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Acura Honda B-series specs: 1.6L (97 ci) 4-cylinder, 81 x 77.4 mm (3.1890 x 3.0472 in) bore and stroke, 10.2:1 compression. Rated 150-160 hp. DOHC.
The Acura Honda B-series is close to square: 3.189" bore against 3.0472" stroke, within 4.7%, which splits the difference between a high-revving layout and a torque layout. The 3.0472" stroke does not reach 4,000 ft/min of mean piston speed until about 7,900 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.3 ci (397 cc).
10.2:1 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.
It is one of 12 engines in the Honda B-series family, the smallest at 97 ci. 2 factory variants share these dimensions, rated from 150 to 160 hp. Factory fitments include the Honda Civic (ED7/EE9) (European), Honda CRX (EE8) (European), Honda Integra XSi/RSi (DA6/DA8) and 6 others.
| Displacement | 97 ci / 1.6 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.0472" |
| Cylinders | 4 |
| Compression ratio | 10.2:1 |
| Bore/stroke ratio | 1.047 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 150–160 hp |
| Bore/stroke character | 1.047 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,047 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.3 ci |
| Static compression | 10.2:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| — | 150 hp | B16A1 |
| — | 160 hp | B16A, B16A2, B16A3 |