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Nissan E-1 specs: 1.2L (73 ci) 4-cylinder, 73 x 71 mm (2.8740 x 2.7953 in) bore and stroke. Rated 60 hp, 1962–1965. Used in the Nissan Datsun / Nissan Pickup.
The Nissan 73ci (E-1) is close to square: 2.874" bore against 2.7953" stroke, within 2.8%, which splits the difference between a high-revving layout and a torque layout. The 2.7953" stroke does not reach 4,000 ft/min of mean piston speed until about 8,600 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 18.3 ci (299 cc).
It is one of 2 engines in the Nissan 73ci family, all of them 73 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions, rated at 60 hp across 1962–1965.
| Displacement | 73 ci / 1.2 L |
|---|---|
| Bore | 2.874" |
| Stroke | 2.7953" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 1.028 |
| Fuel type | gas |
|---|---|
| Advertised HP | 60 hp |
| Years | 1962–1965 |
| Bore/stroke character | 1.028 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 2,795 ft/min — conservative for a street engine |
| Displacement per cylinder | 18.3 ci |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1962 | 60 hp | E-1 |
| 1963 | 60 hp | E-1 |
| 1964 | 60 hp | E-1 |
| 1965 | 60 hp | E-1 |
1 factory vehicle, 1962–1965. Each year opens that model's engine table.