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Porsche MCU.RA specs: 3.6L (220 ci) 6-cylinder, 96 x 83 mm (3.7795 x 3.2677 in) bore and stroke, 10.5:1 compression. Rated 420 hp, 2015–2018.
The Porsche MCU.RA is oversquare — the 3.7795" bore exceeds the 3.2677" stroke by 15.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.2677" stroke does not reach 4,000 ft/min of mean piston speed until about 7,350 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 36.7 ci (601 cc).
10.5:1 is in the range that usually runs on pump premium.
It is one of 3 engines in the Porsche 220ci family, all of them 220 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions, rated at 420 hp across 2015–2018.
| Displacement | 220 ci / 3.6 L |
|---|---|
| Bore | 3.7795" |
| Stroke | 3.2677" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.157 |
How to tell which you have: An MCU code is Porsche's own 3.6 twin-turbo V6 (Cayenne S, MCU.RA). The base Cayenne's 3.6 is a different, non-turbo VR6 (MCE.YA). The code is on the vehicle data label in the spare-wheel well and with the engine number on the crankcase.
| Fuel type | gas |
|---|---|
| Advertised HP | 420 hp |
| Years | 2015–2018 |
| Bore/stroke character | 1.157 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,268 ft/min — conservative for a street engine |
| Displacement per cylinder | 36.7 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| 2015 | 420 hp | MCU.RA |
| 2016 | 420 hp | MCU.RA |
| 2017 | 420 hp | MCU.RA |
| 2018 | 420 hp | MCU.RA |
1 factory vehicle, 2015–2018. Each year opens that model's engine table.