Opel X16SZR

Opel X16SZRThe Opel Opel X16SZR is a 1.6 l (1,598 cc, 97.52 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).

The Opel X16SZR engine uses a cast-iron block with five-bearings crankshaft and aluminum head with single overhead camshafts (SOHC) and two valves per cylinder (8 valves in total). The engine is equipped with a single-point fuel injection system.

Cylinder bore and piston stroke are 79.0 mm (3.11 in) and 81.5 mm (3.21 in), respectively and compression ratio rating is 9.6:1. The X16SZR engine produces 75 PS (55 kW; 74 HP) at 5,200 rpm of maximum horsepower and 128 N·m (13.1 kg·m, 94.3 ft·lb) at 2,800 rpm of maximum torque.

The breakdown of the engine code is as follows:

  • X – Euro 2 engine
  • 16 – 1.6 Liter displacement
  • S – Comression ratio from 9.5:1 to 10:1
  • Z – Single Point Fuel Injection system
  • R – Power is increased compared to X16SZ

General information

Engine Specifications
Engine codeX16SZR
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Displacement1.6 L, 1,598 cm3 (97.52 cu in)
Fuel systemSingle-point fuel injection system
Power adderNone
Power output75 PS (55 kW; 74 HP) at 5,200 rpm
Torque output128 N·m (13.1 kg·m, 94.3 ft·lb) at 2,800 rpm
Firing order1-3-4-2
Dimensions (L x W x H):

Cylinder block

Cylinder block
Cylinder block alloyCast-iron
Compression ratio:9.6:1
Cylinder bore:79.0 mm (3.11 in)
Piston stroke:81.5 mm (3.21 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter (standard):78.975-78.985 mm (3.1092-3.1096 in)
Piston skirt diameter (standard):78.955-78.965 mm (3.1085-3.1089 in)
Piston pin outer diameter:17.997-18.000 mm (0.7085-0.7087 in)
Piston ring side clearance:Top0.020-0.040 mm (0.0008-0.0016 in)
Second0.040-0.060 mm (0.0016-0.0024 in)
Oil0.010-0.030 mm (0.0004-0.0012 in)
Piston ring end gap:Top0.30-0.50 mm (0.0118-0.0197 in)
Second0.30-0.50 mm (0.0118-0.0197 in)
Oil0.40-1.4 mm (0.0157-0.0551 in)
Connecting rod center distance:
Crankshaft bearing journal diameter:54.980-54.997 mm (2.1646-2.1652 in)
Crankpin bearing diameter:42.971-42.987 mm (1.6918-1.6924 in)

Cylinder head

The cylinder head is made of an aluminum alloy. The X16SZR engine has single overhead camshaft, which is driven by 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.

Cylinder head
Valve Arrangement:SOHC, belt drive
Cylinder head height:95.90-96.10 mm (3.7756-3.7835 in)
Valves:8 (2 valves per cylinder)
Valve timing:INTAKE
Valve head diameter:INTAKE38.0 mm (1.4961 in)
EXHAUST31.0 mm (1.2205 in)

Head tightening procedure and torque specs:

  • Step 1: 25 N·m (2.5 kg·m, 18.4 ft·lb)
  • Step 2: Turn all bolts 85°
  • Step 3: Turn all bolts 85°
  • Step 4: Turn all bolts 20°

Maintenance data

Compression pressure
Standard15.3 kg/cm2
Minimun12.2 kg/cm2
Compression differential limit between cylinders1.0 kg/cm2
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, 5W-50
Oil typeACEA A2-96 / A3-96
Engine oil capacity (Refill capacity) With filter change 3.5 L (3.7 US. qt, 3.08 Imp. qt.)
Oil change interval, km (miles)7,500 (5,000)
Ignition system
Spark plugBosch: LR8LD+U
Spark plug gap1.0 mm (0.0394 in)
Spark plug tightening torque25 Nm (2.55 kg·m; 18.45 ft·lb)

Vehicle applications

ModelYears Produced
Opel/Vauxhall Astra
Opel/Vauxhall Zafira
Opel/Vauxhall Vectra
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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  1. I am looking for a used or refurbished Opel Vectra engine X16SZR(1.6L,SOHC)to replace in my Opel Vectra.

    I will be glad to know the price of engine and shipping to Tema.

    Kind regards.

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