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Mitsubishi 4N14 specs: 2.3L (138 ci) 4-cylinder, 86 x 97.6 mm (3.3858 x 3.8425 in) bore and stroke, 14.9:1 compression. Rated 175 hp. DOHC.
The Mitsubishi 4N14 is undersquare — the 3.8425" stroke exceeds the 3.3858" bore by 11.9% — a layout that trades peak RPM for leverage and torque low in the range. The 3.8425" stroke puts mean piston speed at 4,000 ft/min around 6,250 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 34.5 ci (565 cc).
At 14.9:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
It is one of 2 engines in the 4N1 family, the smallest at 138 ci. Factory fitments include the Outlander, Delica D:5, ASX.
| Displacement | 138 ci / 2.3 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 3.8425" |
| Cylinders | 4 |
| Compression ratio | 14.9:1 |
| Bore/stroke ratio | 0.881 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | diesel |
| Advertised HP | 175 hp |
| Bore/stroke character | 0.881 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,843 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 34.5 ci |
| Static compression | 14.9:1 — high enough that pump premium or better is normally required |
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