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Toyota 20R specs: 2.2L (133.6 ci) 4-cylinder, 88.5 x 89 mm (3.4843 x 3.5039 in) bore and stroke. SOHC. Rod ratio and piston speed worked out.
The Toyota R (20R) is close to square: 3.4843" bore against 3.5039" stroke, within 0.6%, which splits the difference between a high-revving layout and a torque layout. The 3.5039" stroke puts mean piston speed at 4,000 ft/min around 6,850 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 33.4 ci (547 cc).
It is one of 4 engines in the R family, the largest at 133.6 ci.
| Displacement | 133.6 ci / 2.2 L |
|---|---|
| Bore | 3.4843" |
| Stroke | 3.5039" |
| Cylinders | 4 |
| Bore/stroke ratio | 0.994 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Bore/stroke character | 0.994 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,504 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 33.4 ci |
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