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Chevrolet LUW 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 136-138 hp, 2011–2018.
The Chevrolet Ecotec (LUW) 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 26 engines in the Ecotec family, sitting between the 61 ci and 150 ci members. 8 factory variants share these dimensions, rated from 136 to 138 hp across 2011–2018.
| Displacement | 110 ci / 1.8 L |
|---|---|
| Bore | 3.1693" |
| Stroke | 3.4724" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10.5:1 * |
| Bore/stroke ratio | 0.913 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 136–138 hp |
| Years | 2011–2018 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2012 | LUW | 138 @ 6300 | 123 lb-ft @ 3800 | — |
| 2013 | LUW | 138 @ 6300 | 123 lb-ft @ 3800 | — |
| 2014 | LUW | 138 @ 6300 | 123 lb-ft @ 3800 | — |
| 2015 | LUW | 138 @ 6300 | 123 lb-ft @ 3800 | — |
| 2016 | LUW | 138 @ 6300 | 123 lb-ft @ 3800 | — |
| 2017 | LUW | 138 @ 6300 | 125 lb-ft @ 3800 | — |
| 2018 | LUW | 138 @ 6300 | 125 lb-ft @ 3800 | — |
Factory specification sheet.
| 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 |
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 |
|---|---|---|
| 2011 | 136 hp | LUW |
| 2012 | 138 hp | LUW |
| 2013 | 138 hp | LUW |
| 2014 | 138 hp | LUW |
| 2015 | 138 hp | LUW |
| 2016 | 138 hp | LUW |
| 2017 | 138 hp | LUW |
| 2018 | 138 hp | LUW |
2 factory vehicles, 2011–2018. Each year opens that model's engine table.