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Acura J32A3 specs: 3.2L (196 ci) 6-cylinder, 89 x 86 mm (3.5039 x 3.3858 in) bore and stroke, 11:1 compression. Rated 270 hp. Rod ratio and piston speed.
The Acura J32A3 is close to square: 3.5039" bore against 3.3858" stroke, within 3.5%, which splits the difference between a high-revving layout and a torque layout. The 3.3858" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 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 (535 cc).
11:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 10 engines in the Honda J-series family, sitting between the 182.9 ci and 225.7 ci members. Factory fitments include the Acura TL.
| Displacement | 196 ci / 3.2 L |
|---|---|
| Bore | 3.5039" |
| Stroke | 3.3858" |
| Cylinders | 6 |
| Compression ratio | 11:1 |
| Bore/stroke ratio | 1.035 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 270 hp |
| Bore/stroke character | 1.035 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,386 ft/min — conservative for a street engine |
| Displacement per cylinder | 32.7 ci |
| Static compression | 11:1 — high enough that pump premium or better is normally required |
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