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Chevrolet LAP 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 155 hp, 2009–2010.
The Chevrolet Ecotec (LAP) 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. 2 factory variants share these dimensions, rated at 155 hp across 2009–2010.
| 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 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 155 hp |
| Years | 2009–2010 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2009 | LAP net | 155 @ 6100 * | 150 lb-ft @ 4800 * | — |
| 2010 | LAP net | 155 @ 6100 * | 150 lb-ft @ 4800 * | — |
Factory specification sheet. * Not yet cross-verified.
| 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 |
|---|---|---|
| 2009 | 155 hp | LAP |
| 2010 | 155 hp | LAP |
1 factory vehicle, 2009–2010. Each year opens that model's engine table.