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Volkswagen EH/FX (1.5 gas) specs: 1.5L (89 ci) 4-cylinder, 79.5 x 73.4 mm (3.1299 x 2.8898 in) bore and stroke. Rated 71 hp, 1978–1979.
The Volkswagen EH/FX (1.5 gas) is oversquare — the 3.1299" bore exceeds the 2.8898" stroke by 8.3% — a layout that favors airflow and RPM over leverage at the crank. The 2.8898" stroke does not reach 4,000 ft/min of mean piston speed until about 8,300 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 22.3 ci (365 cc).
2 factory variants share these dimensions, rated at 71 hp across 1978–1979.
| Displacement | 89 ci / 1.5 L |
|---|---|
| Bore | 3.1299" * |
| Stroke | 2.8898" * |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 1.083 |
* Bore and stroke from a single source; not yet cross-verified.
How to tell which you have: Gasoline engine; engine code EH or FX stamped on the block pad beside the distributor means the 1,457 cc 1.5 (79.5 mm bore, short 73.4 mm stroke).
| Fuel type | gas |
|---|---|
| Advertised HP | 71 hp |
| Years | 1978–1979 |
| Bore/stroke character | 1.083 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,890 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.3 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 |
|---|---|---|
| 1978 | 71 hp | EH/FX (1.5 gas) |
| 1979 | 71 hp | EH/FX (1.5 gas) |
1 factory vehicle, 1978–1979. Each year opens that model's engine table.