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Lexus M20A-FKS specs: 2.0L (121.9 ci) 4-cylinder, 80.5 x 97.6 mm (3.1693 x 3.8425 in) bore and stroke, 13:1 compression. Rated 169 hp. DOHC.
The Lexus M20A-FKS is undersquare — the 3.8425" stroke exceeds the 3.1693" bore by 17.5% — a layout that trades peak RPM for leverage and torque low in the range. The 3.8425" stroke puts mean piston speed at 4,000 ft/min around 6,250 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.5 ci (499 cc).
13:1 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.
It is one of 15 engines in the Dynamic Force family, the smallest at 121.9 ci. Factory fitments include the Lexus UX 200, Toyota Corolla, Toyota C-HR.
| Displacement | 121.9 ci / 2 L |
|---|---|
| Bore | 3.1693" |
| Stroke | 3.8425" |
| Cylinders | 4 |
| Compression ratio | 13:1 |
| Bore/stroke ratio | 0.825 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 169 hp |
| Bore/stroke character | 0.825 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,843 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 ci |
| Static compression | 13:1 — high enough that pump premium or better is normally required |
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