The Opel Z18XER is a 1.8 L (1,796 cc, 109.6 cu·in) straight-4 natural aspirated four-stroke liquid-cooled internal combustion vertical gasoline engine from the 3-rd generation of GM Family 1. This engine was developed by Opel (a subsidiary of General Motors) and manufactured since 2005.
The Opel Z18XER engine used a cast-iron cylinder 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. Redline is 6,500 rpm.
This engine produced 140 PS (103 kW; 138 HP) at 6,300 rpm of horsepower and 175 N·m (17.8 kg·m, 129 ft·lb) at 3,800 rpm of torque.
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 model | Opel Z18XER |
| Engine type | 4-stroke, DOHC, straight-4 |
| Displacement | 1796 cm3, (109.6 cu·in) |
| Max. horsepower | 140.1 PS (103 kW; 138.1 HP) at 6,300 rpm |
| Max. torque | 175 N·m (17.8 kg·m, 129 ft·lb) at 3,800 rpm |
| Cooling system | Liquid-cooled |
| Lubricating system | Pressure feed |
| Ignition system | Electronic Ignition System |
| Fuel system | Sequential fuel injection |
| Charging system | Alternator 12V 100 Amp |
| Firing order: | 1-3-4-2 |
| Dimensions (L X H) | 513 x 420 mm (20.2 x 16.5 in) |
| Dry weight | 119 kg (262.3 lbs) |
Cylinder Block
The Opel Z18XER3 has a cars-iron cylinder block with cast iron crankshaft. The cylinder block is based on the proven hollow-frame concept. It has an 80.5 mm (3.17 in) cylinder bore and 88.2 mm (3.47 in) piston stroke. Compression ratio rating is 10.5:1.
Pistons apply a floating-pin design. The Opel Z18XER motor has an aluminum alloy piston for high strength with two compression and single oil control rings. Connecting rods are made of forged steel.
| 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) |
| Cylinder internal diameter (standard): | 80.492-80.508 mm (3.169-3.1696 in) |
| Piston skirt outer diameter (standard): | 80.455-80.465 mm (3.1675-3.1679 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Piston pin diameter: | 19.000 mm (0.748 in) |
| Side clearance (Top): | 0.040-0.080 mm (0.0016-0.0031 in) |
| Side clearance (Second): | 0.030-0.070 mm (0.0012-0.0028 in) |
| Side clearance (Oil): | 0.030-0.130 mm (0.0012-0.0051 in) |
| Ring end gap (Top): | 0.20-0.40 mm (0.0079-0.0157 in) |
| Ring end gap (Second): | 0.40-0.60 mm (0.0157-0.0236 in) |
| Ring end gap (Oil): | 0.25-0.75 mm (0.0098-0.0295 in) |
| Number of main bearings: | 5 |
| Crankshaft main journal diameter: | 54.980-54.997 mm (2.1646-2.1652 in) |
| Crankpin journal diameter: | 42.971-42.987 mm (1.6918-1.6924 in) |
| Crankshaft center distance: | 44.1 mm (1.735 in) |
Cylinder head
The cylinder head is made of strong, light aluminium alloy which gives it good cooling efficiency. The Z18XER has double continuous variable cam phasing (DCVCP) system. The camshaft is driven by the timing belt.
This engine has dual overhead camshafts and 16 valves, 4 per cylinder. Camshafts are made of the cast chilled iron. The intake valve diameter is 31.0 mm (1.22 in), valve lift is 9.3 mm (0.37 in); the exhaust valve diameter is 27.5 mm (1.08 in), valve lift is 8.3 mm (0.33 in).
| Cylinder head | |
| Cylinder head alloy: | Aluminium |
| Valve arrangement: | DOHC, belt driven |
| Valves:: | 4 per cylinder, (16 valves in total) |
| Valve head diameter (INTAKE): | 31.1-31.3 mm (1.2244-1.2323 in) |
| Valve head diameter (EXHAUST): | 27.4-27.6 mm (1.0787-1.0866 in) |
| Valve steam diameter (INTAKE): | 4.965-4.980 mm (0.1955-0.1961 in) |
| Valve steam diameter (EXHAUST): | 4.950-4.965 mm (0.1949-0.1955 in) |
| Valve spring free length (INTAKE): | 41.6 mm (1.6378 in) |
| Valve spring free length (EXHAUST): | 41.6 mm (1.6378 in) |
| Camshaft lobe height (INTAKE): | 9.3 mm (0.3661 in) |
| Camshaft lobe height (EXHAUST): | 8.3 mm (0.3268 in) |
Tightening torque
| Tightening procedure and torque specs | |
| Connecting rod bearing cap bolts | Step 1: 35 Nm (3.6 kg·m; 25.8 ft·lb) Step 2: Turn all bolts 45° Step 3: Turn all bolts 15° |
| Crankshaft bearing cap bolts | 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 | 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° |
Service Data
The GM-LL-A-025 engine oil with a viscosity of SAE 0-W30, 0-W40, 5-W30 and 5-W40 is recommended for the Z18XER, refilling oil capacity is 4.5 L (4.76 US. qt, 3.96 Imp. qt.). Recommended spark plug is FQR8LEU2 with 0.85-0.95 mm (0.0335-0.0374 in) spark plug gap.
The valve clearance is 0.20-0.30 mm (0.0079-0.0118 in) for intake valves and 0.25-0.35 mm (0.0098-0.0138 in) for exhaust valves. Standard cylinder compression is 16.0 bar (16.3 kg/cm2; 232 psi).
| Engine | |
| Maximum speed: | 6,500 rpm |
| Idle speed: | 780-1,000 rpm |
| Compression pressure | |
| Standard: | 16.0 bar (16.3 kg/cm2; 232 psi) |
| Minimum: | 14.0 bar (14.3 kg/cm2; 203 psi) |
| Compression differential limit between cylinders: | 1.0 bar (1 kg/m2; 15 psi) |
| Valve clearance | |
| Intake valve clearance: | 0.20-0.30 mm (0.0079-0.0118 in) |
| Exhaust valve clearance : | 0.25-0.35 mm (0.0098-0.0138 in) |
| Oil system | |
| Lubrication system: | Pressure feed |
| Oil consupumtion: | 0.6 m per 1,000 km |
| Oil type: | GM-LL-A-025 |
| Recommended oil: | 0-W30, 0-W40, 5-W30 and 5-W40 |
| Oil capacity: | 4.5 L (4.76 US. qt, 3.96 Imp. qt.) |
| Fuel system | |
| Type: | Sequential fuel injection |
| Ignition system | |
| Type: | Electronic Ignition System |
| Spark plug: | FQR8LEU2 |
| Spark plug gap: | 0.85-0.95 mm (0.0335-0.0374 in) |
| Spark plug torque: | 25 N·m (2.5 kg·m, 18.4 ft·lb) |
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 |
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