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Chevrolet Small GAS Engine 18L LWE specs: 110 ci (1.8L) 4-cylinder, 3.169 x 3.472 in (80.5 x 88.2 mm) bore and stroke, 10.5:1 compression. Rated 138 hp. DOHC.
The Chevrolet Small GAS Engine 18L LWE is undersquare — the 3.4724" stroke exceeds the 3.1693" bore by 8.7% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4724" stroke puts mean piston speed at 4,000 ft/min around 6,900 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 27.5 ci (451 cc).
10.5:1 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 Cruze, Chevrolet Sonic, Chevrolet Trax and 1 other.
| Displacement | 110 ci / 1.8 L |
|---|---|
| Bore | 3.1693" |
| Stroke | 3.4724" |
| Cylinders | 4 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.913 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 138 hp |
| Bore/stroke character | 0.913 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,472 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.5 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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