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Porsche 616/15 specs: 1.6L (96.5 ci) 4-cylinder, 82.5 x 74 mm (3.2480 x 2.9134 in) bore and stroke, 8.5:1 compression. Rated 75 hp, 1964–1965.
The Porsche 616/15 is oversquare — the 3.248" bore exceeds the 2.9134" stroke by 11.5% — a layout that favors airflow and RPM over leverage at the crank. The 2.9134" stroke does not reach 4,000 ft/min of mean piston speed until about 8,250 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.1 ci (395 cc).
8.5:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 7 engines in the Type 616 family, all of them 96.5 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions, rated at 75 hp across 1964–1965.
| Displacement | 96.5 ci / 1.6 L |
|---|---|
| Bore | 3.248" |
| Stroke | 2.9134" |
| Cylinders | 4 |
| Compression ratio | 8.5:1 * |
| Bore/stroke ratio | 1.115 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 75 hp |
| Years | 1964–1965 |
| Bore/stroke character | 1.115 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,913 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.1 ci |
| Static compression | 8.5:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 1964 | 75 hp | 616/15 |
| 1965 | 75 hp | 616/15 |
1 factory vehicle, 1964–1965. Each year opens that model's engine table.