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Acura B18C5 specs: 1.8L (110 ci) 4-cylinder, 81 x 87.2 mm (3.1890 x 3.4331 in) bore and stroke, 10.8:1 compression. Rated 195 hp. Rod ratio and piston speed.
The Acura B18C5 is undersquare — the 3.4331" stroke exceeds the 3.189" bore by 7.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4331" stroke puts mean piston speed at 4,000 ft/min around 7,000 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).
10.8:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 12 engines in the Honda B-series family, sitting between the 97 ci and 121.8 ci members. Factory fitments include the Acura Integra Type R (DC2) (USDM).
| Displacement | 110 ci / 1.8 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.4331" |
| Cylinders | 4 |
| Compression ratio | 10.8:1 |
| Bore/stroke ratio | 0.929 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 195 hp |
| Bore/stroke character | 0.929 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,433 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.5 ci |
| Static compression | 10.8:1 — in the range that usually runs on pump premium |
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