See other engines in this family
The same engine also has a main page: Honda C27A.
Acura C27A specs: 2.7L (163.2 ci) 6-cylinder, 87 x 75 mm (3.4252 x 2.9528 in) bore and stroke, 9:1 compression. Rated 161 hp, 1987–1990.
The Acura C27A is oversquare — the 3.4252" bore exceeds the 2.9528" stroke by 16.0% — a layout that favors airflow and RPM over leverage at the crank. The 2.9528" stroke does not reach 4,000 ft/min of mean piston speed until about 8,150 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 27.2 ci (446 cc).
9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 7 engines in the Honda C-series family, the smallest at 163.2 ci. 4 factory variants share these dimensions, rated at 161 hp across 1987–1990.
| Displacement | 163.2 ci / 2.7 L |
|---|---|
| Bore | 3.4252" |
| Stroke | 2.9528" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.16 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 161 hp |
| Years | 1987–1990 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1987 | C27A net | 161 @ 5900 | 162 lb-ft @ 4500 | 9:1 |
| 1988 | C27A net | 161 @ 5900 | 162 lb-ft @ 4500 | 9:1 |
Factory specification sheet.
| Bore/stroke character | 1.160 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,953 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.2 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 |
|---|---|---|
| 1987 | 161 hp | C27A |
| 1988 | 161 hp | C27A |
| 1989 | — | C27A |
| 1990 | — | C27A |
2 factory vehicles, 1987–1997. Each year opens that model's engine table.