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Honda 122ci specs: 2.0L (122 ci) 4-cylinder, 86 x 86 mm (3.3860 x 3.3860 in) bore and stroke, 11:1 compression. Rated 197 hp, 2006–2007. SOHC.
The Honda 122ci is exactly square — 3.386" bore and 3.386" stroke are the same — which splits the difference between a high-revving layout and a torque layout. The 3.386" 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. A rod ratio of 1.696 is in the range most production engines fall in. Each of the 4 cylinders displaces 30.5 ci (500 cc).
11:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 2 engines in the Honda 122ci family, all of them 122 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions, rated at 197 hp across 2006–2007.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.386" |
| Stroke | 3.386" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 11:1 |
| Rod length | 5.742" |
| Rod ratio | 1.696 |
| Bore/stroke ratio | 1 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 197 hp |
| Years | 2006–2007 |
| Bore/stroke character | 1.000 — 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 |
| Rod ratio | 1.696 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 30.5 ci |
| Static compression | 11:1 — high enough that pump premium or better is normally required |
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 |
|---|---|---|
| 2006 | 197 hp | — |
| 2007 | 197 hp | — |