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Acura H22A7 specs: 2.157L (132.7 ci) 4-cylinder, 87 x 90.7 mm (3.4252 x 3.5709 in) bore and stroke, 11:1 compression. Rated 212 hp. DOHC.
The Acura H22A7 is close to square: 3.4252" bore against 3.5709" stroke, within 4.1%, which splits the difference between a high-revving layout and a torque layout. The 3.5709" stroke puts mean piston speed at 4,000 ft/min around 6,700 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 33.2 ci (544 cc).
11:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 4 engines in the Honda H-series family, the smallest at 132.7 ci. Factory fitments include the Honda Accord Type R (EDM).
| Displacement | 132.7 ci / 2.157 L |
|---|---|
| Bore | 3.4252" |
| Stroke | 3.5709" |
| Cylinders | 4 |
| Compression ratio | 11:1 |
| Bore/stroke ratio | 0.959 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 212 hp |
| Bore/stroke character | 0.959 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,571 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 33.2 ci |
| Static compression | 11:1 — high enough that pump premium or better is normally required |
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