| Hyundai Alpha α-series | |
|---|---|
| Overview | |
| Manufacturer | Hyundai Motors |
| Production | 1992–2011 |
| Layout | |
| Displacement | 1.3 L (1,341 cc) 1.4 L (1,399 cc) 1.5 L (1,495 cc) 1.6 L (1,599 cc) |
| Cylinder bore | 71.5 mm (1.3L) 75.5 mm (1.4/1.5L) 76.5mm (1.6L) |
| Piston stroke | 78.1 mm (1.4L) 83.5 mm (1.3/1.5L) 87 mm (1.6L) |
| Cylinder block material | Cast Iron |
| Cylinder head material | Aluminum alloy |
| Valvetrain | SOHC DOHC |
| Compression ratio | 7.5:1–10.0:1 |
| RPM range | |
| Idle speed | 700-800 ± 100 RPM |
| Combustion | |
| Fuel system | Carbureted Electronic Fuel Injection |
| Fuel type | Gasoline |
| Oil system | Wet sump |
| Cooling system | Liquid-cooled |
| Output | |
| Power output | 72–129 PS (53–95 kW; 71–127 hp) |
| Torque output | 11.2–18.3 kg⋅m (81–132 lb⋅ft; 110–179 N⋅m) |
| Chronology | |
| Successor | Gamma |
The Hyundai Alpha series is a multi-valve gasoline inline four-cylinder engine family comprising 1.3, 1.4, 1.5, and 1.6 L naturally aspirated versions and a 1.5 L turbocharged version. Introduced in 1992, this was Hyundai's first engine designed entirely in-house and was the first indigenous South Korean engine design. Design objectives were to provide high performance and good fuel economy with excellent durability at a reasonable cost.[1]
The first Alpha series engine marketed was the 1.5L SOHC 12-valve inline-four. It was offered in naturally aspirated and turbo versions and debuted in the 1992 Hyundai Scoupe. A 1.3L version debuted later in the Hyundai Accent.
A dual overhead camshaft (DOHC), four valve per cylinder version debuted in the 1996 Hyundai Accent GT.
A strengthened block, an eight-counterweight crankshaft, and hydraulic engine mounts were added from 2000-onward to reduce NVH (noise, vibration and harshness).
The 1.6L Alpha II debuted in 2001, eventually replacing the 1.3L and 1.5L. It was further revised in 2005 with a 1.4L version also debuting. Notable improvements over the Alpha included a DOHC 16-valve cylinder head, graphite-coated piston skirts, 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 1.6L version becoming ULEV-certified in all 50 U.S. states.