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Nissan SR20DE specs: 2.0L (121.9 ci) 4-cylinder, 86 x 86 mm (3.3858 x 3.3858 in) bore and stroke, 10:1 compression. Rated 140-145 hp, 1991–2001.
The Nissan SR20DE is exactly square — 3.3858" bore and 3.3858" stroke are the same — 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 4 cylinders displaces 30.5 ci (499 cc).
10:1 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 6 engines in the SR20 family, all of them 121.9 ci — the differences between them are in compression, heads and rating, not displacement. 11 factory variants share these dimensions, rated from 140 to 145 hp across 1991–2001.
| Displacement | 121.9 ci / 2 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 3.3858" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10:1 * |
| Bore/stroke ratio | 1 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Firing order | 1-3-4-2 |
| Advertised HP | 140–145 hp |
| Years | 1991–2001 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1998 | SR20DE net | 140 @ 6400 | 132 lb-ft @ 4800 | — |
| 1999 | SR20DE net | 140 @ 6400 | 132 lb-ft @ 4800 | — |
| 2000 | SR20DE net | 145 @ 6400 | 136 lb-ft @ 4800 | — |
| 2001 | SR20DE net | 145 @ 6400 | 136 lb-ft @ 4800 | — |
Factory specification sheet.
| Bore/stroke character | 1.000 — 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 | 30.5 ci |
| Static compression | 10:1 — 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 |
|---|---|---|
| 1991 | 140 hp | SR20DE |
| 1992 | 140 hp | SR20DE |
| 1993 | 140 hp | SR20DE |
| 1994 | 140 hp | SR20DE |
| 1995 | 140 hp | SR20DE |
| 1996 | 140 hp | SR20DE |
| 1997 | 140 hp | SR20DE |
| 1998 | 140 hp | SR20DE |
| 1999 | 140 hp | SR20DE |
| 2000 | 145 hp | SR20DE |
| 2001 | 145 hp | SR20DE |
3 factory vehicles, 1991–2001. Each year opens that model's engine table.