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Acura K24Z3 specs: 2.4L (144 ci) 4-cylinder, 87 x 99 mm (3.4252 x 3.8976 in) bore and stroke, 11:1 compression. Rated 201 hp, 2009–2014.
The Acura K24Z3 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).
11:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 13 engines in the Honda K-series family, the largest at 144 ci. 6 factory variants share these dimensions, rated at 201 hp across 2009–2014.
| Displacement | 144 ci / 2.4 L |
|---|---|
| Bore | 3.4252" |
| Stroke | 3.8976" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 11:1 |
| Bore/stroke ratio | 0.879 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Redline | 7,100 rpm (factory limit) |
| Advertised HP | 201 hp |
| Years | 2009–2014 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2009 | K24Z3 net | 201 @ 7000 | 172 lb-ft @ 4300 | 11:1 |
| 2010 | K24Z3 net | 201 @ 7000 | 172 lb-ft @ 4300 | 11:1 |
| 2011 | K24Z3 net | 201 @ 7000 | 172 lb-ft @ 4300 | 11:1 |
| 2012 | K24Z3 net | 201 @ 7000 | 172 lb-ft @ 4300 | 11:1 |
| 2013 | K24Z3 net | 201 @ 7000 | 172 lb-ft @ 4300 | 11:1 |
| 2014 | K24Z3 net | 201 @ 7000 | 172 lb-ft @ 4300 | 11:1 |
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 | 11:1 — high enough that pump premium or better is normally required |
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 |
|---|---|---|
| 2009 | 201 hp | K24Z3 |
| 2010 | 201 hp | K24Z3 |
| 2011 | 201 hp | K24Z3 |
| 2012 | 201 hp | K24Z3 |
| 2013 | 201 hp | K24Z3 |
| 2014 | 201 hp | K24Z3 |
2 factory vehicles, 2008–2014. Each year opens that model's engine table.