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Honda K24A4 specs: 2.4L (144 ci) 4-cylinder, 87 x 99 mm (3.4252 x 3.8976 in) bore and stroke, 9.7:1 compression. Rated 156-166 hp, 2003–2007.
The Honda K24A4 is undersquare — the 3.8976" stroke exceeds the 3.4252" bore by 12.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.8976" stroke puts mean piston speed at 4,000 ft/min around 6,150 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 36.0 ci (590 cc).
9.7:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 27 engines in the K-series family, the largest at 144 ci. 6 factory variants share these dimensions, rated from 156 to 166 hp across 2003–2007.
| Displacement | 144 ci / 2.4 L |
|---|---|
| Bore | 3.4252" |
| Stroke | 3.8976" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.7:1 |
| Bore/stroke ratio | 0.879 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 156–166 hp |
| Years | 2003–2007 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2003 | K24A4 net | 160 @ 5500 | 161 lb-ft @ 4500 | 9.7:1 |
| 2004 | K24A4 net | 160 @ 5500 | 161 lb-ft @ 4500 | 9.7:1 |
| 2005 | K24A4 net | 160 @ 5500 | 161 lb-ft @ 4500 | 9.7:1 |
| 2006 | K24A4 net | 166 @ 5800 | 160 lb-ft @ 4000 | 9.7:1 |
| 2007 | K24A4 net | 166 @ 5800 | 160 lb-ft @ 4000 | 9.7:1 |
Factory specification sheet.
| Bore/stroke character | 0.879 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,898 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 36.0 ci |
| Static compression | 9.7:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2003 | 160 hp | K24A4 |
| 2004 | 160 hp | K24A4 |
| 2005 | 160 hp | K24A4 |
| 2006 | 156 hp | K24A4 |
| 2006 | 166 hp | K24A4 |
| 2007 | 166 hp | K24A4 |
3 factory vehicles, 2003–2007. Each year opens that model's engine table.