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Toyota 4M specs: 2.6L (156 ci) 6-cylinder, 80 x 85 mm (3.1496 x 3.3465 in) bore and stroke. Built 1978. Used in the Toyota Cressida.
The Toyota 156ci (4M) is undersquare — the 3.3465" stroke exceeds the 3.1496" bore by 5.9% — a layout that trades peak RPM for leverage and torque low in the range. 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 26.0 ci (426 cc).
It is one of 2 engines in the Toyota 156ci family, all of them 156 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 156 ci / 2.6 L |
|---|---|
| Bore | 3.1496" |
| Stroke | 3.3465" |
| Cylinders | 6 |
| Configuration | I6 |
| Bore/stroke ratio | 0.941 |
| Fuel type | gas |
|---|---|
| Years | 1978 |
| Bore/stroke character | 0.941 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,347 ft/min — conservative for a street engine |
| Displacement per cylinder | 26.0 ci |
Each link opens the calculator with this engine's specs already filled in.
1 factory vehicle, 1978. Each year opens that model's engine table.