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Nissan PR25DD specs: 2.5L (153 ci) 4-cylinder, 88.9 x 100.1 mm (3.5000 x 3.9400 in) bore and stroke, 12:1 compression. Rated 181 hp, 2021.
The Nissan PR25DD is undersquare — the 3.94" stroke exceeds the 3.5" bore by 11.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.94" stroke puts mean piston speed at 4,000 ft/min around 6,100 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 38.3 ci (627 cc).
12:1 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 3 engines in the Nissan 153ci family, all of them 153 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 153 ci / 2.5 L |
|---|---|
| Bore | 3.5" |
| Stroke | 3.94" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 12:1 |
| Bore/stroke ratio | 0.888 |
| Fuel type | gas |
|---|---|
| Redline | 6,200 rpm (factory limit) |
| Advertised HP | 181 hp |
| Years | 2021 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2021 | PR25DD net | 181 @ 6000 | 181 lb-ft @ 3600 | 12:1 |
Factory specification sheet.
| Bore/stroke character | 0.888 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,940 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 38.3 ci |
| Static compression | 12:1 — high enough that pump premium or better is normally required |
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2 factory vehicles, 2019–2026. Each year opens that model's engine table.