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Nissan L18 specs: 1.8L (108 ci) 4-cylinder, 85 x 78 mm (3.3465 x 3.0709 in) bore and stroke, 8.5:1 compression. Rated 100 hp, 1974.
The Nissan 108ci (L18) is oversquare — the 3.3465" bore exceeds the 3.0709" stroke by 9.0% — a layout that favors airflow and RPM over leverage at the crank. The 3.0709" stroke does not reach 4,000 ft/min of mean piston speed until about 7,800 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 27.0 ci (442 cc).
8.5:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 2 engines in the Nissan 108ci family, all of them 108 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 108 ci / 1.8 L |
|---|---|
| Bore | 3.3465" |
| Stroke | 3.0709" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.5:1 |
| Bore/stroke ratio | 1.09 |
| Fuel type | gas |
|---|---|
| Advertised HP | 100 hp |
| Years | 1974 |
| Bore/stroke character | 1.090 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,071 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.0 ci |
| Static compression | 8.5:1 — low by modern standards, generally happy on regular pump fuel |
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1 factory vehicle, 1974. Each year opens that model's engine table.