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Nissan L26 specs: 2.6L (156.5 ci) 6-cylinder, 83 x 79 mm (3.2677 x 3.1102 in) bore and stroke. SOHC. Rod ratio and piston speed worked out.
The Nissan L-series (L26) is oversquare — the 3.2677" bore exceeds the 3.1102" stroke by 5.1% — a layout that favors airflow and RPM over leverage at the crank. The 3.1102" stroke does not reach 4,000 ft/min of mean piston speed until about 7,700 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 26.1 ci (427 cc).
It is one of 9 engines in the L-series family, sitting between the 146 ci and 168 ci members.
| Displacement | 156.5 ci / 2.6 L |
|---|---|
| Bore | 3.2677" |
| Stroke | 3.1102" |
| Cylinders | 6 |
| Bore/stroke ratio | 1.051 |
| Valvetrain | SOHC |
|---|---|
| Fuel type | gas |
| Bore/stroke character | 1.051 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,110 ft/min — conservative for a street engine |
| Displacement per cylinder | 26.1 ci |
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