Hyundai Alpha engine

The Hyundai α-series^{(alpha-series)} engine is a multi-valve, four cylinder engines comprises 1.3 and 1.5L naturally aspirated units and a 1.5L turbocharged version. Modern features are incorporated in the engines in order to provide higher performance and good fuel economy with excellent durability at reasonable cost.^[1]

The first α-series engine marketed was the α-1.5D (Engine code:G4EK), it was a modern single overhead camshaft (SOHC), twelve (12) valve, inline-four, petrol-based and naturally aspirated version.

An α-series inline-four, dual overhead camshaft (DOHC), four valve per cylinder version later developed from the α-1.5D.^[2]

The α-series engine debuted in the 1992 Hyundai Scoupe ^{Asia Korea and Europe market} and later used in other Hyundai models.^[3]

The α-series engine were initially produced in 1.3 L and 1.5 L, with only the 1.5 L offered in North America. A strengthened block, an eight-counterweight crankshaft, and hydraulic engine mounts were added in 2000 to reduce NVH (noise, vibration, and harshness).

A 1.6 L version was introduced in 2001 and initially sold alongside earlier versions. The 1.3 L and 1.5 L were later dropped. The 1.6 L engine was further revised in 2005 with a 1.4 L version also available for certain markets. Known as the Alpha II it debuted in the Kia Rio JB. Notable features included a DOHC 16-valve cylinder head, graphite-coated pistons, a strengthened cylinder block, ribbed aluminum oil pan, coil-on-plug ignition, an enlarged throttle body (increased from 48 mm to 52 mm), a revised PCM (powertrain control module), simplified and shortened intake ducting, a revised intake manifold, and a returnless fuel system. These improvements further reduced NVH and emissions, with the 1.6 L version becoming ULEV-certified in all 50 U.S. states.

In 2011 the Alpha engine was replaced with the Hyundai Gamma engine.

1.3

G4EH in a 1999 Hyundai Accent L

The G4EA/G4EH is a SOHC 12-valve 1.3 L (1341 cc) engine, with a bore and stroke of 71.5 mm and 83.5 mm, respectively. Output was 71 hp (53 kW) at 5500 rpm and 81 lb·ft (110 N·m) at 3000 rpm for the carbureted G4EA and 83 hp (62 kW) at 5500 rpm and 86 lb·ft (117 N·m) at 3000 rpm for the G4EH with electronic fuel injection. The 1.3 L engine wasn't available in North America.

α-1.5D 12v^G4EK

The α-1.5D 12v (G4EK) is an in-line four, single overhead camshaft (SOHC), 12 valves (3-valves/cylinder); spark-ignition 4-stroke engine. An α-1.5D-equipped vehicle's power output varies from the market it was sold.

The naturally aspirated engine's advertised power and torque per market is listed below:

Europe Market:
65 kW (87 hp/ 88 PS) ^DIN with 132 Nm (97 lb-ft) of torque

North America market:
68.5 kW / 92 hp / 93 PS ^{SAE net} and 132 Nm (97 lb-ft) of torque.

Asia Korea Domestic Market:
75 kW (101 hp/ 102 PS ^{JIS net} and 142 Nm (105 lb-ft) of torque.

The Hyundai α-1.5D 12v (G4EK) was equipped on the following vehicles listed below:

1992-1996 Hyundai S-Coupe phase-II coupe
^{(Asia Korea DM, Europe and North America Market)}

1994-997 Hyundai Accent (X3 series) 1st-gen. phase-I sedan and hatchback
^{(Europe Germany Market)}

1997-1999 Hyundai Accent (X3 series) 1st-gen. phase-II sedan and hatchback
^{(North America Market)}

α-1.5D 12v Turbo^{G4EK Turbo}

α-1.5D 16v^G4FK

Hyundai Alpha-II series G4FK

The Hyundai Alpha-II G4FK is a modified upgraded version of the 1.5i Alpha-I G4EK SOHC engine. The new 1495cc G4FK is now an in-line 4, spark-ignition 4-stroke, dual overhead camshaft (DOHC) with 16 valves. Thus increasing the Alpha-II G4FK DOHC engine's new advertised power to 75 kW / 101 hp / 102 PS (ECE) and 136 Nm / 100 lb-ft of torque from 1995-1997. In 1998, Hyundai Avante GLS sedan and touring models were equipped with a more powerful Alpha-II G4FK DOHC variant with an advertised power further increased to 79 kW/ 106 hp / 107 PS (JIS net) and 137 Nm / 101 lb-ft of torque.

SPECIFICATIONS:

Total Displacement: 1495 cm3 / 91.2 cui

Bore: 75.50 mm (2.97 in)

Stroke: 83.50 mm (3.29 in)

The Alpha-II G4FK engine was equipped on the vehicles listed below:

1995-1998 Hyundai Avante 1st-gen. phase-I Sedan (Asia Korea DM)

1996-1998 Hyundai Avante 1st-gen. phase-I Touring (Asia Korea DM)

1999-2003 Accent (LC series) 2nd-gen. phase-I Hatchback (North American Market)

α-1.6D^G4ED

The Hyundai Alpha-II G4ED is an in-line 4, spark-ignition 4-stroke, dual overhead camshaft (DOHC) with 16 valves. The engine's advertised power is 77 kW / 103 hp / 105PS (ECE) and 143 Nm / 105 lb-ft of torque.

SPECIFICATIONS:

Bore: 76.50mm (3.0118 in)

Stroke: 87.00mm (3.4252 in)

Total displacement: 1599 cc (97.54 cu in)

Compression Ratio: 10

Firing Order: 1-3-4-2

Idle RPM: 750± 100

Ignition Timing at idle speed: BTDC 9° ± 5°/800 rpm

The Alpha-II series G4ED engine was used on the following vehicles listed below:

2000-2003 Elantra 1.6i (XD) 3rd-gen. phase-I sedan and phase-I hatchback

2003-2006 Hyundai Accent (LC series) 2nd-gen. phase-II hatchback (Europe Market)

2003-2006 Hyundai Elantra (XD series) 3rd-gen. phase-II sedan and phase-II hatchback

1.4

The DOHC 1.4 L (1399 cc) G4EE Alpha II debuted in the 2005 European Kia Rio JB, but wasn't available in North America. It utilized the 75.5 mm bore of the original 1.5 L engine, but was destroked to 78.1 mm. Other design improvements of the 1.6 L G4ED carried over to the 1.4 L G4EE, except for CVVT. The engine was noted for its smoother, freer revving nature as compared to the larger 1.6 L due to its squarer bore:stroke dimensions. It also produced slightly improved fuel consumption, but at the expense of overall power output.

See also

• List of Hyundai engines

Wikimedia Commons has media related to Hyundai Alpha engine.

References

• 1992 Hyundai S-Coupé LS specifications - Carfolio.com
• 1992 Hyundai S-Coupé GT specifications - Carfolio.com
• Hyundai 1.6L Alpha Engine
• Hyundai Accent History
• 2006 Hyundai Accent Press Release