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Lexus 3MZ-FE (Hybrid) specs: 3.3L (202 ci) 6-cylinder, 92 x 83 mm (3.6220 x 3.2677 in) bore and stroke, 10.8:1 compression. Rated 208 hp. DOHC.
The Lexus 3MZ-FE (Hybrid) is oversquare — the 3.622" bore exceeds the 3.2677" stroke by 10.8% — a layout that favors airflow and RPM over leverage at the crank. The 3.2677" 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 6 cylinders displaces 33.7 ci (552 cc).
10.8:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
Factory fitments include the Lexus RX 400h.
| Displacement | 202 ci / 3.3 L |
|---|---|
| Bore | 3.622" |
| Stroke | 3.2677" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 10.8:1 |
| Bore/stroke ratio | 1.108 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 208 hp |
| Bore/stroke character | 1.108 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,268 ft/min — conservative for a street engine |
| Displacement per cylinder | 33.7 ci |
| Static compression | 10.8:1 — in the range that usually runs on pump premium |
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