Z12XE

Family 0
Family 0 engine in an Opel Adam
Overview
Manufacturer	General Motors
Also called	Family Zero
Production	1996–present
Combustion chamber
Configuration	Straight-3 Straight-4
Displacement	973 cc (59.4 cu in) 998 cc (60.9 cu in) 1,199 cc (73.2 cu in) 1,229 cc (75.0 cu in) 1,364 cc (83.2 cu in) 1,398 cc (85.3 cu in)
Cylinder bore	72.5 mm (2.85 in) 73.4 mm (2.89 in)
Piston stroke	72.6 mm (2.86 in) 78.6 mm (3.09 in) 80.6 mm (3.17 in) 82.6 mm (3.25 in)
Cylinder block alloy	Cast iron
Cylinder head alloy	Aluminium
Valvetrain	Dual overhead cam
Compression ratio	9.5:1 10.1:1 10.5:1
Combustion
Fuel system	Sequential multi-port fuel injection
Fuel type	Gasoline E85
Oil system	Wet sump
Cooling system	Water-cooled
Chronology
Predecessor	Opel OHV engine GM Family 1 engine (1.0 – 1.4L)
Successor	Small Gasoline Engine

The Family 0 is a family of inline piston engines that was developed by Opel, a subsidiary of General Motors, as a low-displacement engine for use on entry-level subcompact cars from Opel/Vauxhall.

These engines feature a light-weight cast-iron semi-closed deck engine block with an aluminum cylinder head. The valvetrain consists of chain-driven hollowcast dual overhead camshafts (DOHC) that actuate 4-valves per cylinder via roller finger followers with hydraulic tappets. These engines also feature a 78 mm (3.1 in) bore spacing and fracture-split connecting rods.

Later versions also incorporate a variable length intake manifold (VLIM) and variable valve timing (VVT).

Originally debuting as either a 1.0 L straight-3 or 1.2 L straight-4; a 1.4 L I4 variant was added with the introduction of the second generation, replacing the 1.4 L Family 1 engine. Currently, the Family 0 engines are produced by Opel Wien in Vienna/Aspern (Austria), by GM in Bupyeong (Korea) and Flint (Michigan, USA).

The engine was first introduced in 1996 Opel Corsa, either as a three-cylinder or as a four-cylinder version. This was Opel's first three-cylinder engine.