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GMC LUV specs: 83.2 ci (1.4L) 4-cylinder, 2.854 x 3.252 in (72.5 x 82.6 mm) bore and stroke, 9.5:1 compression. Rated 138 hp. Rod ratio and piston speed.
The GMC Ecotec I4 (LUV) is undersquare — the 3.252" stroke exceeds the 2.8543" bore by 12.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.252" stroke does not reach 4,000 ft/min of mean piston speed until about 7,400 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 20.8 ci (341 cc).
Static compression of 9.5:1 on aluminum heads is moderate for the displacement, which is deliberate on a boosted engine — the turbo supplies the rest of the effective ratio, and static compression plus boost together set the fuel requirement.
It is one of 6 engines in the Ecotec I4 family, the smallest at 83.2 ci. Factory fitments include the Chevrolet Cruze, Buick Encore, Chevrolet Sonic.
| Displacement | 83.2 ci / 1.4 L |
|---|---|
| Bore | 2.8543" |
| Stroke | 3.252" |
| Cylinders | 4 |
| Compression ratio | 9.5:1 |
| Bore/stroke ratio | 0.878 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Induction | turbocharged |
| Fuel type | gas |
| Advertised HP | 138 hp |
| Bore/stroke character | 0.878 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,252 ft/min — conservative for a street engine |
| Displacement per cylinder | 20.8 ci |
| Static compression | 9.5:1 — in the range that usually runs on pump premium |
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