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Volkswagen 9A specs: 2.0L (121.1 ci) 4-cylinder, 82.5 x 92.8 mm (3.2480 x 3.6535 in) bore and stroke. Rated 134 hp, 1990–1993.
The Volkswagen EA827 (9A) is undersquare — the 3.6535" stroke exceeds the 3.248" bore by 11.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.6535" stroke puts mean piston speed at 4,000 ft/min around 6,550 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.3 ci (496 cc).
It is one of 8 engines in the EA827 family, the largest at 121.1 ci. 7 factory variants share these dimensions, rated at 134 hp across 1990–1993.
| Displacement | 121.1 ci / 2 L |
|---|---|
| Bore | 3.248" |
| Stroke | 3.6535" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.889 |
| Valvetrain | SOHC |
|---|---|
| Fuel type | gas |
| Advertised HP | 134 hp |
| Years | 1990–1993 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1990 | 9A net | 134 @ 5800 * | 133 lb-ft @ 4400 * | — |
| 1991 | 9A net | 134 @ 5800 * | 133 lb-ft @ 4400 * | — |
| 1992 | 9A net | 134 @ 5800 * | 133 lb-ft @ 4400 * | — |
Factory specification sheet. * Not yet cross-verified.
| Bore/stroke character | 0.889 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,654 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.3 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 |
|---|---|---|
| 1990 | — | 9A |
| 1990 | 134 hp | 9A |
| 1991 | — | 9A |
| 1991 | 134 hp | 9A |
| 1992 | — | 9A |
| 1992 | 134 hp | 9A |
| 1993 | — | 9A |
3 factory vehicles, 1990–1993. Each year opens that model's engine table.