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Honda J32A1 specs: 3.2L (196.2 ci) 6-cylinder, 89 x 85 mm (3.5039 x 3.3465 in) bore and stroke, 9.8:1 compression. Rated 225 hp. Rod ratio and piston speed.
The Honda J32A1 is close to square: 3.5039" bore against 3.3465" stroke, within 4.7%, which splits the difference between a high-revving layout and a torque layout. The 3.3465" stroke does not reach 4,000 ft/min of mean piston speed until about 7,150 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 32.7 ci (536 cc).
9.8:1 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 13 engines in the J-series V6 family, sitting between the 152.6 ci and 224.6 ci members. Factory fitments include the Acura TL, Acura CL.
| Displacement | 196.2 ci / 3.2 L |
|---|---|
| Bore | 3.5039" |
| Stroke | 3.3465" |
| Cylinders | 6 |
| Compression ratio | 9.8:1 |
| Bore/stroke ratio | 1.047 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 225 hp |
| Bore/stroke character | 1.047 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,347 ft/min — conservative for a street engine |
| Displacement per cylinder | 32.7 ci |
| Static compression | 9.8:1 — in the range that usually runs on pump premium |
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