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Porsche MA1.02 specs: 3.6L (220.5 ci) 6-cylinder, 97 x 81.5 mm (3.8189 x 3.2087 in) bore and stroke, 12.5:1 compression. Rated 345 hp, 2009–2012.
The Porsche MA1.02 is oversquare — the 3.8189" bore exceeds the 3.2087" stroke by 19.0% — 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 36.8 ci (602 cc).
12.5:1 is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 14 engines in the MA1 family, sitting between the 165.1 ci and 231.9 ci members. 4 factory variants share these dimensions, rated at 345 hp across 2009–2012.
| Displacement | 220.5 ci / 3.6 L |
|---|---|
| Bore | 3.8189" |
| Stroke | 3.2087" |
| Cylinders | 6 |
| Compression ratio | 12.5:1 |
| Bore/stroke ratio | 1.19 |
| Fuel type | gas |
|---|---|
| Redline | 7,500 rpm (factory limit) |
| Advertised HP | 345 hp |
| Years | 2009–2012 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2009 | MA1.02 net | 345 @ 6500 | 288 lb-ft @ 4400 | 12.5:1 |
| 2010 | MA1.02 net | 345 @ 6500 | 288 lb-ft @ 4400 | 12.5:1 |
| 2011 | MA1.02 net | 345 @ 6500 | 288 lb-ft @ 4400 | 12.5:1 |
| 2012 | MA1.02 net | 345 @ 6500 | 288 lb-ft @ 4400 | 12.5:1 |
Factory specification sheet.
| Bore/stroke character | 1.190 — 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 | 36.8 ci |
| Static compression | 12.5:1 — high enough that pump premium or better is normally required |
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 |
|---|---|---|
| 2009 | 345 hp | MA1.02 |
| 2010 | 345 hp | MA1.02 |
| 2011 | 345 hp | MA1.02 |
| 2012 | 345 hp | MA1.02 |
1 factory vehicle, 2009–2012. Each year opens that model's engine table.