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Isuzu 4ZC1-T specs: 2.0L (122 ci) 4-cylinder, 88 x 82 mm (3.4646 x 3.2283 in) bore and stroke, 7.9:1 compression. Rated 140 hp, 1985–1989.
The Isuzu 4ZC1-T is oversquare — the 3.4646" bore exceeds the 3.2283" stroke by 7.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.2283" stroke does not reach 4,000 ft/min of mean piston speed until about 7,450 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 30.5 ci (500 cc).
7.9:1 is low by modern standards and generally happy on regular pump fuel.
5 factory variants share these dimensions, rated at 140 hp across 1985–1989.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 3.2283" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 7.9:1 |
| Bore/stroke ratio | 1.073 |
| Fuel type | gas |
|---|---|
| Advertised HP | 140 hp |
| Years | 1985–1989 |
| Bore/stroke character | 1.073 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,228 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 ci |
| Static compression | 7.9:1 — 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 |
|---|---|---|
| 1985 | 140 hp | 4ZC1-T |
| 1986 | 140 hp | 4ZC1-T |
| 1987 | 140 hp | 4ZC1-T |
| 1988 | 140 hp | 4ZC1-T |
| 1989 | 140 hp | 4ZC1-T |
1 factory vehicle, 1985–1989. Each year opens that model's engine table.