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Acura C30A specs: 3.0L (183.1 ci) 6-cylinder, 90 x 78 mm (3.5433 x 3.0709 in) bore and stroke, 10.2:1 compression. Rated 270 hp. Rod ratio and piston speed.
The Acura C30A is oversquare — the 3.5433" bore exceeds the 3.0709" stroke by 15.4% — a layout that favors airflow and RPM over leverage at the crank. The 3.0709" stroke does not reach 4,000 ft/min of mean piston speed until about 7,800 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 30.5 ci (500 cc).
10.2:1 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 4 engines in the Honda C-series family, sitting between the 164.7 ci and 196 ci members. Factory fitments include the Acura NSX, Honda NSX.
| Displacement | 183.1 ci / 3 L |
|---|---|
| Bore | 3.5433" |
| Stroke | 3.0709" |
| Cylinders | 6 |
| Compression ratio | 10.2:1 |
| Bore/stroke ratio | 1.154 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 270 hp |
| Bore/stroke character | 1.154 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,071 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 ci |
| Static compression | 10.2:1 — in the range that usually runs on pump premium |
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