Hyundai Alpha engine

The Hyundai Alpha series is a multi-valve four cylinder engine family comprising 1.3, 1.4, 1.5, and 1.6L naturally aspirated versions and a 1.5L turbocharged version. Introduced in 1992, this was Hyundai's first engine designed entirely in-house. Design objectives were to provide high performance and good fuel economy with excellent durability at a reasonable cost.[1]

Hyundai Alpha-series
Overview
ManufacturerHyundai Motors
DesignerDr. Hyun-Soon Lee
Production1992–2011
Layout
Displacement1.3 L (1,341 cc)
1.4 L (1,399 cc)
1.5 L (1,495 cc)
1.6 L (1,599 cc)
Cylinder bore71.5 mm (2.81 in) (1.3L)
75.5 mm (2.97 in) (1.5L)
76.5 mm (3.01 in) (1.6L)
Piston stroke78.1 mm (3.07 inches) (1.4L)
83.5 mm (3.29 inches) (1.3L/1.5L)
87 mm (3.4 inches) (1.6L)
Block materialCast Iron
Head materialAluminum alloy
ValvetrainSingle Overhead Camshaft (SOHC)
Dual Overhead Camshaft (DOHC)
Compression ratio7.5:1–10.0:1
RPM range
Idle800 ± 100 RPM
Combustion
Fuel systemCarbureted
Electronic Fuel Injection
Fuel typePetrol
Gasoline
Oil systemWet sump
Cooling systemLiquid-cooled
Output
Power output72–129 PS (53–95 kW; 71–127 hp)
Torque output11.2–18.3 kg⋅m (81–132 lb⋅ft; 110–179 N⋅m)
Chronology
SuccessorGamma

The first Alpha series engine marketed was the 1.5L, it was a single overhead camshaft (SOHC), twelve (12) valve, inline-four, petrol-based and naturally aspirated version, the engine debuted in the 1992 Hyundai Scoupe.

A dual overhead camshaft (DOHC), four valve per cylinder version was later developed.[2]

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.

Alpha

1.3L (G4EA)
G4EH in a 1999 Hyundai Accent L

The G4EA 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. The 1.3 L engine was not used in North America.

Applications

1.3L EFI (G4EH)

The G4EH is a SOHC 12-valve 1.3 L (1341 cc) engine with electronic fuel injection, bore and stroke are 71.5 mm and 83.5 mm respectively. Output was 83 hp (62 kW) at 5500 rpm and 86 lb·ft (117 N·m) at 3000 rpm. The 1.3 L EFI engine was not used in North America.

1.5L (G4EK)

The G4EK is an in-line four, single overhead camshaft (SOHC), 12 valves (3-valves/cylinder); spark-ignition 4-stroke engine. Power output varies from the market it was sold. Output is 65 kW (87 hp/ 88 PS) with 132 Nm (97 lb-ft) of torque for the European market, 68.5 kW / 92 hp / 93 PS and 132 Nm (97 lb-ft) of torque for the North American market and 75 kW (101 hp/ 102 PS and 142 Nm (105 lb-ft) of torque for the South Korean market.

Applications

1.5L Turbo (G4EK Turbo)

The engine makes 115–129 PS (85–95 kW; 113–127 hp) at 5,500 rpm and 17–18.3 kg⋅m (167–179 N⋅m; 123–132 lb⋅ft) of torque at 4,500 rpm depending on market.

Applications

Alpha II

1.4L (G4EE)

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 at the expense of overall power output.

Applications

1.5L (G4EC/G4FK)

The Hyundai Alpha-II G4EC/G4FK is an upgraded version of the 1.5i Alpha 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 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 variant with an advertised power further increased to 79 kW/ 106 hp / 107 PS (JIS net) and 137 Nm / 101 lb-ft of torque.

Applications

1.6L (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)(for middle east: 110 hp / 112PS) and 143 Nm / 105 lb-ft of torque.

Specification:
Bore: 76.50mm (3.0118 in)
Stroke: 87.00mm (3.4252 in)
Total displacement: 1599 cc (97.54 cu in)
Compression Ratio: 10.0:1
Firing Order: 1-3-4-2
Idle RPM: 750± 100
Ignition Timing at idle speed: BTDC 9° ± 5°/800 rpm

Applications

See also

References
  1. http://papers.sae.org/891185/
  2. https://articles.latimes.com/1992-07-19/business/fi-4835_1_pikes-peak
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