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Volkswagen 1_7 specs: 1.7L (104.7 ci) 4-cylinder, 79.5 x 86.4 mm (3.1299 x 3.4006 in) bore and stroke. Rod ratio and piston speed worked out.
The Volkswagen EA827 (1_7) is undersquare — the 3.4006" stroke exceeds the 3.1299" bore by 8.0% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4006" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 26.2 ci (429 cc).
It is one of 8 engines in the EA827 family, the smallest at 104.7 ci.
| Displacement | 104.7 ci / 1.7 L |
|---|---|
| Bore | 3.1299" |
| Stroke | 3.4006" |
| Cylinders | 4 |
| Bore/stroke ratio | 0.92 |
| Fuel type | gas |
|---|
| Bore/stroke character | 0.920 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,401 ft/min — conservative for a street engine |
| Displacement per cylinder | 26.2 ci |
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