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Honda D15B1 specs: 1.5L (91.5 ci) 4-cylinder, 75 x 84.5 mm (2.9528 x 3.3268 in) bore and stroke, 9.2:1 compression. Built 1988–1991. Used in the Honda Civic.
The Honda D15B1 is undersquare — the 3.3268" stroke exceeds the 2.9528" bore by 11.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.3268" stroke does not reach 4,000 ft/min of mean piston speed until about 7,200 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 22.9 ci (375 cc).
9.2:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 29 engines in the D-series family, sitting between the 82 ci and 101.8 ci members. 4 factory variants share these dimensions across 1988–1991.
| Displacement | 91.5 ci / 1.5 L |
|---|---|
| Bore | 2.9528" |
| Stroke | 3.3268" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.2:1 * |
| Bore/stroke ratio | 0.888 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Firing order | 1-3-4-2 |
| Years | 1988–1991 |
| Bore/stroke character | 0.888 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,327 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.9 ci |
| Static compression | 9.2:1 — 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 |
|---|---|---|
| 1988 | — | D15B1 |
| 1989 | — | D15B1 |
| 1990 | — | D15B1 |
| 1991 | — | D15B1 |
1 factory vehicle, 1988–1991. Each year opens that model's engine table.