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Isuzu 4XE1-T specs: 1.6L (98 ci) 4-cylinder, 80 x 79 mm (3.1496 x 3.1102 in) bore and stroke. Rated 160 hp, 1990–1992. Used in the Isuzu Impulse.
The Isuzu 4XE1-T is close to square: 3.1496" bore against 3.1102" stroke, within 1.3%, which splits the difference between a high-revving layout and a torque layout. The 3.1102" stroke does not reach 4,000 ft/min of mean piston speed until about 7,700 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.5 ci (401 cc).
It is one of 2 engines in the Isuzu 98ci family, all of them 98 ci — the differences between them are in compression, heads and rating, not displacement. 3 factory variants share these dimensions, rated at 160 hp across 1990–1992.
| Displacement | 98 ci / 1.6 L |
|---|---|
| Bore | 3.1496" |
| Stroke | 3.1102" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 1.013 |
| Fuel type | gas |
|---|---|
| Advertised HP | 160 hp |
| Years | 1990–1992 |
| Bore/stroke character | 1.013 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,110 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.5 ci |
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 |
|---|---|---|
| 1990 | — | 4XE1-T |
| 1991 | 160 hp | 4XE1-T |
| 1992 | — | 4XE1-T |
1 factory vehicle, 1990–1992. Each year opens that model's engine table.