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Honda F23A7 specs: 2.3L (137 ci) 4-cylinder, 86 x 97 mm (3.3858 x 3.8189 in) bore and stroke, 9.3:1 compression. Rated 150 hp, 1998.
The Honda F23A7 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 34.3 ci (561 cc).
9.3:1 is low by modern standards and generally happy on regular pump fuel.
| Displacement | 137 ci / 2.3 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 3.8189" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.3:1 |
| Bore/stroke ratio | 0.887 |
| Fuel type | gas |
|---|---|
| Advertised HP | 150 hp |
| Years | 1998 |
| 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 | 34.3 ci |
| Static compression | 9.3:1 — low by modern standards, generally happy on regular pump fuel |
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1 factory vehicle, 1998. Each year opens that model's engine table.