The Opel X16SZR is a 1.6 L (1,598 cc, 97.52 cu·in) straight-4 natural aspirated four-stroke water-cooled internal combustion gasoline engine, manufactured by Opel, a subsidiary of General Motors. The engine used on Opel/Vauxhall models, such as Astra, Vectra, and Zafira.
The Opel X16SZR engine has a cast-iron cylinder block, belt-driven single overhead camshaft (SOHC) and 8 valves (2 per cylinder). This engine used a single-point fuel injection system with GM Multec engine management system and electronic ignition system with the single ignition coil.
This engine produced 75 PS (55 kW; 74 HP) at 5,200 rpm of horsepower and 128 N·m (13.1 kg·m, 94.3 ft·lb) at 2,800 rpm of peak torque.
General information
| Engine Specifications | |
| Engine model | X16SZR |
| Production | 1996-2004 |
| Engine type | 4-stroke, SOHC, inline-4 |
| Displacement | 1.6 L, 1,598 cm3, (97.52 cu·in) |
| Max. horsepower | 75 PS (55 kW; 74 HP) at 5,200 rpm |
| Max. torque | 128 N·m (13.1 kg·m, 94.3 ft·lb) at 2,800 rpm |
| Ignition system | Electronic ignition system |
| Fuel system | Single-point fuel injection |
| Power adder | None |
| Firing order | 1-3-4-2 |
| Cooling system | Liquid-cooled |
| Lubricating system | Wet sump |
Cylinder Block
It has a 79.0 mm (3.11 in) cylinder bore and 81.5 mm (3.21 in) piston stroke. Compression ratio rating is 9.6:1. The engine used a cast-iron cylinder block, each piston is fitted with two compression rings and a single oil ring.
| Cylinder block | |
| Compression ratio: | 9.6:1 |
| Cylinder bore: | 79.0 mm (3.11 in) |
| Piston stroke: | 81.5 mm (3.21 in) |
| Cylinder internal diameter (standard): | 78.975-78.985 mm (3.1092-3.1096 in) |
| Piston skirt outer diameter (standard): | 78.955-78.965 mm (3.1085-3.1089 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Piston pin diameter: | 17.997-18.000 mm (0.7085-0.7087 in) |
| Side clearance (Top): | 0.020-0.040 mm (0.0008-0.0016 in) |
| Side clearance (Second): | 0.040-0.060 mm (0.0016-0.0024 in) |
| Side clearance (Oil): | 0.010-0.030 mm (0.0004-0.0012 in) |
| Ring end gap (Top): | 0.30-0.50 mm (0.0118-0.0197 in) |
| Ring end gap (Second): | 0.30-0.50 mm (0.0118-0.0197 in) |
| Ring end gap (Oil): | 0.40-1.4 mm (0.0157-0.0551 in) |
| Ring width (Top): | 1.2 mm (0.0472 in) |
| Ring width (Second): | 1.5 mm (0.0591 in) |
| Ring width (Oil): | 3.0 mm (0.1181 in) |
| Number of main bearings: | 5 |
| Crankshaft main bearing diameter: | 54.980-54.997 mm (2.1646-2.1652 in) |
| Crankpin bearing diameter: | 42.971-42.987 mm (1.6918-1.6924 in) |
| Crankshaft center distance: | 40.75 mm (1.605 in) |
Cylinder Head
The X16SZR engine has an aluminum head with 2 valves per cylinder (8 in total) and the single camshaft is driven by the crankshaft via a timing belt. Intake valves are 38.0 mm (1.4961 in) in diameter, and the exhaust valves are 31.0 mm (1.2205 in) in diameter. The engine used hydraulic tappets.
| Cylinder head | |
| Valve arrangement: | SOHC, belt driven |
| Valves: | 2 per cylinder (8 valves in total) |
| Head height: | 95.90-96.10 mm (3.7756-3.7835 in) |
| Valve head diameter (INTAKE): | 38.0 mm (1.4961 in) |
| Valve head diameter (EXHAUST): | 31.0 mm (1.2205 in) |
| Valve length (INTAKE): | 99.35 mm (3.9114 in) |
| Valve length (EXHAUST): | 99.65 mm (3.9232 in) |
| Valve steam diameter (INTAKE): | 6.998-7.012 mm (0.2755-0.2761 in) |
| Valve steam diameter (EXHAUST): | 6.978-6.992 mm (0.2747-0.2753 in) |
Tightening torque
| Tightening torque settings | |
| Connecting rod bolts |
Step 1: 25 N·m (2.5 kg·m, 18.4 ft·lb) Step 2: Turn all bolts: 30° |
| Crankshaft main 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° |
| Flywheel bolts |
Step 1: 35 Nm (3.57 kg·m; 25.83 ft·lb) Step 2: Turn all bolts: 30° Step 3: Turn all bolts: 15° |
| Cylinder head boltss |
Step 1: 25 N·m (2.5 kg·m, 18.4 ft·lb) Step 2: Turn all bolts: 85° Step 3: Turn all bolts another: 85° Step 4: Turn all bolts another: 20° |
Service Data
The ACEA A2-96 / A3-96 oil with a viscosity of 5W-30, 5W-40 or 5W-50 is recommended for the X16SZR, refilling oil capacity is 3.5 L (3.7 US. qt, 3.08 Imp. qt.). The recommended spark plug is BOSCH FLR8LD+U with 1.0 mm (0.0394 in) spark plug gap.
| Idle speed: | 620-920 rpm |
| Compression pressure | |
| Standard: | 15.0 bar (15.3 kg/cm2; 218 psi) |
| Minimum: | 12.0 bar (12.2 kg/cm2; 174 psi) |
| Compression differential limit between cylinders: | 1.0 bar (1.0 kg/cm2; 15 psi) |
| Oil type: | 5W-30, 5W-40, 5W-50 |
| Recommended oil: | ACEA A2-96 / A3-96 |
| Oil capacity: | 3.5 L (3.7 US. qt, 3.08 Imp. qt.) |
| Oil change interval: | 5,000 km (7,500 miles) |
| Fuel system | |
| Type: | Single-point fuel injection |
| Ignition system | |
| Type: | Electronic ignition system |
| Spark plug: | BOSCH FLR8LD+U |
| Spark plug gap: | 1.0 mm (0.0394 in) |
| Spark plug torque: | 25 N·m (2.5 kg·m, 18.4 ft·lb) |
Applications
| Model | Years Produced |
| Opel/Vauxhall Astra F | 1996-1998 |
| Opel/Vauxhall Astra G | 1998-2004 |
| Opel/Vauxhall Zafira A | 1998-2004 |
| Opel/Vauxhall Vectra B | 1996-2002 |
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