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Lincoln 20 Hybrid I4 specs: 122 ci (2.0L) 4-cylinder, 3.445 x 3.272 in (87.5 x 83.1 mm) bore and stroke, 12.3:1 compression. Rated 141 hp. DOHC.
The Lincoln 20 Hybrid I4 is oversquare — the 3.4449" bore exceeds the 3.2717" stroke by 5.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.2717" stroke does not reach 4,000 ft/min of mean piston speed until about 7,350 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 30.5 ci (500 cc).
12.3:1 on aluminum heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
Factory fitments include the Lincoln MKZ Hybrid, Lincoln Corsair Hybrid.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.2717" |
| Cylinders | 4 |
| Compression ratio | 12.3:1 |
| Bore/stroke ratio | 1.053 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 141 hp |
| Bore/stroke character | 1.053 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,272 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 ci |
| Static compression | 12.3:1 — high enough that pump premium or better is normally required |
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