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Mazda B6-ZE specs: 1.6L (97 ci) 4-cylinder, 78 x 83.6 mm (3.0709 x 3.2913 in) bore and stroke, 9.4:1 compression. Rated 115 hp. Rod ratio and piston speed.
The Mazda B6-ZE is undersquare — the 3.2913" stroke exceeds the 3.0709" bore by 6.7% — a layout that trades peak RPM for leverage and torque low in the range. The 3.2913" stroke does not reach 4,000 ft/min of mean piston speed until about 7,300 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.3 ci (397 cc).
9.4:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 14 engines in the B-Series family, the smallest at 97 ci. Factory fitments include the MX-5 Miata NA, 323, MX-3.
| Displacement | 97 ci / 1.6 L |
|---|---|
| Bore | 3.0709" |
| Stroke | 3.2913" |
| Cylinders | 4 |
| Compression ratio | 9.4:1 |
| Bore/stroke ratio | 0.933 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 115 hp |
| Bore/stroke character | 0.933 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,291 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.3 ci |
| Static compression | 9.4:1 — low by modern standards, generally happy on regular pump fuel |
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