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Honda K24W9 specs: 2.4L (144 ci) 4-cylinder, 87 x 99 mm (3.4252 x 3.8976 in) bore and stroke, 11.1:1 compression. Rated 184-185 hp, 2015–2019.
The Honda K24W9 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).
11.1:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 27 engines in the K-series family, the largest at 144 ci. 5 factory variants share these dimensions, rated from 184 to 185 hp across 2015–2019.
| Displacement | 144 ci / 2.4 L |
|---|---|
| Bore | 3.4252" |
| Stroke | 3.8976" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 11.1:1 |
| Bore/stroke ratio | 0.879 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 184–185 hp |
| Years | 2015–2019 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2015 | K24W net | 185 @ 6400 | 181 lb-ft @ 3900 | 11.1:1 |
| 2016 | K24W net | 185 @ 6400 | 181 lb-ft @ 3900 | 11.1:1 |
| 2017 | K24W9 net | 184 @ 6400 | 180 lb-ft @ 3900 | 11.1:1 |
| 2018 | K24W9 net | 184 @ 6400 | 180 lb-ft @ 3900 | 11.1:1 |
| 2019 | K24W9 net | 184 @ 6400 | 180 lb-ft @ 3900 | 11.1:1 |
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 | 11.1:1 — 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 |
|---|---|---|
| 2015 | 185 hp | K24W9 |
| 2016 | 185 hp | K24W9 |
| 2017 | 184 hp | K24W9 |
| 2018 | 184 hp | K24W9 |
| 2019 | 184 hp | K24W9 |
1 factory vehicle, 2015–2019. Each year opens that model's engine table.