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Nissan KR20DDET specs: 2.0L (122 ci) 4-cylinder, 84 x 90.1 mm (3.3071 x 3.5472 in) bore and stroke. Rated 241-248 hp, 2019–2026. Used in the Nissan Altima.
The Nissan KR20DDET is undersquare — the 3.5472" stroke exceeds the 3.3071" bore by 6.8% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5472" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.5 ci (500 cc).
It is one of 6 engines in the Nissan 122ci family, all of them 122 ci — the differences between them are in compression, heads and rating, not displacement. 8 factory variants share these dimensions, rated from 241 to 248 hp across 2019–2026.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.3071" |
| Stroke | 3.5472" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8–14:1 (published figures vary) |
| Bore/stroke ratio | 0.932 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 241–248 hp |
| Years | 2019–2026 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2019 | KR20DDET net | 248 @ 5600 | 273 lb-ft @ 1600 | — |
| 2020 | KR20DDET net | 248 @ 5600 | 273 lb-ft @ 1600 | — |
| 2021 | KR20DDET net | 248 @ 5600 | 273 lb-ft @ 1600 | — |
| 2022 | KR20DDET net | 248 @ 5600 | 273 lb-ft @ 1600 | — |
| 2023 | KR20DDET net | 248 @ 5600 | 273 lb-ft @ 1600 | — |
| 2024 | KR20DDET net | 248 @ 5600 | 273 lb-ft @ 1600 | — |
| 2025 | KR20DDET net | 241 @ 5600 | 260 lb-ft @ 4400 | — |
| 2026 | KR20DDET net | 241 @ 5600 | 260 lb-ft @ 4400 | — |
Factory specification sheet.
| Bore/stroke character | 0.932 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,547 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 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 |
|---|---|---|
| 2019 | 248 hp | KR20DDET |
| 2020 | 248 hp | KR20DDET |
| 2021 | 248 hp | KR20DDET |
| 2022 | 248 hp | KR20DDET |
| 2023 | 248 hp | KR20DDET |
| 2024 | 248 hp | KR20DDET |
| 2025 | 241 hp | KR20DDET |
| 2026 | 241 hp | KR20DDET |
2 factory vehicles, 2019–2026. Each year opens that model's engine table.