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Chevrolet LE5 specs: 145 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. Rod ratio and piston speed.
The Chevrolet Ecotec (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 36.3 ci (594 cc).
10.4:1 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 20 engines in the Ecotec family, sitting between the 61 ci and 150 ci members. Factory fitments include the Chevrolet Cobalt SS, Chevrolet HHR, Pontiac G5 GT and 5 others.
| Displacement | 145 ci / 2.4 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 3.8583" |
| Cylinders | 4 |
| Compression ratio | 10.4:1 |
| Bore/stroke ratio | 0.898 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 177 hp |
| 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 | 10.4:1 — in the range that usually runs on pump premium |
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