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Pontiac L46 specs: 112 ci (1.8L) 4-cylinder, 3.50 x 2.91 in (88.9 x 73.9 mm) bore and stroke, 9:1 compression. Built 1982. Used in the Pontiac Sunbird.
The Pontiac 112ci (L46) is oversquare — the 3.5" bore exceeds the 2.91" stroke by 20.3% — a layout that favors airflow and RPM over leverage at the crank. The 2.91" stroke does not reach 4,000 ft/min of mean piston speed until about 8,250 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 28.0 ci (459 cc).
9:1 is low by modern standards and generally happy on regular pump fuel.
| Displacement | 112 ci / 1.8 L |
|---|---|
| Bore | 3.5" |
| Stroke | 2.91" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.203 |
| Fuel type | gas |
|---|---|
| Years | 1982 |
| Bore/stroke character | 1.203 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,910 ft/min — conservative for a street engine |
| Displacement per cylinder | 28.0 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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2 factory vehicles, 1982. Each year opens that model's engine table.