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Nissan KA24E specs: 2.4L (146 ci) 4-cylinder, 89 x 96 mm (3.5040 x 3.7800 in) bore and stroke. Rated 140 hp, 1989–1990. Used in the Nissan 240SX. SOHC.
The Nissan KA24E is undersquare — the 3.78" stroke exceeds the 3.504" bore by 7.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.78" stroke puts mean piston speed at 4,000 ft/min around 6,350 RPM, which is where a production bottom end is generally considered at its limit. A rod ratio of 1.719 is in the range most production engines fall in. Each of the 4 cylinders displaces 36.5 ci (598 cc).
It is one of 3 engines in the Nissan 146ci family, all of them 146 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions, rated at 140 hp across 1989–1990.
| Displacement | 146 ci / 2.4 L |
|---|---|
| Bore | 3.504" |
| Stroke | 3.78" |
| Cylinders | 4 |
| Configuration | I4 |
| Rod length | 6.498" |
| Rod ratio | 1.719 |
| Bore/stroke ratio | 0.927 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 140 hp |
| Years | 1989–1990 |
| Bore/stroke character | 0.927 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,780 ft/min — in the range typical of performance street engines |
| Rod ratio | 1.719 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 36.5 ci |
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These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1989 | 140 hp | KA24E |
| 1990 | 140 hp | KA24E |