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Saturn LAF specs: 145 ci (2.4L) 4-cylinder, 3.465 x 3.858 in (88 x 98 mm) bore and stroke, 11.2:1 compression. Rated 164 hp. DOHC. Rod ratio and piston speed.
The Saturn GM Ecotec (LAF) is undersquare — the 3.8583" stroke exceeds the 3.4646" bore by 10.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.8583" stroke puts mean piston speed at 4,000 ft/min around 6,200 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 36.3 ci (594 cc).
11.2:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 5 engines in the GM Ecotec family, the largest at 145 ci. Factory fitments include the Saturn Aura Green Line, Saturn Vue Green Line.
| Displacement | 145 ci / 2.4 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 3.8583" |
| Cylinders | 4 |
| Compression ratio | 11.2:1 |
| Bore/stroke ratio | 0.898 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 164 hp |
| Bore/stroke character | 0.898 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,858 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 36.3 ci |
| Static compression | 11.2:1 — high enough that pump premium or better is normally required |
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