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Volkswagen BRM specs: 1.9L (115.7 ci) 4-cylinder, 79.5 x 95.5 mm (3.1299 x 3.7598 in) bore and stroke, 19:1 compression. Used in the Volkswagen Jetta. SOHC.
The Volkswagen 1.9 TDI PD (BRM) is undersquare — the 3.7598" stroke exceeds the 3.1299" bore by 16.8% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7598" stroke puts mean piston speed at 4,000 ft/min around 6,400 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 28.9 ci (474 cc).
At 19:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
It is one of 6 engines in the 1.9 TDI PD family, all of them 115.7 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 115.7 ci / 1.9 L |
|---|---|
| Bore | 3.1299" |
| Stroke | 3.7598" |
| Cylinders | 4 |
| Compression ratio | 19:1 * |
| Bore/stroke ratio | 0.832 |
* Compression ratio from a single source; not yet cross-verified.
| Valvetrain | SOHC |
|---|---|
| Fuel type | diesel |
| Bore/stroke character | 0.832 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,760 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 28.9 ci |
| Static compression | 19:1 — high enough that pump premium or better is normally required |
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1 factory vehicle, 2005–2006. Each year opens that model's engine table.