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Porsche EA839 2.9TT specs: 2.9L (176.5 ci) 6-cylinder, 84.5 x 86 mm (3.3268 x 3.3858 in) bore and stroke, 10.5:1 compression. Rated 434 hp, 2019–2023.
The Porsche EA839 2.9TT is close to square: 3.3268" bore against 3.3858" stroke, within 1.7%, which splits the difference between a high-revving layout and a torque layout. The 3.3858" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 29.4 ci (482 cc).
10.5:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 3 engines in the EA839 family, the largest at 176.5 ci. 5 factory variants share these dimensions, rated at 434 hp across 2019–2023.
| Displacement | 176.5 ci / 2.9 L |
|---|---|
| Bore | 3.3268" |
| Stroke | 3.3858" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.983 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Redline | 6,800 rpm (factory limit) |
| Advertised HP | 434 hp |
| Years | 2019–2023 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2019 | EA839 2.9TT net | 434 @ 5700-6600 | 405 lb-ft @ 1800-5500 | 10.5:1 |
| 2020 | EA839 2.9TT net | 434 @ 5700-6600 | 405 lb-ft @ 1800-5500 | 10.5:1 |
| 2021 | EA839 2.9TT net | 434 @ 5700-6600 | 405 lb-ft @ 1800-5500 | 10.5:1 |
| 2022 | EA839 2.9TT net | 434 @ 5700-6600 | 405 lb-ft @ 1800-5500 | 10.5:1 |
| 2023 | EA839 2.9TT net | 434 @ 5700-6600 | 405 lb-ft @ 1800-5500 | 10.5:1 |
Factory specification sheet.
| Bore/stroke character | 0.983 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,386 ft/min — conservative for a street engine |
| Displacement per cylinder | 29.4 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 |
|---|---|---|
| 2019 | 434 hp | EA839 2.9TT |
| 2020 | 434 hp | EA839 2.9TT |
| 2021 | 434 hp | EA839 2.9TT |
| 2022 | 434 hp | EA839 2.9TT |
| 2023 | 434 hp | EA839 2.9TT |
1 factory vehicle, 2019–2023. Each year opens that model's engine table.