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, 814 cc version with a 67x77 mm bore and stroke. Output is 56 PS at 5,500 rpm and 7.6 kgm 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, 798 cc version with a 63x64 mm bore and stroke. Output is 54 PS at 6,000 rpm and 7.4 kgm at 4,000 rpm.

0.8 L LPG (L4HA)

The L4HA is a 4-cylinder, 798 cc LPG version with a 63x64 mm bore and stroke. Output is 48 PS at 6,000 rpm and 6.6 kgm at 4,000 rpm.

0.8 L TCI (G4HA)

The G4HA is a turbocharged 4-cylinder, 798 cc version with a 63x64 mm bore and stroke. Output is 70 PS at 6,000 rpm and 10.5 kgm at 4,000 rpm.

1.0 L (G4HC/G4HE)

The G4HC/G4HE is a 4-cylinder 3 valves per cylinder engine that displaces 999 cc with a larger 66x73 mm bore and stroke. The G4HC power is 54 - 58 PS at 5,700 rpm and 7.4 - 8.6 kgm at 3,000 rpm. This engine has been used in Hyundai's Hatchback Atos/Santro. The G4HE power is 61 - 72 PS at 5,600–6,000 rpm and 8.8 - 9.2 kgm at 4,500 rpm. This engine has been used in the Kia Picanto.

1.0 L LPG (L4HE)

The L4HE is a 4-cylinder, 999 cc LPG version with a 66x73 mm bore and stroke. Output is 67 - 72 PS at 5,600–6,000 rpm and 9 - 9.2 kgm 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 1086 cc with a larger 67x77 mm 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 and idle RPMs are 750± 100. The G4HD power is 60 - 64 PS at 5,500 rpm and 8.9 - 9.6 kgm at 2,800 rpm. The G4HG power is 64 - 70 PS at 5,500 rpm and 9.9 - 10.1 kgm at 2,800–4,500 rpm. The CNG version of the engine is rated 60 PS at 5,500 rpm and 8.7 kgm at 4,500 rpm.