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Nissan RB24S specs: 2.4L (146.5 ci) 6-cylinder, 86 x 69.7 mm (3.3858 x 2.7441 in) bore and stroke, 9:1 compression. Rated 139 hp. Rod ratio and piston speed.
The Nissan RB24S is oversquare — the 3.3858" bore exceeds the 2.7441" stroke by 23.4% — a layout that favors airflow and RPM over leverage at the crank. The 2.7441" stroke does not reach 4,000 ft/min of mean piston speed until about 8,750 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 24.4 ci (400 cc).
9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 11 engines in the RB family, sitting between the 121.8 ci and 182.7 ci members. Factory fitments include the Nissan Cefiro A31 (export models).
| Displacement | 146.5 ci / 2.4 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 2.7441" |
| Cylinders | 6 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.234 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 139 hp |
| Bore/stroke character | 1.234 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,744 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.4 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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