GM Family 0 engine


The Family 0 is a family of inline piston engines that was developed by Opel, at the time a subsidiary of General Motors. It was developed 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 that actuate 4-valves per cylinder via roller finger followers with hydraulic tappets. These engines also feature a bore spacing and fracture-split connecting rods.
Later versions also incorporate a variable length intake manifold and variable valve timing.
Originally debuting as either a straight-3 or straight-4; a 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, by GM in Bupyeong and Flint.

Generation I

The engine was first introduced in the 1996 Opel Corsa, either as a three-cylinder or as a four-cylinder version. This was Opel's first three-cylinder engine.
NameDisplacementConfigurationBoreStrokeCompression RatioPowerTorque
X10XEI310.1:1 at 2800 rpm
Z10XEI3
X12XEI410.1:1 at 5600 rpm at 4000 rpm
Z12XEI410.1:1 at 5600 rpm at 4000 rpm

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Generation II

The second generation Family 0 began production in November 2002. It is an updated version of the Family 0 engine and features TwinPort technology – twin intake ports with a choke closing one of the ports at low RPM, providing strong air swirl pattern for higher torque levels and better Fuel [economy in automobiles|fuel economy]. The crankshaft and oil galleries were also redesigned to lower power loss; thereby increasing fuel economy.
NameDisplacementConfigurationBoreStrokeCompression RatioPowerTorque
Z10XEPI310.5:1 at 5600 rpm at 3800 rpm
Z12XEPI410.5:1 at 5600 rpm at 4000 rpm
Z14XEPI410.5:1 at 5600 rpm at 4000 rpm

Applications:

Generation III

The EcoFlex engine is a version of the TwinPort tuned to provide better fuel economy and lower emissions. The 1.4 L engine was introduced in 2008 and the 1.0 L engine in 2010. For model year 2012, the EcoFlex engines have been updated with dual continuous variable cam phasing (DCVCP) in a Gen III block.
Certain Opel and US-market Chevrolet versions of the Delta II platform compact cars use a turbocharged version of the 1.4 L engine with dual continuous variable cam phasing (DCVCP); in the future, an optional gasoline direct injection system will be introduced.
Opel versions feature Start&Stop system from 2011 and a Gen III block; a lower-power 120 ps version has been introduced as well. For model year 2013, the overboost to has been added.
NameDisplacementConfigurationBoreStrokeCompression RatioPowerTorque
A10XEP I310.5:1 at 5300 rpm at 4000 rpm
A12XEL I410.5:1 at 5600 rpm at 4000 rpm
A12XER I410.5:1 at 5600 rpm at 4000 rpm
A14XFL I410.5:1 at 4800 rpm at 4800 rpm
A14XEL I410.5:1 at 6000 rpm at 4000 rpm
A14XER I410.5:1 at 6000 rpm at 4000 rpm
A14XFR I410.5:1 at 6000 rpm at 4000 rpm
A14NEL/B14NEL I49.5:1 at 4800–6000 rpm
A14NET I49.5:1 at 4900–6000 rpm
U14NFT I49.5:1 at 4900–6000 rpm
U14NFT I49.5:1 at 4900 rpm at 1850 or 2500 rpm
B14NEH I49.5:1 at 4900-5500 rpm at 2750-4500 rpm

Applications: