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Acura Honda B-series specs: 1.8L (110 ci) 4-cylinder, 81 x 89 mm (3.1890 x 3.5039 in) bore and stroke, 9.2:1 compression. Rated 130-140 hp. DOHC.
The Acura Honda B-series is undersquare — the 3.5039" stroke exceeds the 3.189" bore by 9.0% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5039" stroke puts mean piston speed at 4,000 ft/min around 6,850 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 27.5 ci (451 cc).
9.2:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 12 engines in the Honda B-series family, sitting between the 97 ci and 121.8 ci members. 2 factory variants share these dimensions, rated from 130 to 140 hp. Factory fitments include the Acura Integra LS/GS/RS (DA9/DB1), Acura Integra LS/GS/RS (DC4/DB7).
| Displacement | 110 ci / 1.8 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.5039" |
| Cylinders | 4 |
| Compression ratio | 9.2:1 |
| Bore/stroke ratio | 0.91 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 130–140 hp |
| Bore/stroke character | 0.910 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,504 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 27.5 ci |
| Static compression | 9.2:1 — low by modern standards, generally happy on regular pump fuel |
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These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 130 hp | B18A1 |
| — | 140 hp | B18B1 |