See other engines in this family
Hyundai G4GR specs: 1.5L (91.5 ci) 4-cylinder, 75.5 x 83.5 mm (2.9724 x 3.2874 in) bore and stroke, 9.4:1 compression. Rated 82 hp. SOHC.
The Hyundai G4GR is undersquare — the 3.2874" stroke exceeds the 2.9724" bore by 9.6% — a layout that trades peak RPM for leverage and torque low in the range. The 3.2874" stroke does not reach 4,000 ft/min of mean piston speed until about 7,300 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 22.9 ci (375 cc).
9.4:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 2 engines in the Orion family, the largest at 91.5 ci. Factory fitments include the Hyundai Accent.
| Displacement | 91.5 ci / 1.5 L |
|---|---|
| Bore | 2.9724" |
| Stroke | 3.2874" |
| Cylinders | 4 |
| Compression ratio | 9.4:1 |
| Bore/stroke ratio | 0.904 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 82 hp |
| Bore/stroke character | 0.904 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,287 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.9 ci |
| Static compression | 9.4:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.