GM Family 0 engine

Family 0
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).