Hyundai Epsilon engine
Hyundai's Epsilon engine is a category of small  inline gasoline automobile engines.

0.8 L (G3HA/G3HG)
The G3HA and G3HG engines are a 3-cylinder, 9 valves, SOHC,  version with a  bore and stroke. Output is  at 5,500 rpm and  at 4,000 rpm. This engine has been used in Hyundai's small hatchback Hyundai Eon. As the name suggests this engine is a G4HG engine with one fewer cylinders mainly designed for high fuel efficiency.

0.8 L (G4HA)
The G4HA is a 4-cylinder,  version with a  bore and stroke. Output is  at 6,000 rpm and  at 4,000 rpm.

0.8 L LPG (L4HA)
The L4HA is a 4-cylinder,  LPG version with a  bore and stroke. Output is  at 6,000 rpm and  at 4,000 rpm.

0.8 L TCI (G4HA)
The G4HA is a turbocharged 4-cylinder,  version with a  bore and stroke. Output is  at 6,000 rpm and  at 4,000 rpm.

1.0 L (G4HC/G4HE)
The G4HC/G4HE is a 4-cylinder 3 valves per cylinder engine that displaces  with a larger  bore and stroke.

The G4HC power is  at 5,700 rpm and  at 3,000 rpm. This engine has been used in Hyundai's Hatchback Atos/Santro.

The G4HE power is  at 5,600–6,000 rpm and  at 4,500 rpm. This engine has been used in the Kia Picanto.

1.0 L LPG (L4HE)
The L4HE is a 4-cylinder,  LPG version with a  bore and stroke. Output is  at 5,600–6,000 rpm and  at 3,000–4,500 rpm.

1.1 L (G4HD/G4HG)

The G4HD/G4HG is a 4-cylinder 3 valves per cylinder engine that displaces  with a larger  bore and stroke. This engine has been used in Hyundai's i10 (PA), Atos, Santro Xing cars and Kia Picanto. Firing Order of this engine is  1-3-4-2 & idle RPMs are 750± 100.

The G4HD power is  at 5,500 rpm and  at 2,800 rpm.

The G4HG power is  at 5,500 rpm and  at 2,800–4,500 rpm.

The CNG version of the engine is rated  at 5,500 rpm and  at 4,500 rpm.

See also
 List of Hyundai engines

References 

Epsilon
Straight-three engines
Straight-four engines
Gasoline engines by model