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Chevrolet LIH specs: 61 ci (1.0L) 3-cylinder, 2.913 x 3.047 in (74 x 77.4 mm) bore and stroke, 10.5:1 compression. Rated 105 hp. Rod ratio and piston speed.
The Chevrolet Ecotec (LIH) is close to square: 2.9134" bore against 3.0472" stroke, within 4.4%, which splits the difference between a high-revving layout and a torque layout. The 3.0472" stroke does not reach 4,000 ft/min of mean piston speed until about 7,900 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 3 cylinders displaces 20.3 ci (333 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, the smallest at 61 ci. Factory fitments include the Opel Adam, Opel Corsa E, Chevrolet Spark.
| Displacement | 61 ci / 1 L |
|---|---|
| Bore | 2.9134" |
| Stroke | 3.0472" |
| Cylinders | 3 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.956 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 105 hp |
| Bore/stroke character | 0.956 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,047 ft/min — conservative for a street engine |
| Displacement per cylinder | 20.3 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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