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GMC LKV specs: 90.8 ci (1.5L) 4-cylinder, 2.913 x 3.409 in (74 x 86.6 mm) bore and stroke, 10:1 compression. Rated 163 hp. DOHC. Rod ratio and piston speed.
The GMC Ecotec I4 (LKV) is undersquare — the 3.4094" stroke exceeds the 2.9134" bore by 14.5% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4094" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 22.7 ci (372 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 6 engines in the Ecotec I4 family, sitting between the 83.2 ci and 145 ci members. Factory fitments include the Chevrolet Malibu, Buick Envision.
| Displacement | 90.8 ci / 1.5 L |
|---|---|
| Bore | 2.9134" |
| Stroke | 3.4094" |
| Cylinders | 4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.855 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 163 hp |
| Bore/stroke character | 0.855 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,409 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.7 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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