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Pontiac LN2 specs: 133 ci (2.2L) 4-cylinder, 3.504 x 3.465 in (89 x 88 mm) bore and stroke, 9:1 compression. Rated 120 hp, 1995–2002.
The Pontiac 133ci (LN2) is close to square: 3.5039" bore against 3.4646" stroke, within 1.1%, which splits the difference between a high-revving layout and a torque layout. The 3.4646" stroke puts mean piston speed at 4,000 ft/min around 6,950 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 33.3 ci (545 cc).
9:1 is low by modern standards and generally happy on regular pump fuel.
8 factory variants share these dimensions, rated at 120 hp across 1995–2002.
| Displacement | 133 ci / 2.2 L |
|---|---|
| Bore | 3.5039" |
| Stroke | 3.4646" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.011 |
| Fuel type | gas |
|---|---|
| Advertised HP | 120 hp |
| Years | 1995–2002 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1997 | LN2 net | 120 @ 5200 | 130 lb-ft @ 4000 | — |
Factory specification sheet.
| Bore/stroke character | 1.011 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,465 ft/min — conservative for a street engine |
| Displacement per cylinder | 33.3 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 1995 | 120 hp | LN2 |
| 1996 | 120 hp | LN2 |
| 1997 | 120 hp | LN2 |
| 1998 | 120 hp | LN2 |
| 1999 | — | LN2 |
| 2000 | — | LN2 |
| 2001 | — | LN2 |
| 2002 | — | LN2 |
10 factory vehicles, 1992–2003. Each year opens that model's engine table.