See other engines in this family
Acura C27A specs: 2.7L (164.7 ci) 6-cylinder, 87 x 75 mm (3.4252 x 2.9528 in) bore and stroke, 9:1 compression. Rated 160 hp. Rod ratio and piston speed.
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 27.5 ci (450 cc).
9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 4 engines in the Honda C-series family, the smallest at 164.7 ci. Factory fitments include the Acura Legend, Honda Legend, Honda Inspire and 1 other.
| Displacement | 164.7 ci / 2.7 L |
|---|---|
| Bore | 3.4252" |
| Stroke | 2.9528" |
| Cylinders | 6 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.16 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 160 hp |
| 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 | 27.4 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.