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Chevrolet LM3 specs: 133 ci (2.2L) 4-cylinder, 3.50 x 3.46 in (88.9 x 87.9 mm) bore and stroke. Rated 95 hp, 1990–1991. Used in the Chevrolet Beretta.
The Chevrolet 133ci (LM3) is close to square: 3.5" bore against 3.46" stroke, within 1.2%, which splits the difference between a high-revving layout and a torque layout. The 3.46" 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).
It is one of 2 engines in the Chevrolet 133ci family, all of them 133 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions, rated at 95 hp across 1990–1991.
| Displacement | 133 ci / 2.2 L |
|---|---|
| Bore | 3.5" |
| Stroke | 3.46" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.85–9:1 (published figures vary) |
| Bore/stroke ratio | 1.012 |
| Fuel type | gas |
|---|---|
| Advertised HP | 95 hp |
| Years | 1990–1991 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1990 | LM3 net | 95 @ 5200 | 120 lb-ft @ 3200 | 9:1 |
| 1991 | LM3 net | 95 @ 5200 | 120 lb-ft @ 3200 | 8.85:1 |
Factory specification sheet.
| Bore/stroke character | 1.012 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,460 ft/min — conservative for a street engine |
| Displacement per cylinder | 33.3 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 |
|---|---|---|
| 1990 | 95 hp | LM3 |
| 1991 | 95 hp | LM3 |
3 factory vehicles, 1990–1991. Each year opens that model's engine table.