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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, 8.4:1 compression. Rated 90-95 hp, 1975–1980.
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).
8.4:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 4 engines in the R family, the largest at 133.6 ci. 11 factory variants share these dimensions, rated from 90 to 95 hp across 1975–1980.
| Displacement | 133.6 ci / 2.2 L |
|---|---|
| Bore | 3.4843" |
| Stroke | 3.5039" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.4:1 * |
| Bore/stroke ratio | 0.994 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 90–95 hp |
| Years | 1975–1980 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1979 | 20R net | 90 @ 4800 * | 122 lb-ft @ 2400 * | — |
Factory specification sheet. * Not yet cross-verified.
| 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 |
| Static compression | 8.4:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 1975 | — | 20R |
| 1975 | 95 hp | 20R |
| 1976 | — | 20R |
| 1976 | 95 hp | 20R |
| 1977 | — | 20R |
| 1977 | 95 hp | 20R |
| 1978 | — | 20R |
| 1979 | — | 20R |
| 1979 | 90 hp | 20R |
| 1980 | — | 20R |
| 1980 | 90 hp | 20R |
3 factory vehicles, 1975–1980. Each year opens that model's engine table.