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Isuzu 4XF1 specs: 1.8L (110 ci) 4-cylinder, 80 x 90 mm (3.1496 x 3.5433 in) bore and stroke. Rated 140 hp, 1992. Used in the Isuzu Impulse.
The Isuzu 4XF1 is undersquare — the 3.5433" stroke exceeds the 3.1496" bore by 11.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5433" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 27.5 ci (451 cc).
It is one of 2 engines in the Isuzu 110ci family, all of them 110 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 110 ci / 1.8 L |
|---|---|
| Bore | 3.1496" |
| Stroke | 3.5433" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.889 |
| Fuel type | gas |
|---|---|
| Advertised HP | 140 hp |
| Years | 1992 |
| Bore/stroke character | 0.889 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,543 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 27.5 ci |
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1 factory vehicle, 1992. Each year opens that model's engine table.