GM Family 0 engine

Family 0
Family 0 engine in an Opel Adam
Overview
Manufacturer	General Motors
Also called	Family Zero
Production	1996–present
Layout
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 material	Cast iron
Cylinder head material	Aluminium
Valvetrain	DOHC 4 valves x cyl. with VVT
Compression ratio	9.5:1, 10.1:1, 10.5:1
Combustion
Fuel system	Sequential MPFI
Fuel type	Gasoline, E85
Oil system	Wet sump
Cooling system	Water-cooled
Output
Power output	55–140 PS (40.5–103 kW)
Torque output	82–220 N⋅m (60–162 lb⋅ft)
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, at the time 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 (973 cc) straight-3 or 1.2 L (1,199 cc) straight-4; a 1.4 L (1,364 cc) I4 variant was added with the introduction of the second generation, replacing the 1.4 L Family 1 engine. The Family 0 engines were produced by Opel Wien in Vienna/Aspern (Austria), by GM in Bupyeong (Korea) and Flint (Michigan, USA).