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The same engine also has a main page: Saturn I4 9.5:1.
Saturn LK0 specs: 116 ci (1.9L) 4-cylinder, 3.228 x 3.543 in (82 x 90 mm) bore and stroke, 9.5:1 compression. Rated 124 hp. DOHC. Rod ratio and piston speed.
The Saturn S-Series (LK0) is undersquare — the 3.5433" stroke exceeds the 3.2283" bore by 8.9% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5433" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 29.0 ci (475 cc).
9.5:1 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 2 engines in the Saturn S-Series family, all of them 116 ci — the differences between them are in compression, heads and rating, not displacement. Factory fitments include the Saturn SL2, Saturn SC2, Saturn SW2.
| Displacement | 116 ci / 1.9 L |
|---|---|
| Bore | 3.2283" |
| Stroke | 3.5433" |
| Cylinders | 4 |
| Compression ratio | 9.5:1 |
| Bore/stroke ratio | 0.911 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 124 hp |
| Bore/stroke character | 0.911 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,543 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 29.0 ci |
| Static compression | 9.5:1 — in the range that usually runs on pump premium |
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