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Acura P10A specs: 1.0L (61 ci) 3-cylinder, 73 x 79 mm (2.8740 x 3.1102 in) bore and stroke, 10:1 compression. Rated 127 hp. DOHC. Rod ratio and piston speed.
The Acura P10A is undersquare — the 3.1102" stroke exceeds the 2.874" bore by 7.6% — a layout that trades peak RPM for leverage and torque low in the range. The 3.1102" stroke does not reach 4,000 ft/min of mean piston speed until about 7,700 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 3 cylinders displaces 20.3 ci (333 cc).
10:1 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.
Factory fitments include the Acura CDX.
| Displacement | 61 ci / 1 L |
|---|---|
| Bore | 2.874" |
| Stroke | 3.1102" |
| Cylinders | 3 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.924 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 127 hp |
| Bore/stroke character | 0.924 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,110 ft/min — conservative for a street engine |
| Displacement per cylinder | 20.3 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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