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Hyundai G4GM specs: 1.8L (109.8 ci) 4-cylinder, 82 x 85 mm (3.2283 x 3.3465 in) bore and stroke, 10:1 compression. Rated 130 hp. Rod ratio and piston speed.
The Hyundai G4GM is close to square: 3.2283" bore against 3.3465" stroke, within 3.5%, which splits the difference between a high-revving layout and a torque layout. The 3.3465" stroke does not reach 4,000 ft/min of mean piston speed until about 7,150 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 27.5 ci (450 cc).
10:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 3 engines in the Beta family, the smallest at 109.8 ci. Factory fitments include the Hyundai Elantra, Hyundai Tiburon.
| Displacement | 109.8 ci / 1.8 L |
|---|---|
| Bore | 3.2283" |
| Stroke | 3.3465" |
| Cylinders | 4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.965 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 130 hp |
| Bore/stroke character | 0.965 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,347 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.4 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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