.5:1. The Z18XER engine produces 140 PS (103 лW; 138 HP) at 6,300 rpm of maximum horsepower and 175 Nm (17.8 kg·m; 129.1 ft·lb) at 3,800 rpm of maximum torque. Redline is 6,500 rpm.
The breakdown of the engine code is as follows:
- Z – Euro 4 engine
- 18 – 1.8 Liter displacement
- X – Comression ratio from 10 to 11.5:1
- E – Multi Point Fuel Injection system
- R – Power is increased compared to Z18XE
General information
| Engine Specifications | |
| Engine code | Z18XER |
| Layout | Four stroke, Inline-4 (Straight-4) |
| Fuel type | Gasoline (petrol) |
| Production | 2005- |
| Displacement | 1.8 L, 1,796 cm 3 (109.6 cu in) |
| Fuel system | Sequential fuel injection |
| Power adder | None |
| Power output | 140 PS (103 KW; 138 HP) at 6,300 rpm |
| Torque output | 175 Nm (17.8 kg·m; 129.1 ft·lb) at 3,800 rpm |
| Firing order | 1-3-4-2 |
| Dimensions (L x W x H): | – |
| Weight | 119 kg (262 lbs) |
Cylinder block
The Z18XER cylinder block is based on the proven hollow-frame concept. Gray cast iron provides an extremely durable foundation, optimized with a deep skirt that minimizes both wear and vibration. Pistons apply a floating-pin design. The wrist pins, which attach the piston to the connecting rod, “float” inside the rod bushing and pin bores in the piston barrel. Pistons also have oil-spray cooling. Each piston has its own individual directed jet that sprays oil toward its skirt, coating its underside and the cylinder wall with an additional layer of lubricant.
| Cylinder block | ||
| Cylinder block alloy | Cast-iron | |
| Compression ratio: | 10.5:1 | |
| Cylinder bore: | 80.5 mm (3.17 in) | |
| Piston stroke: | 88.2 mm (3.47 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Cylinder inner diameter (standard): | 80.492-80.508 mm (3.169-3.1696 in) | |
| Piston skirt diameter (standard): | 80.455-80.465 mm (3.1675-3.1679 in) | |
| Piston pin outer diameter: | 19.000 mm (0.748 in) | |
| Piston ring side clearance: | Top | 0.040-0.080 mm (0.0016-0.0031 in) |
| Second | 0.030-0.070 mm (0.0012-0.0028 in) | |
| Oil | 0.030-0.130 mm (0.0012-0.0051 in) | |
| Piston ring end gap: | Top | 0.20-0.40 mm (0.0079-0.0157 in) |
| Second | 0.40-0.60 mm (0.0157-0.0236 in) | |
| Oil | 0.25-0.75 mm (0.0098-0.0295 in) | |
| Crankshaft journal diameter: | 54.980-54.997 mm (2.1646-2.1652 in) | |
| Crankpin diameter: | 42.971-42.987 mm (1.6918-1.6924 in) | |
- Step 1: 35 Nm (3.6 kg·m; 25.8 ft·lb)
- Step 2: Turn all bolts 45°
- Step 3: Turn all bolts 15°
- Step 1: 50 Nm (5.1 kg·m; 36.9 ft·lb)
- Step 2: Turn all bolts 45°
- Step 3: Turn all bolts 15°
Cylinder head
The cylinder head is made of an aluminum alloy. The Z18XER engine has Double Continuous Variable Cam Phasing (DCVCP) on the intake and exhaust sides. The camshafts are driven by timing belt. The engine has a composite intake manifold and fabricated stainless steel maniverter 4-1 with a close-coupled catalyst.
| Cylinder head (after 2006) | ||
| Valve Arrangement: | DOHC, belt driven | |
| Valves: | 16 (4 valves per cylinder) | |
| Valve head diameter: | INTAKE | 31.1-31.3 mm (1.2244-1.2323 in) |
| EXHAUST | 27.4-27.6 mm (1.0787-1.0866 in) | |
| Valve length: | INTAKE | 101.65 mm (4.002 in) |
| EXHAUST | 102.46 mm (4.034 in) | |
| Valve stem diameter: | INTAKE | 4.965-4.980 mm (0.1955-0.1961 in) |
| EXHAUST | 4.950-4.965 mm (0.1949-0.1955 in) | |
| Valve spring free length: | 41.6 mm (1.6378 in) | |
| Cam stroke: | INTAKE | 9.3 mm (0.3661 in) |
| EXHAUST | 8.3 mm (0.3268 in) | |
- Step 1: 25 Nm; 2.5 kg·m; 18.5 ft·lb)
- Step 2: Turn all bolts 90°
- Step 3: Turn all bolts 90°
- Step 4: Turn all bolts 90°
- Step 5: Turn all bolts 45°
Maintenance data
| Valve clearance (Cold) | |
| Intake valve | 0.21-0.29 mm (0.008-0.011 in) |
| Exhaust valve | 0.27-0.35 mm (0.010-0.014 in) |
| Compression pressure | |
| Standard | 16.0 kg/m 2 |
| Minimun | 14.0 kg/m 2 |
| Compression differential limit between cylinders | 0.1 kg/m 2 |
| Oil system | |
| Oil consumption , L/1000 km (qt. per miles) | up to 0.5 (1 qt. per 1200 miles) |
| Recommended engine oil | 0W-20, 5W-30 |
| Oil type | GM-LL-A-025 |
| Engine oil capacity (Refill capacity) | With filter change 4.5 l Without filter change 4.3 l |
| Oil change interval, km (miles) | 10,000 (6,000) |
| Ignition system | |
| Spark plug | Bosch: FQR8LEU2 |
| Spark plug gap | 0.85-0.95 mm (0.034-0.037 in) |
| Spark plug tightening torque | 25 Nm (2.55 kg·m; 18.45 ft·lb) |
Vehicle applications
| Model | Years Produced |
| Alfa Romeo 159 1.8 JTS | 2005-2010 |
| Fiat Croma 1.8 16v | 2005-2010 |
| Opel Astra H 1.8 16v | 2006-2010 |
| Opel Astra H 1.8 16v | 2006-2010 |
| Opel Vectra C 1.8 16v | 2005-2008 |
| Opel Signum 1.8 16v | 2006-2008 |
| Opel Zafira B 1.8 16v Ecotec | 2005-2010 |
Author: Sergei Wers About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.
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