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Toyota M 3.268" bore specs: 2.8L (168.4 ci) 6-cylinder, 83 x 85 mm (3.2677 x 3.3465 in) bore and stroke. SOHC. Rod ratio and piston speed worked out.
The Toyota M 3.268" bore 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 6 cylinders displaces 28.1 ci (460 cc).
It is one of 6 engines in the M family, the smallest at 168.4 ci. 2 factory variants share these dimensions.
| Displacement | 168.4 ci / 2.8 L |
|---|---|
| Bore | 3.2677" |
| Stroke | 3.3465" |
| Cylinders | 6 |
| Bore/stroke ratio | 0.976 |
| Valvetrain | SOHC |
|---|---|
| Fuel type | gas |
| 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 | 28.1 ci |
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 |
|---|---|---|
| — | — | 5M-E |
| — | — | 5M-GE |