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GMC LAF specs: 145 ci (2.4L) 4-cylinder, 3.465 x 3.858 in (88 x 98 mm) bore and stroke. Rated 182 hp, 2010–2011. Used in the GMC Terrain. DOHC.
The GMC 145ci (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).
It is one of 2 engines in the GMC 145ci family, all of them 145 ci — the differences between them are in compression, heads and rating, not displacement. 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 |
| Bore/stroke ratio | 0.898 |
| 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 |
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 |
1 factory vehicle, 2010–2011. Each year opens that model's engine table.