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Nissan L24 specs: 2.4L (146 ci) 6-cylinder, 83 x 73.7 mm (3.2677 x 2.9016 in) bore and stroke. SOHC. Rod ratio and piston speed worked out.
The Nissan L-series (L24) is oversquare — the 3.2677" bore exceeds the 2.9016" stroke by 12.6% — a layout that favors airflow and RPM over leverage at the crank. The 2.9016" stroke does not reach 4,000 ft/min of mean piston speed until about 8,250 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 24.3 ci (399 cc).
It is one of 9 engines in the L-series family, the smallest at 146 ci.
| Displacement | 146 ci / 2.4 L |
|---|---|
| Bore | 3.2677" |
| Stroke | 2.9016" |
| Cylinders | 6 |
| Bore/stroke ratio | 1.126 |
| Valvetrain | SOHC |
|---|---|
| Fuel type | gas |
| Bore/stroke character | 1.126 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,902 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.3 ci |
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