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Honda F23A5 specs: 2.3L (137.5 ci) 4-cylinder, 86 x 97 mm (3.3858 x 3.8189 in) bore and stroke, 8.8:1 compression. Rated 135 hp, 1998–2002.
The Honda F23A5 is undersquare — the 3.8189" stroke exceeds the 3.3858" bore by 11.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.8189" stroke puts mean piston speed at 4,000 ft/min around 6,300 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 34.4 ci (563 cc).
8.8:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 10 engines in the F-series family, the largest at 137.5 ci. 5 factory variants share these dimensions, rated at 135 hp across 1998–2002.
| Displacement | 137.5 ci / 2.3 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 3.8189" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.8:1 |
| Bore/stroke ratio | 0.887 |
| Valvetrain | SOHC |
|---|---|
| Fuel type | gas |
| Advertised HP | 135 hp |
| Years | 1998–2002 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1998 | F23A5 net | 135 @ 5400 | 145 lb-ft @ 4700 | 8.8:1 |
| 1999 | F23A5 net | 135 @ 5400 | 145 lb-ft @ 4700 | 8.8:1 |
| 2000 | F23A5 net | 135 @ 5400 | 145 lb-ft @ 4700 | 8.8:1 |
| 2001 | F23A5 net | 135 @ 5400 | 145 lb-ft @ 4700 | 8.8:1 |
| 2002 | F23A5 net | 135 @ 5400 | 145 lb-ft @ 4700 | 8.8:1 |
Factory specification sheet.
| Bore/stroke character | 0.887 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,819 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 34.4 ci |
| Static compression | 8.8:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 1998 | 135 hp | F23A5 |
| 1999 | 135 hp | F23A5 |
| 2000 | 135 hp | F23A5 |
| 2001 | 135 hp | F23A5 |
| 2002 | 135 hp | F23A5 |
1 factory vehicle, 1998–2002. Each year opens that model's engine table.