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Hyundai G4CN specs: 1.8L (109.8 ci) 4-cylinder, 81.5 x 88 mm (3.2087 x 3.4646 in) bore and stroke, 9.2:1 compression. Rated 105 hp. DOHC.
The Hyundai G4CN is undersquare — the 3.4646" stroke exceeds the 3.2087" bore by 7.4% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4646" stroke puts mean piston speed at 4,000 ft/min around 6,950 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 27.5 ci (450 cc).
9.2:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 3 engines in the Sirius family, the smallest at 109.8 ci. Factory fitments include the Hyundai Elantra, Hyundai Sonata.
| Displacement | 109.8 ci / 1.8 L |
|---|---|
| Bore | 3.2087" |
| Stroke | 3.4646" |
| Cylinders | 4 |
| Compression ratio | 9.2:1 |
| Bore/stroke ratio | 0.926 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 105 hp |
| Bore/stroke character | 0.926 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,465 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.4 ci |
| Static compression | 9.2:1 — low by modern standards, generally happy on regular pump fuel |
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