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Nissan QR25DER specs: 2.5L (153 ci) 4-cylinder, 88.9 x 100.1 mm (3.5000 x 3.9400 in) bore and stroke, 9.1:1 compression. Rated 250 hp, 2016.
The Nissan QR25DER 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).
9.1:1 is low by modern standards and generally happy on regular pump fuel.
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 | 9.1:1 |
| Bore/stroke ratio | 0.888 |
| Fuel type | gas |
|---|---|
| Advertised HP | 250 hp |
| Years | 2016 |
| 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 | 9.1:1 — low by modern standards, generally happy on regular pump fuel |
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2 factory vehicles, 2014–2016. Each year opens that model's engine table.