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Chevrolet LKW specs: 150 ci (2.5L) 4-cylinder, 3.465 x 4.00 in (88 x 101.6 mm) bore and stroke. Rated 196-197 hp, 2014–2019. Used in the Chevrolet Impala.
The Chevrolet Ecotec (LKW) is undersquare — the 4" stroke exceeds the 3.4646" bore by 13.4% — a layout that trades peak RPM for leverage and torque low in the range. The 4" stroke puts mean piston speed at 4,000 ft/min around 6,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 37.5 ci (615 cc).
It is one of 20 engines in the Ecotec family, the largest at 150 ci. 6 factory variants share these dimensions, rated from 196 to 197 hp across 2014–2019.
| Displacement | 150 ci / 2.5 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 4" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.866 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 196–197 hp |
| Years | 2014–2019 |
| Bore/stroke character | 0.866 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,000 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 37.5 ci |
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 |
|---|---|---|
| 2014 | 196 hp | LKW |
| 2015 | 196 hp | LKW |
| 2016 | 196 hp | LKW |
| 2017 | 197 hp | LKW |
| 2018 | 197 hp | LKW |
| 2019 | 197 hp | LKW |