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Isuzu 4ZE1 specs: 2.6L (159 ci) 4-cylinder, 92.6 x 95 mm (3.6457 x 3.7402 in) bore and stroke, 8.3:1 compression. Rated 120 hp, 1988–1997.
The Isuzu 4ZE1 is close to square: 3.6457" bore against 3.7402" stroke, within 2.5%, which splits the difference between a high-revving layout and a torque layout. The 3.7402" stroke puts mean piston speed at 4,000 ft/min around 6,400 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 39.8 ci (651 cc).
8.3:1 is low by modern standards and generally happy on regular pump fuel.
11 factory variants share these dimensions, rated at 120 hp across 1988–1997.
| Displacement | 159 ci / 2.6 L |
|---|---|
| Bore | 3.6457" |
| Stroke | 3.7402" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.3:1 * |
| Bore/stroke ratio | 0.975 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 120 hp |
| Years | 1988–1997 |
| Bore/stroke character | 0.975 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,740 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 39.8 ci |
| Static compression | 8.3:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1988 | — | 4ZE1 |
| 1989 | — | 4ZE1 |
| 1990 | — | 4ZE1 |
| 1991 | — | 4ZE1 |
| 1992 | — | 4ZE1 |
| 1993 | — | 4ZE1 |
| 1994 | — | 4ZE1 |
| 1994 | 120 hp | 4ZE1 |
| 1995 | — | 4ZE1 |
| 1996 | — | 4ZE1 |
| 1997 | — | 4ZE1 |
4 factory vehicles, 1988–1997. Each year opens that model's engine table.