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Porsche MA2.75 specs: 4.0L (244.1 ci) 6-cylinder, 102 x 81.5 mm (4.0157 x 3.2087 in) bore and stroke. Rated 502-518 hp, 2022–2026. Used in the Porsche 911.
The Porsche MA2.75 is oversquare — the 4.0157" bore exceeds the 3.2087" stroke by 25.2% — a layout that favors airflow and RPM over leverage at the crank. The 3.2087" stroke does not reach 4,000 ft/min of mean piston speed until about 7,500 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 40.7 ci (667 cc).
It is one of 4 engines in the 9A1 family, the largest at 244.1 ci. 8 factory variants share these dimensions, rated from 502 to 518 hp across 2022–2026.
| Displacement | 244.1 ci / 4 L |
|---|---|
| Bore | 4.0157" |
| Stroke | 3.2087" |
| Cylinders | 6 |
| Bore/stroke ratio | 1.252 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 502–518 hp |
| Years | 2022–2026 |
| Bore/stroke character | 1.252 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,209 ft/min — conservative for a street engine |
| Displacement per cylinder | 40.7 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 |
|---|---|---|
| 2022 | 502 hp | MA2.75 |
| 2023 | 502 hp | MA2.75 |
| 2023 | 518 hp | MA2.75 |
| 2024 | 502 hp | MA2.75 |
| 2024 | 518 hp | MA2.75 |
| 2025 | 502 hp | MA2.75 |
| 2025 | 518 hp | MA2.75 |
| 2026 | 502 hp | MA2.75 |