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Chevrolet L61 specs: 134 ci (2.2L) 4-cylinder, 3.386 x 3.724 in (86 x 94.6 mm) bore and stroke, 10:1 compression. Rated 140-148 hp, 2002–2008.
The Chevrolet Ecotec (L61) is undersquare — the 3.7244" stroke exceeds the 3.3858" bore by 9.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7244" stroke puts mean piston speed at 4,000 ft/min around 6,450 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 33.5 ci (549 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 26 engines in the Ecotec family, sitting between the 61 ci and 150 ci members. 13 factory variants share these dimensions, rated from 140 to 148 hp across 2002–2008.
| Displacement | 134 ci / 2.2 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 3.7244" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.909 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 140–148 hp |
| Years | 2002–2008 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2003 | L61 net | 140 @ 5600 | 150 lb-ft @ 4000 | 10:1 |
| 2005 | L61 net | 145 @ 5600 | 155 lb-ft @ 4000 | 10:1 |
| 2006 | L61 net | 144 @ 5600 | 155 lb-ft @ 4000 | 10:1 |
Factory specification sheet.
| Bore/stroke character | 0.909 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,724 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 33.5 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 |
|---|---|---|
| 2002 | 140 hp | L61 |
| 2003 | 140 hp | L61 |
| 2004 | 140 hp | L61 |
| 2004 | 145 hp | L61 |
| 2005 | 140 hp | L61 |
| 2005 | 144 hp | L61 |
| 2005 | 145 hp | L61 |
| 2006 | 144 hp | L61 |
| 2006 | 145 hp | L61 |
| 2007 | 144 hp | L61 |
| 2007 | 148 hp | L61 |
| 2008 | 145 hp | L61 |
| 2008 | 148 hp | L61 |
6 factory vehicles, 2002–2008. Each year opens that model's engine table.