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Chevrolet Ecotec specs: 150 ci (2.5L) 4-cylinder, 3.465 x 4.00 in (88 x 101.6 mm) bore and stroke, 11.3:1 compression. Rated 193-202 hp. DOHC.
The Chevrolet Ecotec is undersquare — the 4" stroke exceeds the 3.4646" bore by 13.4% — a layout that trades peak RPM for leverage and torque low in the range. The 4" stroke puts mean piston speed at 4,000 ft/min around 6,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 37.5 ci (615 cc).
11.3:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 20 engines in the Ecotec family, the largest at 150 ci. 2 factory variants share these dimensions, rated from 193 to 202 hp. Factory fitments include the Chevrolet Malibu, Chevrolet Impala, Buick LaCrosse and 2 others.
| Displacement | 150 ci / 2.5 L |
|---|---|
| Bore | 3.4646" |
| Stroke | 4" |
| Cylinders | 4 |
| Compression ratio | 11.3:1 |
| Bore/stroke ratio | 0.866 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 193–202 hp |
| Bore/stroke character | 0.866 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,000 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 37.5 ci |
| Static compression | 11.3:1 — high enough that pump premium or better is normally required |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 193 hp | LCV |
| — | 202 hp | LKW |