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Chevrolet L850 24L LEA 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. DOHC.
The Chevrolet L850 24L LEA 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 20 engines in the Ecotec family, sitting between the 61 ci and 150 ci members. Factory fitments include the Buick LaCrosse, Buick Regal, Chevrolet Equinox and 3 others.
| Displacement | 145 ci / 2.4 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 3.8583" |
| Cylinders | 4 |
| Compression ratio | 11.2:1 |
| Bore/stroke ratio | 0.898 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 182 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 | 11.2:1 — high enough that pump premium or better is normally required |
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