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Nissan E15 specs: 1.5L (91 ci) 4-cylinder, 76 x 82 mm (2.9921 x 3.2283 in) bore and stroke. Rated 67 hp, 1982. Used in the Nissan Sentra.
The Nissan 91ci (E15) is undersquare — the 3.2283" stroke exceeds the 2.9921" bore by 7.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.2283" stroke does not reach 4,000 ft/min of mean piston speed until about 7,450 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 22.8 ci (373 cc).
| Displacement | 91 ci / 1.5 L |
|---|---|
| Bore | 2.9921" |
| Stroke | 3.2283" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.927 |
| Fuel type | gas |
|---|---|
| Advertised HP | 67 hp |
| Years | 1982 |
| Bore/stroke character | 0.927 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,228 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.8 ci |
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1 factory vehicle, 1982. Each year opens that model's engine table.