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Chevrolet L3T specs: 79 ci (1.3L) 3-cylinder, 3.11 x 3.465 in (79 x 88 mm) bore and stroke, 10:1 compression. Rated 155 hp. DOHC. Rod ratio and piston speed.
The Chevrolet Ecotec (L3T) is undersquare — the 3.4646" stroke exceeds the 3.1102" bore by 10.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4646" stroke puts mean piston speed at 4,000 ft/min around 6,950 RPM, which is where a production bottom end is generally considered at its limit. Each of the 3 cylinders displaces 26.3 ci (432 cc).
10:1 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 Trailblazer, Buick Encore GX, Chevrolet Trax.
| Displacement | 79 ci / 1.3 L |
|---|---|
| Bore | 3.1102" |
| Stroke | 3.4646" |
| Cylinders | 3 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.898 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 155 hp |
| Bore/stroke character | 0.898 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,465 ft/min — conservative for a street engine |
| Displacement per cylinder | 26.3 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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