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Acura F22C1 specs: 2.2L (132 ci) 4-cylinder, 87 x 90.7 mm (3.4252 x 3.5709 in) bore and stroke, 11.1:1 compression. Rated 237 hp. Rod ratio and piston speed.
The Acura F22C1 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 33.0 ci (541 cc).
11.1:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 2 engines in the Honda F-series family, the largest at 132 ci. Factory fitments include the Honda S2000 (US 2004-2009), Honda S2000 (Japan 2006-2009).
| Displacement | 132 ci / 2.2 L |
|---|---|
| Bore | 3.4252" |
| Stroke | 3.5709" |
| Cylinders | 4 |
| Compression ratio | 11.1:1 |
| Bore/stroke ratio | 0.959 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 237 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 | 33.0 ci |
| Static compression | 11.1:1 — high enough that pump premium or better is normally required |
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