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Mazda BP DOHC 16V specs: 1.839L (112.2 ci) 4-cylinder, 83 x 85 mm (3.2677 x 3.3465 in) bore and stroke, 9:1 compression. Rated 125 hp, 1990–1994.
The Mazda BP DOHC 16V 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 28.1 ci (460 cc).
9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 21 engines in the B-Series family, the largest at 112.2 ci. 5 factory variants share these dimensions, rated at 125 hp across 1990–1994.
| Displacement | 112.2 ci / 1.839 L |
|---|---|
| Bore | 3.2677" |
| Stroke | 3.3465" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9:1 * |
| Bore/stroke ratio | 0.976 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 125 hp |
| Years | 1990–1994 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1990 | BP DOHC 16V net | 125 @ 6500 * | 114 lb-ft @ 4500 * | 9:1 * |
Factory specification sheet. * Not yet cross-verified.
| 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 | 28.1 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 |
|---|---|---|
| 1990 | 125 hp | BP DOHC 16V |
| 1991 | 125 hp | BP DOHC 16V |
| 1992 | 125 hp | BP DOHC 16V |
| 1993 | 125 hp | BP DOHC 16V |
| 1994 | 125 hp | BP DOHC 16V |
1 factory vehicle, 1990–1994. Each year opens that model's engine table.