See other engines in this family
Acura C32B specs: 3.2L (194 ci) 6-cylinder, 93 x 78 mm (3.6614 x 3.0709 in) bore and stroke, 10.2:1 compression. Rated 290 hp, 1997–2005.
The Acura C32B is oversquare — the 3.6614" bore exceeds the 3.0709" stroke by 19.2% — 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 32.3 ci (530 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 7 engines in the Honda C-series family, sitting between the 163.2 ci and 196 ci members. 9 factory variants share these dimensions, rated at 290 hp across 1997–2005.
| Displacement | 194 ci / 3.2 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 3.0709" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 10.2:1 |
| Bore/stroke ratio | 1.192 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Redline | 8,000 rpm (factory limit) |
| Advertised HP | 290 hp |
| Years | 1997–2005 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1997 | C32B net | 290 @ 7100 | 224 lb-ft @ 5500 | 10.2:1 |
| 1998 | C32B net | 290 @ 7100 | 224 lb-ft @ 5500 | 10.2:1 |
| 2001 | C32B net | 290 @ 7100 | 224 lb-ft @ 5500 | 10.2:1 |
| 2004 | C32B net | 290 @ 7100 | 224 lb-ft @ 5500 | 10.2:1 |
| 2005 | C32B net | 290 @ 7100 | 224 lb-ft @ 5500 | 10.2:1 |
Factory specification sheet.
| Bore/stroke character | 1.192 — 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 | 32.3 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 |
|---|---|---|
| 1997 | 290 hp | C32B |
| 1998 | 290 hp | C32B |
| 1999 | — | C32B |
| 2000 | — | C32B |
| 2001 | 290 hp | C32B |
| 2002 | — | C32B |
| 2003 | — | C32B |
| 2004 | 290 hp | C32B |
| 2005 | 290 hp | C32B |
1 factory vehicle, 1997–2005. Each year opens that model's engine table.