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Toyota 1C specs: 1.8L (112 ci) 4-cylinder, 83 x 85 mm (3.2677 x 3.3465 in) bore and stroke, 22.5:1 compression. Built 1984–1985. Used in the Toyota Corolla.
The Toyota 112ci (1C) is close to square: 3.2677" bore against 3.3465" stroke, within 2.4%, 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 4 cylinders displaces 28.0 ci (459 cc).
At 22.5:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
It is one of 2 engines in the Toyota 112ci family, all of them 112 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions across 1984–1985.
| Displacement | 112 ci / 1.8 L |
|---|---|
| Bore | 3.2677" |
| Stroke | 3.3465" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 22.5:1 * |
| Bore/stroke ratio | 0.976 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | diesel |
|---|---|
| Years | 1984–1985 |
| Bore/stroke character | 0.976 — 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 | 28.0 ci |
| Static compression | 22.5:1 — 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 |
|---|---|---|
| 1984 | — | 1C |
| 1985 | — | 1C |
1 factory vehicle, 1984–1985. Each year opens that model's engine table.