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Acura B16A3 specs: 1.6L (97 ci) 4-cylinder, 81 x 77.4 mm (3.1890 x 3.0472 in) bore and stroke. Rated 160 hp, 1994–1995. Used in the Honda Civic. DOHC.
The Acura B16A3 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).
It is one of 12 engines in the Honda B-series family, the smallest at 97 ci. 2 factory variants share these dimensions, rated at 160 hp across 1994–1995.
| Displacement | 97 ci / 1.6 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.0472" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 1.047 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 160 hp |
| Years | 1994–1995 |
| 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 |
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 |
|---|---|---|
| 1994 | 160 hp | B16A3 |
| 1995 | 160 hp | B16A3 |