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Nissan 146ci (2026) specs: 2.4L (146 ci) 4-cylinder, 88 x 97 mm (3.4646 x 3.8189 in) bore and stroke, 11.8:1 compression. Rated 248 hp, 2026.
The Nissan 146ci (2026) is undersquare — the 3.8189" stroke exceeds the 3.4646" bore by 9.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.8189" stroke puts mean piston speed at 4,000 ft/min around 6,300 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 36.5 ci (598 cc).
11.8:1 is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 6 engines in the Nissan 146ci family, all of them 146 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 146 ci / 2.4 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 3.8189" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 11.8:1 * |
| Bore/stroke ratio | 0.907 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 248 hp |
| Years | 2026 |
| Bore/stroke character | 0.907 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,819 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 36.5 ci |
| Static compression | 11.8:1 — high enough that pump premium or better is normally required |
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1 factory vehicle, 2026. Each year opens that model's engine table.