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Chevrolet LAF specs: 145 ci (2.4L) 4-cylinder, 3.465 x 3.858 in (88 x 98 mm) bore and stroke, 11.2:1 compression. Rated 182 hp, 2010–2011.
The Chevrolet Ecotec (LAF) is undersquare — the 3.8583" stroke exceeds the 3.4646" bore by 10.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.8583" stroke puts mean piston speed at 4,000 ft/min around 6,200 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 36.3 ci (594 cc).
11.2:1 on aluminum heads is high enough that pump premium or better is normally required.
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 182 hp across 2010–2011.
| Displacement | 145 ci / 2.4 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 3.8583" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 11.2:1 * |
| Bore/stroke ratio | 0.898 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 182 hp |
| Years | 2010–2011 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2011 | LAF net | 182 @ 6700 * | 172 lb-ft @ 4900 * | — |
Factory specification sheet. * Not yet cross-verified.
| Bore/stroke character | 0.898 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,858 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 36.3 ci |
| Static compression | 11.2:1 — high enough that pump premium or better is normally required |
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 |
|---|---|---|
| 2010 | 182 hp | LAF |
| 2011 | 182 hp | LAF |
2 factory vehicles, 2010–2011. Each year opens that model's engine table.