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Pontiac LE5 specs: 146 ci (2.4L) 4-cylinder, 3.465 x 3.858 in (88 x 98 mm) bore and stroke, 10.4:1 compression. Rated 177 hp, 2006–2009.
The Pontiac 146ci (LE5) 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 36.5 ci (598 cc).
10.4:1 is in the range that usually runs on pump premium.
It is one of 2 engines in the Pontiac 146ci family, all of them 146 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions, rated at 177 hp across 2006–2009.
| Displacement | 146 ci / 2.4 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 3.8583" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10.4:1 * |
| Bore/stroke ratio | 0.898 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 177 hp |
| Years | 2006–2009 |
| 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 | 36.5 ci |
| Static compression | 10.4:1 — 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 |
|---|---|---|
| 2006 | 177 hp | LE5 |
| 2007 | 177 hp | LE5 |
| 2008 | 177 hp | LE5 |
| 2009 | 177 hp | LE5 |
3 factory vehicles, 2006–2011. Each year opens that model's engine table.