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Mazda 33 I6 specs: 3.3L (201.4 ci) 6-cylinder, 86 x 94.2 mm (3.3858 x 3.7087 in) bore and stroke, 12:1 compression. Rated 280 hp. Rod ratio and piston speed.
The Mazda 33 I6 is undersquare — the 3.7087" stroke exceeds the 3.3858" bore by 8.7% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7087" stroke puts mean piston speed at 4,000 ft/min around 6,450 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 33.6 ci (550 cc).
12:1 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 13 engines in the Skyactiv-G family, the largest at 201.4 ci. Factory fitments include the Mazda CX-90, CX-90, CX-70.
| Displacement | 201.4 ci / 3.3 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 3.7087" |
| Cylinders | 6 |
| Compression ratio | 12:1 |
| Bore/stroke ratio | 0.913 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 280 hp |
| Bore/stroke character | 0.913 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,709 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 33.6 ci |
| Static compression | 12:1 — high enough that pump premium or better is normally required |
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