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Honda K-series specs: 2.4L (144 ci) 4-cylinder, 87 x 99 mm (3.4252 x 3.8976 in) bore and stroke, 10.5:1 compression. Rated 177-201 hp. DOHC.
The Honda K-series 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).
10.5:1 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 15 engines in the K-series family, the largest at 144 ci. 4 factory variants share these dimensions, rated from 177 to 201 hp. Factory fitments include the Acura TSX (CL9), Honda Accord (CL7/CL9 JDM/EDM), Acura TSX (USDM) and 3 others.
| Displacement | 144 ci / 2.4 L |
|---|---|
| Bore | 3.4252" |
| Stroke | 3.8976" |
| Cylinders | 4 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.879 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 177–201 hp |
| 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 | 10.5:1 — 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 |
|---|---|---|
| — | 177 hp | K24Z2 |
| — | 190 hp | K24A |
| — | 200 hp | K24A2 |
| — | 201 hp | K24Z3 |