See other engines in this family
Acura C30A specs: 3.0L (182 ci) 6-cylinder, 90 x 78 mm (3.5433 x 3.0709 in) bore and stroke, 10.2:1 compression. Rated 252-270 hp, 1991–2005.
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 30.3 ci (497 cc).
10.2:1 is in the range that usually runs on pump premium.
21 factory variants share these dimensions, rated from 252 to 270 hp across 1991–2005.
| Displacement | 182 ci / 3 L |
|---|---|
| Bore | 3.5433" |
| Stroke | 3.0709" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 10.2:1 |
| Bore/stroke ratio | 1.154 |
| Fuel type | gas |
|---|---|
| Advertised HP | 252–270 hp |
| Years | 1991–2005 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1991 | C30A net | 252 @ 6600 | 210 lb-ft @ 5300 | 10.2:1 |
| 1991 | C30A net | 270 @ 7100 | 210 lb-ft @ 5300 | 10.2:1 |
| 1992 | C30A net | 252 @ 6600 | 210 lb-ft @ 5300 | 10.2:1 |
| 1992 | C30A net | 270 @ 7100 | 210 lb-ft @ 5300 | 10.2:1 |
| 1993 | C30A net | 252 @ 6600 | 210 lb-ft @ 5300 | 10.2:1 |
| 1993 | C30A net | 270 @ 7100 | 210 lb-ft @ 5300 | 10.2:1 |
| 1994 | C30A net | 252 @ 6600 | 210 lb-ft @ 5300 | 10.2:1 |
| 1994 | C30A net | 270 @ 7100 | 210 lb-ft @ 5300 | 10.2:1 |
| 1995 | C30A net | 252 @ 6600 | 210 lb-ft @ 5300 | 10.2:1 |
| 1995 | C30A net | 270 @ 7100 | 210 lb-ft @ 5300 | 10.2:1 |
| 1996 | C30A net | 252 @ 6600 | 210 lb-ft @ 5300 | 10.2:1 |
| 1997 | C30A net | 252 @ 6600 | 210 lb-ft @ 5300 | 10.2:1 |
| 1999 | C30A net | 252 @ 6600 | 210 lb-ft @ 5300 | 10.2:1 |
| 2000 | C30A net | 252 @ 6600 | 210 lb-ft @ 5300 | 10.2:1 |
| 2002 | C30A net | 252 @ 6600 | 210 lb-ft @ 5300 | 10.2:1 |
| 2003 | C30A net | 252 @ 6600 | 210 lb-ft @ 5300 | 10.2:1 |
| 2005 | C30A net | 252 @ 6600 | 210 lb-ft @ 5300 | 10.2:1 |
Factory specification sheet.
| 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 | 30.3 ci |
| Static compression | 10.2:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| 1991 | 252 hp | C30A |
| 1991 | 270 hp | C30A |
| 1992 | 252 hp | C30A |
| 1992 | 270 hp | C30A |
| 1993 | 252 hp | C30A |
| 1993 | 270 hp | C30A |
| 1994 | 252 hp | C30A |
| 1994 | 270 hp | C30A |
| 1995 | 252 hp | C30A |
| 1995 | 270 hp | C30A |
| 1996 | — | C30A |
| 1996 | 252 hp | C30A |
| 1997 | 252 hp | C30A |
| 1998 | — | C30A |
| 1999 | 252 hp | C30A |
| 2000 | 252 hp | C30A |
| 2001 | — | C30A |
| 2002 | 252 hp | C30A |
| 2003 | 252 hp | C30A |
| 2004 | — | C30A |
| 2005 | 252 hp | C30A |
1 factory vehicle, 1991–2005. Each year opens that model's engine table.