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Volkswagen AEB / ATW; AWM specs: 1.8L (109 ci) 4-cylinder, 81 x 86.4 mm (3.1890 x 3.4016 in) bore and stroke, 9.5:1 compression. Rated 170 hp, 1998–2005.
The Volkswagen AEB / ATW; AWM is undersquare — the 3.4016" stroke exceeds the 3.189" bore by 6.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4016" 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 27.3 ci (447 cc).
9.5:1 is in the range that usually runs on pump premium.
It is one of 7 engines in the Volkswagen 109ci family, all of them 109 ci — the differences between them are in compression, heads and rating, not displacement. 8 factory variants share these dimensions, rated at 170 hp across 1998–2005.
| Displacement | 109 ci / 1.8 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.4016" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.5:1 * |
| Bore/stroke ratio | 0.938 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 170 hp |
| Years | 1998–2005 |
| Bore/stroke character | 0.938 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,402 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.3 ci |
| Static compression | 9.5:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| 1998 | — | AEB / ATW; AWM |
| 1999 | — | AEB / ATW; AWM |
| 2000 | — | AEB / ATW; AWM |
| 2001 | — | AEB / ATW; AWM |
| 2002 | — | AEB / ATW; AWM |
| 2003 | — | AEB / ATW; AWM |
| 2004 | — | AEB / ATW; AWM |
| 2005 | 170 hp | AEB / ATW; AWM |
1 factory vehicle, 1998–2005. Each year opens that model's engine table.