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Toyota 18R-C specs: 2.0L (120.1 ci) 4-cylinder, 88.5 x 80 mm (3.4843 x 3.1496 in) bore and stroke. SOHC. Rod ratio and piston speed worked out.
The Toyota 18R-C is oversquare — the 3.4843" bore exceeds the 3.1496" stroke by 10.6% — a layout that favors airflow and RPM over leverage at the crank. The 3.1496" stroke does not reach 4,000 ft/min of mean piston speed until about 7,600 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 30.0 ci (492 cc).
It is one of 4 engines in the R family, the smallest at 120.1 ci.
| Displacement | 120.1 ci / 2 L |
|---|---|
| Bore | 3.4843" |
| Stroke | 3.1496" |
| Cylinders | 4 |
| Bore/stroke ratio | 1.106 |
| Valvetrain | SOHC |
|---|---|
| Fuel type | gas |
| Bore/stroke character | 1.106 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,150 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.0 ci |
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