See other engines in this family
Mazda BP DOHC specs: 1.8L (110 ci) 4-cylinder, 83 x 85 mm (3.2677 x 3.3465 in) bore and stroke, 9:1 compression. Built 1995–1998. Used in the Mazda Protege.
The Mazda BP DOHC is close to square: 3.2677" bore against 3.3465" stroke, within 2.4%, which splits the difference between a high-revving layout and a torque layout. The 3.3465" stroke does not reach 4,000 ft/min of mean piston speed until about 7,150 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 27.5 ci (451 cc).
9:1 is low by modern standards and generally happy on regular pump fuel.
4 factory variants share these dimensions across 1995–1998.
| Displacement | 110 ci / 1.8 L |
|---|---|
| Bore | 3.2677" |
| Stroke | 3.3465" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 0.976 |
| Fuel type | gas |
|---|---|
| Years | 1995–1998 |
| Bore/stroke character | 0.976 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,347 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.5 ci |
| Static compression | 9:1 — 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 |
|---|---|---|
| 1995 | — | BP DOHC |
| 1996 | — | BP DOHC |
| 1997 | — | BP DOHC |
| 1998 | — | BP DOHC |
1 factory vehicle, 1995–1998. Each year opens that model's engine table.